def train_faster_rcnn_e2e(cfg):
# Input variables denoting features and labeled ground truth rois (as 5-tuples per roi)
image_input = input_variable(shape=(cfg.NUM_CHANNELS, cfg.IMAGE_HEIGHT, cfg.IMAGE_WIDTH),
dynamic_axes=[Axis.default_batch_axis()],
name=cfg["MODEL"].FEATURE_NODE_NAME)
roi_input = input_variable((cfg.INPUT_ROIS_PER_IMAGE, 5), dynamic_axes=[Axis.default_batch_axis()])
dims_input = input_variable((6), dynamic_axes=[Axis.default_batch_axis()])
dims_node = alias(dims_input, name='dims_input')
# Instantiate the Faster R-CNN prediction model and loss function
loss, pred_error = create_faster_rcnn_model(image_input, roi_input, dims_node, cfg)
if cfg["CNTK"].DEBUG_OUTPUT:
print("Storing graphs and models to %s." % cfg.OUTPUT_PATH)
plot(loss, os.path.join(cfg.OUTPUT_PATH, "graph_frcn_train_e2e." + cfg["CNTK"].GRAPH_TYPE))
# Set learning parameters
e2e_lr_factor = cfg["MODEL"].E2E_LR_FACTOR
e2e_lr_per_sample_scaled = [x * e2e_lr_factor for x in cfg["CNTK"].E2E_LR_PER_SAMPLE]
mm_schedule = momentum_schedule(cfg["CNTK"].MOMENTUM_PER_MB)
print("Using base model: {}".format(cfg["MODEL"].BASE_MODEL))
print("lr_per_sample: {}".format(e2e_lr_per_sample_scaled))
train_model(image_input, roi_input, dims_input, loss, pred_error,
e2e_lr_per_sample_scaled, mm_schedule, cfg["CNTK"].L2_REG_WEIGHT, cfg["CNTK"].E2E_MAX_EPOCHS, cfg)
return create_faster_rcnn_eval_model(loss, image_input, dims_input, cfg)
def train_faster_rcnn_e2e(base_model_file_name, debug_output=False):
# Input variables denoting features and labeled ground truth rois (as 5-tuples per roi)
image_input = input_variable((num_channels, image_height, image_width), dynamic_axes=[Axis.default_batch_axis()], name=feature_node_name)
roi_input = input_variable((cfg["CNTK"].INPUT_ROIS_PER_IMAGE, 5), dynamic_axes=[Axis.default_batch_axis()])
dims_input = input_variable((6), dynamic_axes=[Axis.default_batch_axis()])
dims_node = alias(dims_input, name='dims_input')
# Instantiate the Faster R-CNN prediction model and loss function
loss, pred_error = create_faster_rcnn_predictor(base_model_file_name, image_input, roi_input, dims_node)
if debug_output:
print("Storing graphs and models to %s." % globalvars['output_path'])
plot(loss, os.path.join(globalvars['output_path'], "graph_frcn_train_e2e." + cfg["CNTK"].GRAPH_TYPE))
# Set learning parameters
e2e_lr_factor = globalvars['e2e_lr_factor']
e2e_lr_per_sample_scaled = [x * e2e_lr_factor for x in cfg["CNTK"].E2E_LR_PER_SAMPLE]
mm_schedule = momentum_schedule(cfg["CNTK"].MOMENTUM_PER_MB)
print("Using base model: {}".format(cfg["CNTK"].BASE_MODEL))
print("lr_per_sample: {}".format(e2e_lr_per_sample_scaled))
train_model(image_input, roi_input, dims_input, loss, pred_error,
e2e_lr_per_sample_scaled, mm_schedule, cfg["CNTK"].L2_REG_WEIGHT, globalvars['e2e_epochs'])
return create_eval_model(loss, image_input, dims_input)
def __init__(self, eval_model, cfg):
# load model once in constructor and push images through the model in 'process_image()'
self._img_shape = (cfg.NUM_CHANNELS, cfg.IMAGE_HEIGHT, cfg.IMAGE_WIDTH)
image_input = input_variable(shape=self._img_shape,
dynamic_axes=[Axis.default_batch_axis()],
name=cfg["MODEL"].FEATURE_NODE_NAME)
dims_input = input_variable((1,6), dynamic_axes=[Axis.default_batch_axis()], name='dims_input')
self._eval_model = eval_model(image_input, dims_input)
def __init__(self, eval_model, cfg):
# load model once in constructor and push images through the model in 'process_image()'
self._img_shape = (cfg.NUM_CHANNELS, cfg.IMAGE_HEIGHT, cfg.IMAGE_WIDTH)
image_input = input_variable(shape=self._img_shape,
dynamic_axes=[Axis.default_batch_axis()],
name=cfg["MODEL"].FEATURE_NODE_NAME)
roi_proposals = input_variable((cfg.NUM_ROI_PROPOSALS, 4), dynamic_axes=[Axis.default_batch_axis()],
name="roi_proposals")
self._eval_model = eval_model(image_input, roi_proposals)
self._cfg = cfg
def eval_and_plot_faster_rcnn(eval_model, num_images_to_plot, test_map_file, img_shape,
results_base_path, feature_node_name, classes,
drawUnregressedRois=False, drawNegativeRois=False,
nmsThreshold=0.5, nmsConfThreshold=0.0, bgrPlotThreshold = 0.8):
# get image paths
with open(test_map_file) as f:
content = f.readlines()
img_base_path = os.path.dirname(os.path.abspath(test_map_file))
img_file_names = [os.path.join(img_base_path, x.split('\t')[1]) for x in content]
# prepare model
image_input = input_variable(img_shape, dynamic_axes=[Axis.default_batch_axis()], name=feature_node_name)
dims_input = input_variable((1,6), dynamic_axes=[Axis.default_batch_axis()], name='dims_input')
frcn_eval = eval_model(image_input, dims_input)
#dims_input_const = cntk.constant([image_width, image_height, image_width, image_height, image_width, image_height], (1, 6))
print("Plotting results from Faster R-CNN model for %s images." % num_images_to_plot)
for i in range(0, num_images_to_plot):
imgPath = img_file_names[i]
# evaluate single image
_, cntk_img_input, dims = load_resize_and_pad(imgPath, img_shape[2], img_shape[1])
dims_input = np.array(dims, dtype=np.float32)
dims_input.shape = (1,) + dims_input.shape
output = frcn_eval.eval({frcn_eval.arguments[0]: [cntk_img_input], frcn_eval.arguments[1]: dims_input})
out_dict = dict([(k.name, k) for k in output])
out_cls_pred = output[out_dict['cls_pred']][0]
out_rpn_rois = output[out_dict['rpn_rois']][0]
out_bbox_regr = output[out_dict['bbox_regr']][0]
labels = out_cls_pred.argmax(axis=1)
scores = out_cls_pred.max(axis=1).tolist()
if drawUnregressedRois:
# plot results without final regression
imgDebug = visualizeResultsFaster(imgPath, labels, scores, out_rpn_rois, img_shape[2], img_shape[1],
classes, nmsKeepIndices=None, boDrawNegativeRois=drawNegativeRois,
decisionThreshold=bgrPlotThreshold)
imsave("{}/{}_{}".format(results_base_path, i, os.path.basename(imgPath)), imgDebug)
# apply regression and nms to bbox coordinates
regressed_rois = regress_rois(out_rpn_rois, out_bbox_regr, labels, dims)
nmsKeepIndices = apply_nms_to_single_image_results(regressed_rois, labels, scores,
nms_threshold=nmsThreshold,
conf_threshold=nmsConfThreshold)
img = visualizeResultsFaster(imgPath, labels, scores, regressed_rois, img_shape[2], img_shape[1],
classes, nmsKeepIndices=nmsKeepIndices,
boDrawNegativeRois=drawNegativeRois,
decisionThreshold=bgrPlotThreshold)
imsave("{}/{}_regr_{}".format(results_base_path, i, os.path.basename(imgPath)), img)
def test_op_reduce_over_batch_axis(input_data, device_id, precision):
from .. import reduce_sum, reduce_max, reduce_min, reduce_mean, reduce_log_sum_exp, reduce_prod
from cntk import Axis
dt = PRECISION_TO_TYPE[precision]
data = AA(input_data, dtype=dt)
a = C.input_variable(shape=data.shape[1:],
dtype=sanitize_dtype_cntk(dt),
needs_gradient=True,
name='a')
ops = [
(reduce_sum, lambda x:np.sum(x, axis=0, keepdims=False), lambda x,f:np.ones_like(x)),
(reduce_max, lambda x:np.amax(x, axis=0, keepdims=False), lambda x,f:min_max_bwd(x,f, dt)),
(reduce_min, lambda x:np.amin(x, axis=0, keepdims=False), lambda x,f:min_max_bwd(x,f, dt)),
(reduce_mean, lambda x:np.mean(x, axis=0, keepdims=False), lambda x,f:np.ones_like(x)/x.shape[0]),
(reduce_log_sum_exp, lambda x:np.log(np.sum(np.exp(x), axis=0, keepdims=False)), lambda x,f:np.exp(x-f)),
(reduce_prod, lambda x:np.prod(x, axis=0, keepdims=False), lambda x,f:f / x)
]
for op,fwd,bwd in ops:
input_op = op(a, axis=Axis.default_batch_axis())
expected_forward = fwd(data)
expected_backward = bwd(data, expected_forward)
binding = {a: data}
actual_backward = input_op.grad(binding)
actual_forward = input_op.eval(binding)
assert np.allclose(actual_forward, expected_forward)
for ab,eb in zip (actual_backward, expected_backward):
assert np.allclose(ab, eb)
def test_model_not_criterion_subset():
input_dim = 2
proj_dim = 11
model1_dim = 3
model2_dim = 4
x = input_variable((input_dim,))
core = Embedding(proj_dim)
model1 = Dense(model1_dim)(sequence.last(core(x)))
model1_label = input_variable((model1_dim,), dynamic_axes=[Axis.default_batch_axis()])
ce_model1 = cross_entropy_with_softmax(model1, model1_label)
pe_model1 = classification_error(model1, model1_label)
model2 = Dense(model2_dim)(core(x))
model2_label = input_variable((model2_dim,))
ce_model2 = cross_entropy_with_softmax(model2, model2_label)
pe_model2 = classification_error(model2, model2_label)
ce = 0.5 * sequence.reduce_sum(ce_model2) + 0.5 * ce_model1
lr_schedule = learning_rate_schedule(0.003, UnitType.sample)
trainer_multitask = Trainer(model1, (ce, pe_model1), sgd(ce.parameters, lr=lr_schedule))
x_data = np.asarray([[2., 1.], [1., 2.]], np.float32)
model1_label_data = np.asarray([1., 0., 0.], np.float32)
model2_label_data = np.asarray([[0., 1., 0., 0.], [0., 0., 0., 1.]], np.float32)
trainer_multitask.train_minibatch({x : [x_data], model1_label : [model1_label_data], model2_label : [model2_label_data]})
def test_eval_sparse_dense(tmpdir, device_id):
from cntk import Axis
from cntk.io import MinibatchSource, CTFDeserializer, StreamDef, StreamDefs
from cntk.device import cpu, gpu, set_default_device
from cntk.ops import input_variable, times
from scipy.sparse import csr_matrix
input_vocab_dim = label_vocab_dim = 69
ctf_data = '''\
0 |S0 3:1 |# <s> |S1 3:1 |# <s>
0 |S0 4:1 |# A |S1 32:1 |# ~AH
0 |S0 5:1 |# B |S1 36:1 |# ~B
0 |S0 4:1 |# A |S1 31:1 |# ~AE
0 |S0 7:1 |# D |S1 38:1 |# ~D
0 |S0 12:1 |# I |S1 47:1 |# ~IY
0 |S0 1:1 |# </s> |S1 1:1 |# </s>
2 |S0 60:1 |# <s> |S1 3:1 |# <s>
2 |S0 61:1 |# A |S1 32:1 |# ~AH
'''
ctf_file = str(tmpdir/'2seqtest.txt')
with open(ctf_file, 'w') as f:
f.write(ctf_data)
mbs = MinibatchSource(CTFDeserializer(ctf_file, StreamDefs(
features = StreamDef(field='S0', shape=input_vocab_dim, is_sparse=True),
labels = StreamDef(field='S1', shape=label_vocab_dim, is_sparse=True)
)), randomize=False, epoch_size = 2)
batch_axis = Axis.default_batch_axis()
input_seq_axis = Axis('inputAxis')
label_seq_axis = Axis('labelAxis')
input_dynamic_axes = [batch_axis, input_seq_axis]
raw_input = input_variable(
shape=input_vocab_dim, dynamic_axes=input_dynamic_axes,
name='raw_input', is_sparse=True)
mb_valid = mbs.next_minibatch(minibatch_size_in_samples=100,
input_map={raw_input : mbs.streams.features})
z = times(raw_input, np.eye(input_vocab_dim))
e_reader = z.eval(mb_valid)
# CSR with the raw_input encoding in ctf_data
one_hot_data = [
[3, 4, 5, 4, 7, 12, 1],
[60, 61]
]
data = [csr_matrix(np.eye(input_vocab_dim, dtype=np.float32)[d]) for d in
one_hot_data]
e_csr = z.eval({raw_input: data}, device=cntk_device(device_id))
assert np.all([np.allclose(a, b) for a,b in zip(e_reader, e_csr)])
# One-hot with the raw_input encoding in ctf_data
data = one_hot(one_hot_data, num_classes=input_vocab_dim)
e_hot = z.eval({raw_input: data}, device=cntk_device(device_id))
assert np.all([np.allclose(a, b) for a,b in zip(e_reader, e_hot)])
def create_inputs(vocab_dim):
batch_axis = Axis.default_batch_axis()
input_seq_axis = Axis('inputAxis')
input_dynamic_axes = [batch_axis, input_seq_axis]
input_sequence = input_variable(shape=vocab_dim, dynamic_axes=input_dynamic_axes)
label_sequence = input_variable(shape=vocab_dim, dynamic_axes=input_dynamic_axes)
return input_sequence, label_sequence
def test_op_reduce_mean_all_constant(input_data, axis, device_id, precision):
dt = PRECISION_TO_TYPE[precision]
value = AA(input_data, dtype=dt)
from .. import reduce_mean
from cntk import Axis, Constant
a = Constant(value, name='a')
input_op = reduce_mean(a, axis=Axis.all_axes())
expected_forward = AA(np.mean(value))
actual_forward = input_op.eval()
assert np.allclose(actual_forward, expected_forward)
def train_sequence_classifier(debug_output=False):
input_dim = 2000
cell_dim = 25
hidden_dim = 25
embedding_dim = 50
num_output_classes = 5
# Input variables denoting the features and label data
features = input_variable(shape=input_dim, is_sparse=True)
label = input_variable(num_output_classes, dynamic_axes=[
Axis.default_batch_axis()])
# Instantiate the sequence classification model
classifier_output = LSTM_sequence_classifer_net(
features, num_output_classes, embedding_dim, hidden_dim, cell_dim)
ce = cross_entropy_with_softmax(classifier_output, label)
pe = classification_error(classifier_output, label)
rel_path = r"../../../../Tests/EndToEndTests/Text/SequenceClassification/Data/Train.ctf"
path = os.path.join(os.path.dirname(os.path.abspath(__file__)), rel_path)
reader = create_reader(path, True, input_dim, num_output_classes)
input_map = {
features : reader.streams.features,
label : reader.streams.labels
}
lr_per_sample = learning_rate_schedule(0.0005, UnitType.sample)
# Instantiate the trainer object to drive the model training
trainer = Trainer(classifier_output, (ce, pe),
sgd(classifier_output.parameters, lr=lr_per_sample))
# Get minibatches of sequences to train with and perform model training
minibatch_size = 200
training_progress_output_freq = 10
if debug_output:
training_progress_output_freq = training_progress_output_freq/3
for i in range(251):
mb = reader.next_minibatch(minibatch_size, input_map=input_map)
trainer.train_minibatch(mb)
print_training_progress(trainer, i, training_progress_output_freq)
import copy
evaluation_average = copy.copy(
trainer.previous_minibatch_evaluation_average)
loss_average = copy.copy(trainer.previous_minibatch_loss_average)
return evaluation_average, loss_average
def train_sequence_classifier():
input_dim = 2000;
cell_dim = 25;
hidden_dim = 25;
embedding_dim = 50;
num_output_classes = 5;
# Input variables denoting the features and label data
features = input_variable(shape=input_dim, is_sparse=True)
label = input_variable(num_output_classes, dynamic_axes = [Axis.default_batch_axis()])
# Instantiate the sequence classification model
classifier_output = LSTM_sequence_classifer_net(features, num_output_classes, embedding_dim, hidden_dim, cell_dim)
ce = cross_entropy_with_softmax(classifier_output, label)
pe = classification_error(classifier_output, label)
rel_path = r"../../../../Tests/EndToEndTests/Text/SequenceClassification/Data/Train.ctf"
path = os.path.join(os.path.dirname(os.path.abspath(__file__)), rel_path)
feature_stream_name = 'features'
labels_stream_name = 'labels'
mb_source = text_format_minibatch_source(path, [
StreamConfiguration( feature_stream_name, input_dim, True, 'x' ),
StreamConfiguration( labels_stream_name, num_output_classes, False, 'y')], 0)
features_si = mb_source.stream_info(features)
labels_si = mb_source.stream_info(label)
# Instantiate the trainer object to drive the model training
lr = lr = learning_rates_per_sample(0.0005)
trainer = Trainer(classifier_output, ce, pe, [sgd_learner(classifier_output.owner.parameters(), lr)])
# Get minibatches of sequences to train with and perform model training
minibatch_size = 200
training_progress_output_freq = 10
i = 0;
while True:
mb = mb_source.get_next_minibatch(minibatch_size)
if len(mb) == 0:
break
# Specify the mapping of input variables in the model to actual minibatch data to be trained with
arguments = {features : mb[features_si].m_data, label : mb[labels_si].m_data}
trainer.train_minibatch(arguments)
print_training_progress(trainer, i, training_progress_output_freq)
i += 1
def test_op_reduce_mean_all_constant(input_data, axis, device_id, precision):
# dt = PRECISION_TO_TYPE[precision]
# FIXME: we'd like to do dt = PRECISION_TO_TYPE[precision]
# however there seems to be an issue with actual_forward below
# that gets computed correctly but by the time np.allclose executes
# it contains garbage values. The problem goes away if one uses
# actual_forward = np.copy(input_op.eval())
dt = np.float32
value = AA(input_data, dtype=dt)
from .. import reduce_mean
from cntk import Axis, Constant
a = Constant(value, name='a')
input_op = reduce_mean(a, axis=Axis.all_axes())
expected_forward = AA(np.mean(value))
actual_forward = input_op.eval()
assert np.allclose(actual_forward, expected_forward)
def test_op_reduce_all(input_data, axis, device_id, precision):
# FIXME: we'd like to do dt = PRECISION_TO_TYPE[precision]
# however there seems to be an issue with actual_forward below
# that gets computed correctly but by the time np.allclose executes
# it contains garbage values. The problem goes away if one uses
# actual_forward = np.copy(input_op.eval(binding))
dt = np.float32
data = AA(input_data, dtype=dt)
a = I(shape=data.shape,
dtype=sanitize_dtype_cntk(dt),
needs_gradient=True,
name='a')
# create batch
value = [AA([data,data-0.5], dtype=dt),AA([data+0.25], dtype=dt)]
from .. import reduce_sum, reduce_max, reduce_min, reduce_mean, reduce_log_sum_exp, reduce_prod
from cntk import Axis
def max_bwd(x,f):
y = np.zeros_like(x)
yr = y.ravel()
xr = x.ravel()
for i in range(x.size):
if xr[i] == f: yr[i] = 1
return y
ops = [ (reduce_sum, lambda x:AA(sum(np.sum(xi) for xi in x)), lambda x,f:[np.ones_like(xi) for xi in x]),
(reduce_max, lambda x:AA(max(np.max(xi) for xi in x)), lambda x,f:[max_bwd(xi,f) for xi in x]),
(reduce_min, lambda x:AA(min(np.min(xi) for xi in x)), lambda x,f:[max_bwd(xi,f) for xi in x]),
(reduce_mean, lambda x:AA(sum(np.sum(xi) for xi in x)/sum(xi.size for xi in x)), lambda x,f:[np.ones_like(xi)/sum(xj.size for xj in x) for xi in x]),
(reduce_log_sum_exp, lambda x:AA(np.log(sum(np.sum(np.exp(xi)) for xi in x))), lambda x,f:[np.exp(xi-f) for xi in x]),
(reduce_prod, lambda x:AA(np.prod([np.prod(xi) for xi in x])), lambda x,f:[f/xi for xi in x])
]
for op,fwd,bwd in ops:
input_op = op(a, axis=Axis.all_axes())
expected_forward = fwd(value)
expected_backward = bwd(value,expected_forward)
binding = {a: value}
actual_backward = input_op.grad(binding)[0]
actual_forward = np.copy(input_op.eval(binding))
assert np.allclose(actual_forward, expected_forward)
for ab,eb in zip (actual_backward, expected_backward):
assert np.allclose(ab, eb)
def test_op_reduce_over_batch_axis(input_data, device_id, precision):
from .. import reduce_sum, reduce_max, reduce_min, reduce_mean, reduce_log_sum_exp, reduce_prod
from cntk import Axis
dt = PRECISION_TO_TYPE[precision]
data = AA(input_data, dtype=dt)
a = C.input_variable(shape=data.shape[1:],
dtype=sanitize_dtype_cntk(dt),
needs_gradient=True,
name='a')
def min_max_bwd(x, f):
forward_array = np.asarray(f, dtype=dt)
min_max_elements = forward_array.reshape(forward_array.size).tolist()
# place 1.0s where minimum or maximum elements are
backward = np.zeros_like(x)
for element in min_max_elements:
backward += np.asarray(x == element)
return backward
ops = [
(reduce_sum, lambda x:np.sum(x, axis=0, keepdims=False), lambda x,f:np.ones_like(x)),
(reduce_max, lambda x:np.amax(x, axis=0, keepdims=False), lambda x,f:min_max_bwd(x,f)),
(reduce_min, lambda x:np.amin(x, axis=0, keepdims=False), lambda x,f:min_max_bwd(x,f)),
(reduce_mean, lambda x:np.mean(x, axis=0, keepdims=False), lambda x,f:np.ones_like(x)/x.shape[0]),
(reduce_log_sum_exp, lambda x:np.log(np.sum(np.exp(x), axis=0, keepdims=False)), lambda x,f:np.exp(x-f)),
(reduce_prod, lambda x:np.prod(x, axis=0, keepdims=False), lambda x,f:f / x)
]
for op,fwd,bwd in ops:
input_op = op(a, axis=Axis.default_batch_axis())
expected_forward = fwd(data)
expected_backward = bwd(data, expected_forward)
binding = {a: data}
actual_backward = input_op.grad(binding)
actual_forward = input_op.eval(binding)
assert np.allclose(actual_forward, expected_forward)
for ab,eb in zip (actual_backward, expected_backward):
assert np.allclose(ab, eb)
def test_recurrent_block(block_type, block_outputs_count, block_size, W_mult, H_mult, expected_res):
input_shape = 4
sequenceAxis = Axis('sequenceAxis')
y = C.input_variable(input_shape, dynamic_axes=[Axis.default_batch_axis(), sequenceAxis])
data = np.reshape(np.arange(0,16, dtype=np.float32), (1,4,4))
rnn_block = block_type(block_size, init=0.1)
assert len(rnn_block.outputs) == block_outputs_count
rnn_net = Recurrence(rnn_block)(y)
assert rnn_net.b.shape == (W_mult*block_size,)
assert rnn_net.W.shape == (input_shape, W_mult*block_size)
assert rnn_net.H.shape == (block_size, H_mult*block_size)
res = rnn_net.eval(data)
expected = np.asarray(expected_res, dtype=np.float32)
np.testing.assert_array_almost_equal(res[0], expected, decimal=6)
def test_op_reduce_all(input_data, axis, device_id, precision):
dt = PRECISION_TO_TYPE[precision]
data = AA(input_data, dtype=dt)
a = C.sequence.input_variable(shape=data.shape,
dtype=sanitize_dtype_cntk(dt),
needs_gradient=True,
name='a')
# create batch
value = [AA([data,data-0.5], dtype=dt),AA([data+0.25], dtype=dt)]
from .. import reduce_sum, reduce_max, reduce_min, reduce_mean, reduce_log_sum_exp, reduce_prod
from cntk import Axis
def max_bwd(x,f):
y = np.zeros_like(x)
yr = y.ravel()
xr = x.ravel()
for i in range(x.size):
if xr[i] == f: yr[i] = 1
return y
ops = [ (reduce_sum, lambda x:AA(sum(np.sum(xi) for xi in x)), lambda x,f:[np.ones_like(xi) for xi in x]),
(reduce_max, lambda x:AA(max(np.max(xi) for xi in x)), lambda x,f:[max_bwd(xi,f) for xi in x]),
(reduce_min, lambda x:AA(min(np.min(xi) for xi in x)), lambda x,f:[max_bwd(xi,f) for xi in x]),
(reduce_mean, lambda x:AA(sum(np.sum(xi) for xi in x)/sum(xi.size for xi in x)), lambda x,f:[np.ones_like(xi)/sum(xj.size for xj in x) for xi in x]),
(reduce_log_sum_exp, lambda x:AA(np.log(sum(np.sum(np.exp(xi)) for xi in x))), lambda x,f:[np.exp(xi-f) for xi in x]),
(reduce_prod, lambda x:AA(np.prod([np.prod(xi) for xi in x])), lambda x,f:[f/xi for xi in x])
]
for op,fwd,bwd in ops:
input_op = op(a, axis=Axis.all_axes())
expected_forward = fwd(value)
expected_backward = bwd(value,expected_forward)
binding = {a: value}
actual_backward = input_op.grad(binding)
actual_forward = input_op.eval(binding)
assert np.allclose(actual_forward, expected_forward)
for ab,eb in zip (actual_backward, expected_backward):
assert np.allclose(ab, eb)
def train_sequence_classifier(debug_output=False):
input_dim = 2000
cell_dim = 25
hidden_dim = 25
embedding_dim = 50
num_output_classes = 5
# Input variables denoting the features and label data
features = input_variable(shape=input_dim, is_sparse=True)
label = input_variable(num_output_classes, dynamic_axes=[
Axis.default_batch_axis()])
# Instantiate the sequence classification model
classifier_output = LSTM_sequence_classifer_net(
features, num_output_classes, embedding_dim, hidden_dim, cell_dim)
ce = cross_entropy_with_softmax(classifier_output, label)
pe = classification_error(classifier_output, label)
rel_path = r"../../../../Tests/EndToEndTests/Text/SequenceClassification/Data/Train.ctf"
path = os.path.join(os.path.dirname(os.path.abspath(__file__)), rel_path)
feature_stream_name = 'features'
labels_stream_name = 'labels'
mb_source = text_format_minibatch_source(path, [
StreamConfiguration(feature_stream_name, input_dim, True, 'x'),
StreamConfiguration(labels_stream_name, num_output_classes, False, 'y')], 0)
features_si = mb_source[features]
labels_si = mb_source[label]
# Instantiate the trainer object to drive the model training
trainer = Trainer(classifier_output, ce, pe,
[sgd(classifier_output.parameters(), lr=0.0005)])
# Get minibatches of sequences to train with and perform model training
minibatch_size = 200
training_progress_output_freq = 10
i = 0
if debug_output:
training_progress_output_freq = training_progress_output_freq/3
while True:
mb = mb_source.get_next_minibatch(minibatch_size)
if len(mb) == 0:
break
# Specify the mapping of input variables in the model to actual
# minibatch data to be trained with
arguments = {features: mb[features_si],
label: mb[labels_si]}
trainer.train_minibatch(arguments)
print_training_progress(trainer, i, training_progress_output_freq)
i += 1
import copy
evaluation_average = copy.copy(
trainer.previous_minibatch_evaluation_average())
loss_average = copy.copy(trainer.previous_minibatch_loss_average())
return evaluation_average, loss_average
def evalImage(url):
# set image
eval_model = load_model(model_path)
classes = globalvars['classes']
image_input = input_variable((num_channels, image_height, image_width),
dynamic_axes=[Axis.default_batch_axis()],
name=feature_node_name)
roi_input = input_variable((cfg["CNTK"].INPUT_ROIS_PER_IMAGE, 5),
dynamic_axes=[Axis.default_batch_axis()])
dims_input = input_variable((6), dynamic_axes=[Axis.default_batch_axis()])
frcn_eval = eval_model(image_input, dims_input)
# Create the minibatch source
minibatch_source = ObjectDetectionMinibatchSource(
url,
max_annotations_per_image=cfg["CNTK"].INPUT_ROIS_PER_IMAGE,
pad_width=image_width,
pad_height=image_height,
pad_value=img_pad_value,
randomize=False,
use_flipping=False,
max_images=cfg["CNTK"].NUM_TEST_IMAGES)
# define mapping from reader streams to network inputs
input_map = {
minibatch_source.image_si: image_input,
minibatch_source.roi_si: roi_input,
minibatch_source.dims_si: dims_input
}
# evaluate test images and write netwrok output to file
all_gt_infos = {key: [] for key in classes}
img_i = 0
mb_data = minibatch_source.next_minibatch(url, 1, input_map=input_map)
gt_row = mb_data[roi_input].asarray()
gt_row = gt_row.reshape((cfg["CNTK"].INPUT_ROIS_PER_IMAGE, 5))
all_gt_boxes = gt_row[np.where(gt_row[:, -1] > 0)]
for cls_index, cls_name in enumerate(classes):
if cls_index == 0: continue
cls_gt_boxes = all_gt_boxes[np.where(all_gt_boxes[:, -1] == cls_index)]
all_gt_infos[cls_name].append({
'bbox': np.array(cls_gt_boxes),
'difficult': [False] * len(cls_gt_boxes),
'det': [False] * len(cls_gt_boxes)
})
output = frcn_eval.eval({
image_input: mb_data[image_input],
dims_input: mb_data[dims_input]
})
out_dict = dict([(k.name, k) for k in output])
out_cls_pred = output[out_dict['cls_pred']][0]
out_rpn_rois = output[out_dict['rpn_rois']][0]
out_bbox_regr = output[out_dict['bbox_regr']][0]
labels = out_cls_pred.argmax(axis=1)
scores = out_cls_pred.max(axis=1)
result = dict()
for label in LabelList:
result.update({label: 0})
for index, label in enumerate(labels):
if result[LabelList[int(label)]] < scores[index]:
result.update({LabelList[int(label)]: scores[index]})
pp = pprint.PrettyPrinter(indent=4)
print("---------------------")
print(url)
pp.pprint(result)
print("---------------------")
for number, accuracy in result.items():
result.update({number: str(accuracy)})
return result
def train_sequence_to_sequence_translator():
input_vocab_dim = 69
label_vocab_dim = 69
hidden_dim = 512
num_layers = 2
# Source and target inputs to the model
input_dynamic_axes = [ Axis('inputAxis'), Axis.default_batch_axis() ]
raw_input = input_variable(shape=(input_vocab_dim), dynamic_axes = input_dynamic_axes)
label_dynamic_axes = [ Axis('labelAxis'), Axis.default_batch_axis() ]
raw_labels = input_variable(shape=(label_vocab_dim), dynamic_axes = label_dynamic_axes)
# Instantiate the sequence to sequence translation model
input_sequence = raw_input
# Drop the sentence start token from the label, for decoder training
label_sequence = slice(raw_labels, label_dynamic_axes[0], 1, 0)
label_sentence_start = sequence.first(raw_labels)
is_first_label = sequence.is_first(label_sequence)
label_sentence_start_scattered = sequence.scatter(label_sentence_start, is_first_label)
# Encoder
encoder_outputH = stabilize(input_sequence)
for i in range(0, num_layers):
(encoder_outputH, encoder_outputC) = LSTMP_component_with_self_stabilization(encoder_outputH, hidden_dim, hidden_dim, future_value, future_value)
thought_vectorH = sequence.first(encoder_outputH)
thought_vectorC = sequence.first(encoder_outputC)
thought_vector_broadcastH = sequence.broadcast_as(thought_vectorH, label_sequence)
thought_vector_broadcastC = sequence.broadcast_as(thought_vectorC, label_sequence)
# Decoder
decoder_history_from_ground_truth = label_sequence
decoder_input = element_select(is_first_label, label_sentence_start_scattered, past_value(decoder_history_from_ground_truth))
decoder_outputH = stabilize(decoder_input)
for i in range(0, num_layers):
if (i == 0):
recurrence_hookH = past_value
recurrence_hookC = past_value
else:
isFirst = sequence.is_first(label_sequence)
recurrence_hookH = lambda operand: element_select(isFirst, thought_vector_broadcastH, past_value(operand))
recurrence_hookC = lambda operand: element_select(isFirst, thought_vector_broadcastC, past_value(operand))
(decoder_outputH, encoder_outputC) = LSTMP_component_with_self_stabilization(decoder_outputH, hidden_dim, hidden_dim, recurrence_hookH, recurrence_hookC)
decoder_output = decoder_outputH
decoder_dim = hidden_dim
# Softmax output layer
z = linear_layer(stabilize(decoder_output), label_vocab_dim)
ce = cross_entropy_with_softmax(z, label_sequence)
errs = classification_error(z, label_sequence)
rel_path = r"../../../../Examples/SequenceToSequence/CMUDict/Data/cmudict-0.7b.train-dev-20-21.ctf"
path = os.path.join(os.path.dirname(os.path.abspath(__file__)), rel_path)
feature_stream_name = 'features'
labels_stream_name = 'labels'
mb_source = text_format_minibatch_source(path, [
StreamConfiguration( feature_stream_name, input_vocab_dim, True, 'S0' ),
StreamConfiguration( labels_stream_name, label_vocab_dim, True, 'S1') ], 10000)
features_si = mb_source.stream_info(feature_stream_name)
labels_si = mb_source.stream_info(labels_stream_name)
# Instantiate the trainer object to drive the model training
lr = learning_rates_per_sample(0.007)
momentum_time_constant = 1100
momentum_per_sample = momentums_per_sample(math.exp(-1.0 / momentum_time_constant))
clipping_threshold_per_sample = 2.3
gradient_clipping_with_truncation = True
trainer = Trainer(z, ce, errs, [momentum_sgd_learner(z.owner.parameters(), lr, momentum_per_sample, clipping_threshold_per_sample, gradient_clipping_with_truncation)])
# Get minibatches of sequences to train with and perform model training
minibatch_size = 72
training_progress_output_freq = 10
while True:
mb = mb_source.get_next_minibatch(minibatch_size)
if len(mb) == 0:
break
# Specify the mapping of input variables in the model to actual minibatch data to be trained with
arguments = {raw_input : mb[features_si].m_data, raw_labels : mb[labels_si].m_data}
trainer.train_minibatch(arguments)
print_training_progress(trainer, i, training_progress_output_freq)
i += 1
def train_faster_rcnn_alternating(cfg):
'''
4-Step Alternating Training scheme from the Faster R-CNN paper:
# Create initial network, only rpn, without detection network
# --> train only the rpn (and conv3_1 and up for VGG16)
# buffer region proposals from rpn
# Create full network, initialize conv layers with imagenet, use buffered proposals
# --> train only detection network (and conv3_1 and up for VGG16)
# Keep conv weights from detection network and fix them
# --> train only rpn
# buffer region proposals from rpn
# Keep conv and rpn weights from step 3 and fix them
# --> train only detection network
'''
# setting pre- and post-nms top N to training values since buffered proposals are used for further training
test_pre = cfg["TEST"].RPN_PRE_NMS_TOP_N
test_post = cfg["TEST"].RPN_POST_NMS_TOP_N
cfg["TEST"].RPN_PRE_NMS_TOP_N = cfg["TRAIN"].RPN_PRE_NMS_TOP_N
cfg["TEST"].RPN_POST_NMS_TOP_N = cfg["TRAIN"].RPN_POST_NMS_TOP_N
# Learning parameters
rpn_lr_factor = cfg["MODEL"].RPN_LR_FACTOR
rpn_lr_per_sample_scaled = [
x * rpn_lr_factor for x in cfg["CNTK"].RPN_LR_PER_SAMPLE
]
frcn_lr_factor = cfg["MODEL"].FRCN_LR_FACTOR
frcn_lr_per_sample_scaled = [
x * frcn_lr_factor for x in cfg["CNTK"].FRCN_LR_PER_SAMPLE
]
l2_reg_weight = cfg["CNTK"].L2_REG_WEIGHT
mm_schedule = momentum_schedule(cfg["CNTK"].MOMENTUM_PER_MB)
rpn_epochs = cfg["CNTK"].RPN_EPOCHS
frcn_epochs = cfg["CNTK"].FRCN_EPOCHS
feature_node_name = cfg["MODEL"].FEATURE_NODE_NAME
last_conv_node_name = cfg["MODEL"].LAST_CONV_NODE_NAME
print("Using base model: {}".format(cfg["MODEL"].BASE_MODEL))
print("rpn_lr_per_sample: {}".format(rpn_lr_per_sample_scaled))
print("frcn_lr_per_sample: {}".format(frcn_lr_per_sample_scaled))
debug_output = cfg["CNTK"].DEBUG_OUTPUT
if debug_output:
print("Storing graphs and models to %s." % cfg.OUTPUT_PATH)
# Input variables denoting features, labeled ground truth rois (as 5-tuples per roi) and image dimensions
image_input = input_variable(shape=(cfg.NUM_CHANNELS, cfg.IMAGE_HEIGHT,
cfg.IMAGE_WIDTH),
dynamic_axes=[Axis.default_batch_axis()],
name=feature_node_name)
feat_norm = image_input - Constant([[[v]]
for v in cfg["MODEL"].IMG_PAD_COLOR])
roi_input = input_variable((cfg.INPUT_ROIS_PER_IMAGE, 5),
dynamic_axes=[Axis.default_batch_axis()])
scaled_gt_boxes = alias(roi_input, name='roi_input')
dims_input = input_variable((6), dynamic_axes=[Axis.default_batch_axis()])
dims_node = alias(dims_input, name='dims_input')
rpn_rois_input = input_variable((cfg["TRAIN"].RPN_POST_NMS_TOP_N, 4),
dynamic_axes=[Axis.default_batch_axis()])
rpn_rois_buf = alias(rpn_rois_input, name='rpn_rois')
# base image classification model (e.g. VGG16 or AlexNet)
base_model = load_model(cfg['BASE_MODEL_PATH'])
print("stage 1a - rpn")
if True:
# Create initial network, only rpn, without detection network
# initial weights train?
# conv: base_model only conv3_1 and up
# rpn: init new yes
# frcn: - -
# conv layers
conv_layers = clone_conv_layers(base_model, cfg)
conv_out = conv_layers(feat_norm)
# RPN and losses
rpn_rois, rpn_losses = create_rpn(conv_out, scaled_gt_boxes, dims_node,
cfg)
stage1_rpn_network = combine([rpn_rois, rpn_losses])
# train
if debug_output:
plot(
stage1_rpn_network,
os.path.join(
cfg.OUTPUT_PATH,
"graph_frcn_train_stage1a_rpn." + cfg["CNTK"].GRAPH_TYPE))
train_model(image_input, roi_input, dims_input, rpn_losses, rpn_losses,
rpn_lr_per_sample_scaled, mm_schedule, l2_reg_weight,
rpn_epochs, cfg)
print("stage 1a - buffering rpn proposals")
buffered_proposals_s1 = compute_rpn_proposals(stage1_rpn_network,
image_input, roi_input,
dims_input, cfg)
print("stage 1b - frcn")
if True:
# Create full network, initialize conv layers with imagenet, fix rpn weights
# initial weights train?
# conv: base_model only conv3_1 and up
# rpn: stage1a rpn model no --> use buffered proposals
# frcn: base_model + new yes
# conv_layers
conv_layers = clone_conv_layers(base_model, cfg)
conv_out = conv_layers(feat_norm)
# use buffered proposals in target layer
rois, label_targets, bbox_targets, bbox_inside_weights = \
create_proposal_target_layer(rpn_rois_buf, scaled_gt_boxes, cfg)
# Fast RCNN and losses
fc_layers = clone_model(base_model, [cfg["MODEL"].POOL_NODE_NAME],
[cfg["MODEL"].LAST_HIDDEN_NODE_NAME],
CloneMethod.clone)
cls_score, bbox_pred = create_fast_rcnn_predictor(
conv_out, rois, fc_layers, cfg)
detection_losses = create_detection_losses(cls_score, label_targets,
bbox_pred, rois,
bbox_targets,
bbox_inside_weights, cfg)
pred_error = classification_error(cls_score,
label_targets,
axis=1,
name="pred_error")
stage1_frcn_network = combine(
[rois, cls_score, bbox_pred, detection_losses, pred_error])
# train
if debug_output:
plot(
stage1_frcn_network,
os.path.join(
cfg.OUTPUT_PATH,
"graph_frcn_train_stage1b_frcn." + cfg["CNTK"].GRAPH_TYPE))
train_model(image_input,
roi_input,
dims_input,
detection_losses,
pred_error,
frcn_lr_per_sample_scaled,
mm_schedule,
l2_reg_weight,
frcn_epochs,
cfg,
rpn_rois_input=rpn_rois_input,
buffered_rpn_proposals=buffered_proposals_s1)
buffered_proposals_s1 = None
print("stage 2a - rpn")
if True:
# Keep conv weights from detection network and fix them
# initial weights train?
# conv: stage1b frcn model no
# rpn: stage1a rpn model yes
# frcn: - -
# conv_layers
conv_layers = clone_model(stage1_frcn_network, [feature_node_name],
[last_conv_node_name], CloneMethod.freeze)
conv_out = conv_layers(image_input)
# RPN and losses
rpn = clone_model(stage1_rpn_network,
[last_conv_node_name, "roi_input", "dims_input"],
["rpn_rois", "rpn_losses"], CloneMethod.clone)
rpn_net = rpn(conv_out, dims_node, scaled_gt_boxes)
rpn_rois = rpn_net.outputs[0]
rpn_losses = rpn_net.outputs[1]
stage2_rpn_network = combine([rpn_rois, rpn_losses])
# train
if debug_output:
plot(
stage2_rpn_network,
os.path.join(
cfg.OUTPUT_PATH,
"graph_frcn_train_stage2a_rpn." + cfg["CNTK"].GRAPH_TYPE))
train_model(image_input, roi_input, dims_input, rpn_losses, rpn_losses,
rpn_lr_per_sample_scaled, mm_schedule, l2_reg_weight,
rpn_epochs, cfg)
print("stage 2a - buffering rpn proposals")
buffered_proposals_s2 = compute_rpn_proposals(stage2_rpn_network,
image_input, roi_input,
dims_input, cfg)
print("stage 2b - frcn")
if True:
# Keep conv and rpn weights from step 3 and fix them
# initial weights train?
# conv: stage2a rpn model no
# rpn: stage2a rpn model no --> use buffered proposals
# frcn: stage1b frcn model yes -
# conv_layers
conv_layers = clone_model(stage2_rpn_network, [feature_node_name],
[last_conv_node_name], CloneMethod.freeze)
conv_out = conv_layers(image_input)
# Fast RCNN and losses
frcn = clone_model(stage1_frcn_network,
[last_conv_node_name, "rpn_rois", "roi_input"], [
"cls_score", "bbox_regr", "rpn_target_rois",
"detection_losses", "pred_error"
], CloneMethod.clone)
stage2_frcn_network = frcn(conv_out, rpn_rois_buf, scaled_gt_boxes)
detection_losses = stage2_frcn_network.outputs[3]
pred_error = stage2_frcn_network.outputs[4]
# train
if debug_output:
plot(
stage2_frcn_network,
os.path.join(
cfg.OUTPUT_PATH,
"graph_frcn_train_stage2b_frcn." + cfg["CNTK"].GRAPH_TYPE))
train_model(image_input,
roi_input,
dims_input,
detection_losses,
pred_error,
frcn_lr_per_sample_scaled,
mm_schedule,
l2_reg_weight,
frcn_epochs,
cfg,
rpn_rois_input=rpn_rois_input,
buffered_rpn_proposals=buffered_proposals_s2)
buffered_proposals_s2 = None
# resetting config values to original test values
cfg["TEST"].RPN_PRE_NMS_TOP_N = test_pre
cfg["TEST"].RPN_POST_NMS_TOP_N = test_post
return create_faster_rcnn_eval_model(stage2_frcn_network,
image_input,
dims_input,
cfg,
rpn_model=stage2_rpn_network)
def train_faster_rcnn_alternating(cfg):
'''
4-Step Alternating Training scheme from the Faster R-CNN paper:
# Create initial network, only rpn, without detection network
# --> train only the rpn (and conv3_1 and up for VGG16)
# buffer region proposals from rpn
# Create full network, initialize conv layers with imagenet, use buffered proposals
# --> train only detection network (and conv3_1 and up for VGG16)
# Keep conv weights from detection network and fix them
# --> train only rpn
# buffer region proposals from rpn
# Keep conv and rpn weights from step 3 and fix them
# --> train only detection network
'''
# setting pre- and post-nms top N to training values since buffered proposals are used for further training
test_pre = cfg["TEST"].RPN_PRE_NMS_TOP_N
test_post = cfg["TEST"].RPN_POST_NMS_TOP_N
cfg["TEST"].RPN_PRE_NMS_TOP_N = cfg["TRAIN"].RPN_PRE_NMS_TOP_N
cfg["TEST"].RPN_POST_NMS_TOP_N = cfg["TRAIN"].RPN_POST_NMS_TOP_N
# Learning parameters
rpn_lr_factor = cfg["MODEL"].RPN_LR_FACTOR
rpn_lr_per_sample_scaled = [x * rpn_lr_factor for x in cfg["CNTK"].RPN_LR_PER_SAMPLE]
frcn_lr_factor = cfg["MODEL"].FRCN_LR_FACTOR
frcn_lr_per_sample_scaled = [x * frcn_lr_factor for x in cfg["CNTK"].FRCN_LR_PER_SAMPLE]
l2_reg_weight = cfg["CNTK"].L2_REG_WEIGHT
mm_schedule = momentum_schedule(cfg["CNTK"].MOMENTUM_PER_MB)
rpn_epochs = cfg["CNTK"].RPN_EPOCHS
frcn_epochs = cfg["CNTK"].FRCN_EPOCHS
feature_node_name = cfg["MODEL"].FEATURE_NODE_NAME
last_conv_node_name = cfg["MODEL"].LAST_CONV_NODE_NAME
print("Using base model: {}".format(cfg["MODEL"].BASE_MODEL))
print("rpn_lr_per_sample: {}".format(rpn_lr_per_sample_scaled))
print("frcn_lr_per_sample: {}".format(frcn_lr_per_sample_scaled))
debug_output=cfg["CNTK"].DEBUG_OUTPUT
if debug_output:
print("Storing graphs and models to %s." % cfg.OUTPUT_PATH)
# Input variables denoting features, labeled ground truth rois (as 5-tuples per roi) and image dimensions
image_input = input_variable(shape=(cfg.NUM_CHANNELS, cfg.IMAGE_HEIGHT, cfg.IMAGE_WIDTH),
dynamic_axes=[Axis.default_batch_axis()],
name=feature_node_name)
feat_norm = image_input - Constant([[[v]] for v in cfg["MODEL"].IMG_PAD_COLOR])
roi_input = input_variable((cfg.INPUT_ROIS_PER_IMAGE, 5), dynamic_axes=[Axis.default_batch_axis()])
scaled_gt_boxes = alias(roi_input, name='roi_input')
dims_input = input_variable((6), dynamic_axes=[Axis.default_batch_axis()])
dims_node = alias(dims_input, name='dims_input')
rpn_rois_input = input_variable((cfg["TRAIN"].RPN_POST_NMS_TOP_N, 4), dynamic_axes=[Axis.default_batch_axis()])
rpn_rois_buf = alias(rpn_rois_input, name='rpn_rois')
# base image classification model (e.g. VGG16 or AlexNet)
base_model = load_model(cfg['BASE_MODEL_PATH'])
print("stage 1a - rpn")
if True:
# Create initial network, only rpn, without detection network
# initial weights train?
# conv: base_model only conv3_1 and up
# rpn: init new yes
# frcn: - -
# conv layers
conv_layers = clone_conv_layers(base_model, cfg)
conv_out = conv_layers(feat_norm)
# RPN and losses
rpn_rois, rpn_losses = create_rpn(conv_out, scaled_gt_boxes, dims_node, cfg)
stage1_rpn_network = combine([rpn_rois, rpn_losses])
# train
if debug_output: plot(stage1_rpn_network, os.path.join(cfg.OUTPUT_PATH, "graph_frcn_train_stage1a_rpn." + cfg["CNTK"].GRAPH_TYPE))
train_model(image_input, roi_input, dims_input, rpn_losses, rpn_losses,
rpn_lr_per_sample_scaled, mm_schedule, l2_reg_weight, rpn_epochs, cfg)
print("stage 1a - buffering rpn proposals")
buffered_proposals_s1 = compute_rpn_proposals(stage1_rpn_network, image_input, roi_input, dims_input, cfg)
print("stage 1b - frcn")
if True:
# Create full network, initialize conv layers with imagenet, fix rpn weights
# initial weights train?
# conv: base_model only conv3_1 and up
# rpn: stage1a rpn model no --> use buffered proposals
# frcn: base_model + new yes
# conv_layers
conv_layers = clone_conv_layers(base_model, cfg)
conv_out = conv_layers(feat_norm)
# use buffered proposals in target layer
rois, label_targets, bbox_targets, bbox_inside_weights = \
create_proposal_target_layer(rpn_rois_buf, scaled_gt_boxes, cfg)
# Fast RCNN and losses
fc_layers = clone_model(base_model, [cfg["MODEL"].POOL_NODE_NAME], [cfg["MODEL"].LAST_HIDDEN_NODE_NAME], CloneMethod.clone)
cls_score, bbox_pred = create_fast_rcnn_predictor(conv_out, rois, fc_layers, cfg)
detection_losses = create_detection_losses(cls_score, label_targets, bbox_pred, rois, bbox_targets, bbox_inside_weights, cfg)
pred_error = classification_error(cls_score, label_targets, axis=1, name="pred_error")
stage1_frcn_network = combine([rois, cls_score, bbox_pred, detection_losses, pred_error])
# train
if debug_output: plot(stage1_frcn_network, os.path.join(cfg.OUTPUT_PATH, "graph_frcn_train_stage1b_frcn." + cfg["CNTK"].GRAPH_TYPE))
train_model(image_input, roi_input, dims_input, detection_losses, pred_error,
frcn_lr_per_sample_scaled, mm_schedule, l2_reg_weight, frcn_epochs, cfg,
rpn_rois_input=rpn_rois_input, buffered_rpn_proposals=buffered_proposals_s1)
buffered_proposals_s1 = None
print("stage 2a - rpn")
if True:
# Keep conv weights from detection network and fix them
# initial weights train?
# conv: stage1b frcn model no
# rpn: stage1a rpn model yes
# frcn: - -
# conv_layers
conv_layers = clone_model(stage1_frcn_network, [feature_node_name], [last_conv_node_name], CloneMethod.freeze)
conv_out = conv_layers(image_input)
# RPN and losses
rpn = clone_model(stage1_rpn_network, [last_conv_node_name, "roi_input", "dims_input"], ["rpn_rois", "rpn_losses"], CloneMethod.clone)
rpn_net = rpn(conv_out, dims_node, scaled_gt_boxes)
rpn_rois = rpn_net.outputs[0]
rpn_losses = rpn_net.outputs[1]
stage2_rpn_network = combine([rpn_rois, rpn_losses])
# train
if debug_output: plot(stage2_rpn_network, os.path.join(cfg.OUTPUT_PATH, "graph_frcn_train_stage2a_rpn." + cfg["CNTK"].GRAPH_TYPE))
train_model(image_input, roi_input, dims_input, rpn_losses, rpn_losses,
rpn_lr_per_sample_scaled, mm_schedule, l2_reg_weight, rpn_epochs, cfg)
print("stage 2a - buffering rpn proposals")
buffered_proposals_s2 = compute_rpn_proposals(stage2_rpn_network, image_input, roi_input, dims_input, cfg)
print("stage 2b - frcn")
if True:
# Keep conv and rpn weights from step 3 and fix them
# initial weights train?
# conv: stage2a rpn model no
# rpn: stage2a rpn model no --> use buffered proposals
# frcn: stage1b frcn model yes -
# conv_layers
conv_layers = clone_model(stage2_rpn_network, [feature_node_name], [last_conv_node_name], CloneMethod.freeze)
conv_out = conv_layers(image_input)
# Fast RCNN and losses
frcn = clone_model(stage1_frcn_network, [last_conv_node_name, "rpn_rois", "roi_input"],
["cls_score", "bbox_regr", "rpn_target_rois", "detection_losses", "pred_error"], CloneMethod.clone)
stage2_frcn_network = frcn(conv_out, rpn_rois_buf, scaled_gt_boxes)
detection_losses = stage2_frcn_network.outputs[3]
pred_error = stage2_frcn_network.outputs[4]
# train
if debug_output: plot(stage2_frcn_network, os.path.join(cfg.OUTPUT_PATH, "graph_frcn_train_stage2b_frcn." + cfg["CNTK"].GRAPH_TYPE))
train_model(image_input, roi_input, dims_input, detection_losses, pred_error,
frcn_lr_per_sample_scaled, mm_schedule, l2_reg_weight, frcn_epochs, cfg,
rpn_rois_input=rpn_rois_input, buffered_rpn_proposals=buffered_proposals_s2)
buffered_proposals_s2 = None
# resetting config values to original test values
cfg["TEST"].RPN_PRE_NMS_TOP_N = test_pre
cfg["TEST"].RPN_POST_NMS_TOP_N = test_post
return create_faster_rcnn_eval_model(stage2_frcn_network, image_input, dims_input, cfg, rpn_model=stage2_rpn_network)
def sequence_to_sequence_translator(debug_output=False, run_test=False):
input_vocab_dim = 69
label_vocab_dim = 69
# network complexity; initially low for faster testing
hidden_dim = 256
num_layers = 1
# Source and target inputs to the model
batch_axis = Axis.default_batch_axis()
input_seq_axis = Axis('inputAxis')
label_seq_axis = Axis('labelAxis')
input_dynamic_axes = [batch_axis, input_seq_axis]
raw_input = input_variable(shape=(input_vocab_dim),
dynamic_axes=input_dynamic_axes,
name='raw_input')
label_dynamic_axes = [batch_axis, label_seq_axis]
raw_labels = input_variable(shape=(label_vocab_dim),
dynamic_axes=label_dynamic_axes,
name='raw_labels')
# Instantiate the sequence to sequence translation model
input_sequence = raw_input
# Drop the sentence start token from the label, for decoder training
label_sequence = sequence.slice(raw_labels, 1,
0) # <s> A B C </s> --> A B C </s>
label_sentence_start = sequence.first(raw_labels) # <s>
is_first_label = sequence.is_first(label_sequence) # <s> 0 0 0 ...
label_sentence_start_scattered = sequence.scatter(label_sentence_start,
is_first_label)
# Encoder
encoder_outputH = stabilize(input_sequence)
for i in range(0, num_layers):
(encoder_outputH,
encoder_outputC) = LSTMP_component_with_self_stabilization(
encoder_outputH.output, hidden_dim, hidden_dim, future_value,
future_value)
thought_vectorH = sequence.first(encoder_outputH)
thought_vectorC = sequence.first(encoder_outputC)
thought_vector_broadcastH = sequence.broadcast_as(thought_vectorH,
label_sequence)
thought_vector_broadcastC = sequence.broadcast_as(thought_vectorC,
label_sequence)
# Decoder
decoder_history_hook = alias(
label_sequence, name='decoder_history_hook') # copy label_sequence
decoder_input = element_select(is_first_label,
label_sentence_start_scattered,
past_value(decoder_history_hook))
decoder_outputH = stabilize(decoder_input)
for i in range(0, num_layers):
if (i > 0):
recurrence_hookH = past_value
recurrence_hookC = past_value
else:
isFirst = sequence.is_first(label_sequence)
recurrence_hookH = lambda operand: element_select(
isFirst, thought_vector_broadcastH, past_value(operand))
recurrence_hookC = lambda operand: element_select(
isFirst, thought_vector_broadcastC, past_value(operand))
(decoder_outputH,
encoder_outputC) = LSTMP_component_with_self_stabilization(
decoder_outputH.output, hidden_dim, hidden_dim, recurrence_hookH,
recurrence_hookC)
decoder_output = decoder_outputH
# Softmax output layer
z = linear_layer(stabilize(decoder_output), label_vocab_dim)
# Criterion nodes
ce = cross_entropy_with_softmax(z, label_sequence)
errs = classification_error(z, label_sequence)
# network output for decoder history
net_output = hardmax(z)
# make a clone of the graph where the ground truth is replaced by the network output
ng = z.clone(CloneMethod.share,
{decoder_history_hook.output: net_output.output})
# Instantiate the trainer object to drive the model training
lr_per_minibatch = learning_rate_schedule(0.5, UnitType.minibatch)
momentum_time_constant = momentum_as_time_constant_schedule(1100)
clipping_threshold_per_sample = 2.3
gradient_clipping_with_truncation = True
learner = momentum_sgd(
z.parameters,
lr_per_minibatch,
momentum_time_constant,
gradient_clipping_threshold_per_sample=clipping_threshold_per_sample,
gradient_clipping_with_truncation=gradient_clipping_with_truncation)
trainer = Trainer(z, ce, errs, learner)
# setup data
train_path = os.path.join(os.path.dirname(os.path.abspath(__file__)), "..",
"Data", "cmudict-0.7b.train-dev-20-21.ctf")
valid_path = os.path.join(os.path.dirname(os.path.abspath(__file__)), "..",
"Data", "tiny.ctf")
# readers
randomize_data = True
if run_test:
randomize_data = False # because we want to get an exact error
train_reader = create_reader(train_path, randomize_data, input_vocab_dim,
label_vocab_dim)
train_bind = {
raw_input: train_reader.streams.features,
raw_labels: train_reader.streams.labels
}
# get the vocab for printing output sequences in plaintext
vocab_path = os.path.join(os.path.dirname(os.path.abspath(__file__)), "..",
"Data", "cmudict-0.7b.mapping")
vocab = [w.strip() for w in open(vocab_path).readlines()]
i2w = {i: ch for i, ch in enumerate(vocab)}
# Get minibatches of sequences to train with and perform model training
i = 0
mbs = 0
minibatch_size = 72
epoch_size = 908241
max_epochs = 10
training_progress_output_freq = 500
# make things more basic for running a quicker test
if run_test:
epoch_size = 5000
max_epochs = 1
training_progress_output_freq = 30
valid_reader = create_reader(valid_path, False, input_vocab_dim,
label_vocab_dim)
valid_bind = {
find_arg_by_name('raw_input', ng): valid_reader.streams.features,
find_arg_by_name('raw_labels', ng): valid_reader.streams.labels
}
for epoch in range(max_epochs):
loss_numer = 0
metric_numer = 0
denom = 0
while i < (epoch + 1) * epoch_size:
# get next minibatch of training data
mb_train = train_reader.next_minibatch(minibatch_size,
input_map=train_bind)
trainer.train_minibatch(mb_train)
# collect epoch-wide stats
samples = trainer.previous_minibatch_sample_count
loss_numer += trainer.previous_minibatch_loss_average * samples
metric_numer += trainer.previous_minibatch_evaluation_average * samples
denom += samples
# every N MBs evaluate on a test sequence to visually show how we're doing
if mbs % training_progress_output_freq == 0:
mb_valid = valid_reader.next_minibatch(minibatch_size,
input_map=valid_bind)
e = ng.eval(mb_valid)
print_sequences(e, i2w)
print_training_progress(trainer, mbs,
training_progress_output_freq)
i += mb_train[raw_labels].num_samples
mbs += 1
print("--- EPOCH %d DONE: loss = %f, errs = %f ---" %
(epoch, loss_numer / denom, 100.0 * (metric_numer / denom)))
error1 = translator_test_error(z, trainer, input_vocab_dim,
label_vocab_dim)
z.save_model("seq2seq.dnn")
z.restore_model("seq2seq.dnn")
label_seq_axis = Axis('labelAxis')
label_sequence = sequence.slice(find_arg_by_name('raw_labels', z), 1, 0)
ce = cross_entropy_with_softmax(z, label_sequence)
errs = classification_error(z, label_sequence)
trainer = Trainer(z, ce, errs, [
momentum_sgd(z.parameters, lr_per_minibatch, momentum_time_constant,
True, clipping_threshold_per_sample,
gradient_clipping_with_truncation)
])
error2 = translator_test_error(z, trainer, input_vocab_dim,
label_vocab_dim)
assert error1 == error2
return error1
def eval_faster_rcnn(eval_model,
imgPath,
img_shape,
results_base_path,
feature_node_name,
classes,
mode,
drawUnregressedRois=False,
drawNegativeRois=False,
nmsThreshold=0.5,
nmsConfThreshold=0.0,
bgrPlotThreshold=0.8):
# prepare model
image_input = input_variable(img_shape,
dynamic_axes=[Axis.default_batch_axis()],
name=feature_node_name)
dims_input = input_variable((1, 6),
dynamic_axes=[Axis.default_batch_axis()],
name='dims_input')
# if your model hasn't been loaded proper or in the proper place this is the line to look at. This line takes a model and loads it
# in preparation for the evaluation
try:
frcn_eval = eval_model(image_input, dims_input)
except:
raise TypeError("Loading existing model from %s" % model_path)
print("Plotting results from Faster R-CNN model for image.")
_, cntk_img_input, dims = load_resize_and_pad(imgPath, img_shape[2],
img_shape[1])
dims_input = np.array(dims, dtype=np.float32)
dims_input.shape = (1, ) + dims_input.shape
output = frcn_eval.eval({
frcn_eval.arguments[0]: [cntk_img_input],
frcn_eval.arguments[1]: dims_input
})
out_dict = dict([(k.name, k) for k in output])
out_cls_pred = output[out_dict['cls_pred']][0]
out_rpn_rois = output[out_dict['rpn_rois']][0]
out_bbox_regr = output[out_dict['bbox_regr']][0]
labels = out_cls_pred.argmax(axis=1)
scores = out_cls_pred.max(axis=1).tolist()
if mode == "returntags":
class Tag(object):
def __init__(self, label, score, bbox):
self.label = label
self.score = score
self.bbox = bbox
def serialize(self):
return {
'label': self.label,
'score': self.score,
'bbox': self.bbox,
}
results = []
for i in range(len(out_rpn_rois)):
if labels[i] != 0:
x = Tag(str(classes[labels[i]]), str(scores[i]),
str(out_rpn_rois[i]))
results.append(x)
return results
elif mode == "returnimage":
evaluated_image_path = "{}/{}".format(
results_base_path, 'evaluated_' + os.path.basename(imgPath))
if drawUnregressedRois:
# plot results without final regression
imgDebug = visualizeResultsFaster(
imgPath,
labels,
scores,
out_rpn_rois,
img_shape[2],
img_shape[1],
classes,
nmsKeepIndices=None,
boDrawNegativeRois=drawNegativeRois,
decisionThreshold=bgrPlotThreshold)
imsave(evaluated_image_path, imgDebug)
else:
# apply regression and nms to bbox coordinates
regressed_rois = regress_rois(out_rpn_rois, out_bbox_regr, labels,
dims)
nmsKeepIndices = apply_nms_to_single_image_results(
regressed_rois,
labels,
scores,
nms_threshold=nmsThreshold,
conf_threshold=nmsConfThreshold)
img = visualizeResultsFaster(imgPath,
labels,
scores,
regressed_rois,
img_shape[2],
img_shape[1],
classes,
nmsKeepIndices=nmsKeepIndices,
boDrawNegativeRois=drawNegativeRois,
decisionThreshold=bgrPlotThreshold)
imsave(evaluated_image_path, img)
return evaluated_image_path
else:
raise ValueError("Unsupported value found in 'mode' parameter")
# define the reader #
########################
def create_reader(path, is_training):
return MinibatchSource(CTFDeserializer(path, StreamDefs(
features = StreamDef(field='S0', shape=input_vocab_dim, is_sparse=True),
labels = StreamDef(field='S1', shape=label_vocab_dim, is_sparse=True)
)), randomize = is_training, max_sweeps = INFINITELY_REPEAT if is_training else 1)
########################
# define the model #
########################
# type annotations for the two sequence types; later use InputSequence[Tensor[input_vocab_dim]]
# CNTK considers these two different types since they run over different sequence indices.
inputAxis = Axis('inputAxis')
labelAxis = Axis('labelAxis')
InputSequence = SequenceOver[inputAxis]
LabelSequence = SequenceOver[labelAxis]
# create the s2s model
def create_model(): # :: (history*, input*) -> logP(w)*
# Embedding: (input*) --> embedded_input*
# Right now assumes shared embedding and shared vocab size.
embed = Embedding(embedding_dim, name='embed') if use_embedding else identity
# Encoder: (input*) --> (h0, c0)
# Create multiple layers of LSTMs by passing the output of the i-th layer
# to the (i+1)th layer as its input
# This is the plain s2s encoder. The attention encoder will keep the entire sequence instead.
# Note: We go_backwards for the plain model, but forward for the attention model.
def create_network(input_vocab_dim, label_vocab_dim):
# network complexity; initially low for faster testing
hidden_dim = 256
num_layers = 1
# Source and target inputs to the model
batch_axis = Axis.default_batch_axis()
input_seq_axis = Axis('inputAxis')
label_seq_axis = Axis('labelAxis')
input_dynamic_axes = [batch_axis, input_seq_axis]
raw_input = input_variable(
shape=(input_vocab_dim), dynamic_axes=input_dynamic_axes, name='raw_input')
label_dynamic_axes = [batch_axis, label_seq_axis]
raw_labels = input_variable(
shape=(label_vocab_dim), dynamic_axes=label_dynamic_axes, name='raw_labels')
# Instantiate the sequence to sequence translation model
input_sequence = raw_input
# Drop the sentence start token from the label, for decoder training
label_sequence = sequence.slice(raw_labels, 1, 0) # <s> A B C </s> --> A B C </s>
label_sentence_start = sequence.first(raw_labels) # <s>
is_first_label = sequence.is_first(label_sequence) # <s> 0 0 0 ...
label_sentence_start_scattered = sequence.scatter(
label_sentence_start, is_first_label)
# Encoder
encoder_outputH = stabilize(input_sequence)
for i in range(0, num_layers):
(encoder_outputH, encoder_outputC) = LSTMP_component_with_self_stabilization(
encoder_outputH.output, hidden_dim, hidden_dim, future_value, future_value)
thought_vectorH = sequence.first(encoder_outputH)
thought_vectorC = sequence.first(encoder_outputC)
thought_vector_broadcastH = sequence.broadcast_as(
thought_vectorH, label_sequence)
thought_vector_broadcastC = sequence.broadcast_as(
thought_vectorC, label_sequence)
# Decoder
decoder_history_hook = alias(label_sequence, name='decoder_history_hook') # copy label_sequence
decoder_input = element_select(is_first_label, label_sentence_start_scattered, past_value(
decoder_history_hook))
decoder_outputH = stabilize(decoder_input)
for i in range(0, num_layers):
if (i > 0):
recurrence_hookH = past_value
recurrence_hookC = past_value
else:
isFirst = sequence.is_first(label_sequence)
recurrence_hookH = lambda operand: element_select(
isFirst, thought_vector_broadcastH, past_value(operand))
recurrence_hookC = lambda operand: element_select(
isFirst, thought_vector_broadcastC, past_value(operand))
(decoder_outputH, encoder_outputC) = LSTMP_component_with_self_stabilization(
decoder_outputH.output, hidden_dim, hidden_dim, recurrence_hookH, recurrence_hookC)
decoder_output = decoder_outputH
# Softmax output layer
z = linear_layer(stabilize(decoder_output), label_vocab_dim)
# Criterion nodes
ce = cross_entropy_with_softmax(z, label_sequence)
errs = classification_error(z, label_sequence)
# network output for decoder history
net_output = hardmax(z)
# make a clone of the graph where the ground truth is replaced by the network output
ng = z.clone(CloneMethod.share, {decoder_history_hook.output : net_output.output})
return {
'raw_input' : raw_input,
'raw_labels' : raw_labels,
'ce' : ce,
'pe' : errs,
'ng' : ng,
'output': z
}
def eval_faster_rcnn_mAP(eval_model):
img_map_file = globalvars['test_map_file']
roi_map_file = globalvars['test_roi_file']
classes = globalvars['classes']
image_input = input_variable((num_channels, image_height, image_width),
dynamic_axes=[Axis.default_batch_axis()],
name=feature_node_name)
roi_input = input_variable((cfg["CNTK"].INPUT_ROIS_PER_IMAGE, 5),
dynamic_axes=[Axis.default_batch_axis()])
dims_input = input_variable((6), dynamic_axes=[Axis.default_batch_axis()])
frcn_eval = eval_model(image_input, dims_input)
# Create the minibatch source
minibatch_source = ObjectDetectionMinibatchSource(
img_map_file,
roi_map_file,
max_annotations_per_image=cfg["CNTK"].INPUT_ROIS_PER_IMAGE,
pad_width=image_width,
pad_height=image_height,
pad_value=img_pad_value,
randomize=False,
use_flipping=False,
max_images=cfg["CNTK"].NUM_TEST_IMAGES)
# define mapping from reader streams to network inputs
input_map = {
minibatch_source.image_si: image_input,
minibatch_source.roi_si: roi_input,
minibatch_source.dims_si: dims_input
}
# all detections are collected into:
# all_boxes[cls][image] = N x 5 array of detections in
# (x1, y1, x2, y2, score)
all_boxes = [[[] for _ in range(num_test_images)]
for _ in range(globalvars['num_classes'])]
# evaluate test images and write netwrok output to file
print("Evaluating Faster R-CNN model for %s images." % num_test_images)
all_gt_infos = {key: [] for key in classes}
for img_i in range(0, num_test_images):
mb_data = minibatch_source.next_minibatch(1, input_map=input_map)
gt_row = mb_data[roi_input].asarray()
gt_row = gt_row.reshape((cfg["CNTK"].INPUT_ROIS_PER_IMAGE, 5))
all_gt_boxes = gt_row[np.where(gt_row[:, -1] > 0)]
for cls_index, cls_name in enumerate(classes):
if cls_index == 0: continue
cls_gt_boxes = all_gt_boxes[np.where(
all_gt_boxes[:, -1] == cls_index)]
all_gt_infos[cls_name].append({
'bbox':
np.array(cls_gt_boxes),
'difficult': [False] * len(cls_gt_boxes),
'det': [False] * len(cls_gt_boxes)
})
output = frcn_eval.eval({
image_input: mb_data[image_input],
dims_input: mb_data[dims_input]
})
out_dict = dict([(k.name, k) for k in output])
out_cls_pred = output[out_dict['cls_pred']][0]
out_rpn_rois = output[out_dict['rpn_rois']][0]
out_bbox_regr = output[out_dict['bbox_regr']][0]
labels = out_cls_pred.argmax(axis=1)
scores = out_cls_pred.max(axis=1)
regressed_rois = regress_rois(out_rpn_rois, out_bbox_regr, labels,
mb_data[dims_input].asarray())
labels.shape = labels.shape + (1, )
scores.shape = scores.shape + (1, )
coords_score_label = np.hstack((regressed_rois, scores, labels))
# shape of all_boxes: e.g. 21 classes x 4952 images x 58 rois x 5 coords+score
for cls_j in range(1, globalvars['num_classes']):
coords_score_label_for_cls = coords_score_label[np.where(
coords_score_label[:, -1] == cls_j)]
all_boxes[cls_j][
img_i] = coords_score_label_for_cls[:, :-1].astype(np.float32,
copy=False)
if (img_i + 1) % 100 == 0:
print("Processed {} samples".format(img_i + 1))
# calculate mAP
aps = evaluate_detections(
all_boxes,
all_gt_infos,
classes,
nms_threshold=cfg["CNTK"].RESULTS_NMS_THRESHOLD,
conf_threshold=cfg["CNTK"].RESULTS_NMS_CONF_THRESHOLD)
ap_list = []
for class_name in aps:
ap_list += [aps[class_name]]
print('AP for {:>15} = {:.4f}'.format(class_name, aps[class_name]))
meanAP = np.nanmean(ap_list)
print('Mean AP = {:.4f}'.format(meanAP))
return meanAP
def train_faster_rcnn_alternating(base_model_file_name, debug_output=False):
'''
4-Step Alternating Training scheme from the Faster R-CNN paper:
# Create initial network, only rpn, without detection network
# --> train only the rpn (and conv3_1 and up for VGG16)
# buffer region proposals from rpn
# Create full network, initialize conv layers with imagenet, use buffered proposals
# --> train only detection network (and conv3_1 and up for VGG16)
# Keep conv weights from detection network and fix them
# --> train only rpn
# buffer region proposals from rpn
# Keep conv and rpn weights from step 3 and fix them
# --> train only detection network
'''
# Learning parameters
rpn_lr_factor = globalvars['rpn_lr_factor']
rpn_lr_per_sample_scaled = [
x * rpn_lr_factor for x in cfg["CNTK"].RPN_LR_PER_SAMPLE
]
frcn_lr_factor = globalvars['frcn_lr_factor']
frcn_lr_per_sample_scaled = [
x * frcn_lr_factor for x in cfg["CNTK"].FRCN_LR_PER_SAMPLE
]
l2_reg_weight = cfg["CNTK"].L2_REG_WEIGHT
mm_schedule = momentum_schedule(globalvars['momentum_per_mb'])
rpn_epochs = globalvars['rpn_epochs']
frcn_epochs = globalvars['frcn_epochs']
print("Using base model: {}".format(cfg["CNTK"].BASE_MODEL))
print("rpn_lr_per_sample: {}".format(rpn_lr_per_sample_scaled))
print("frcn_lr_per_sample: {}".format(frcn_lr_per_sample_scaled))
if debug_output:
print("Storing graphs and models to %s." % globalvars['output_path'])
# Input variables denoting features, labeled ground truth rois (as 5-tuples per roi) and image dimensions
image_input = input_variable((num_channels, image_height, image_width),
dynamic_axes=[Axis.default_batch_axis()],
name=feature_node_name)
feat_norm = image_input - normalization_const
roi_input = input_variable((cfg["CNTK"].INPUT_ROIS_PER_IMAGE, 5),
dynamic_axes=[Axis.default_batch_axis()])
scaled_gt_boxes = alias(roi_input, name='roi_input')
dims_input = input_variable((6), dynamic_axes=[Axis.default_batch_axis()])
dims_node = alias(dims_input, name='dims_input')
rpn_rois_input = input_variable((cfg["TRAIN"].RPN_POST_NMS_TOP_N, 4),
dynamic_axes=[Axis.default_batch_axis()])
rpn_rois_buf = alias(rpn_rois_input, name='rpn_rois')
# base image classification model (e.g. VGG16 or AlexNet)
base_model = load_model(base_model_file_name)
print("stage 1a - rpn")
if True:
# Create initial network, only rpn, without detection network
# initial weights train?
# conv: base_model only conv3_1 and up
# rpn: init new yes
# frcn: - -
# conv layers
conv_layers = clone_conv_layers(base_model)
conv_out = conv_layers(feat_norm)
# RPN and losses
rpn_rois, rpn_losses = create_rpn(
conv_out,
scaled_gt_boxes,
dims_node,
proposal_layer_param_string=cfg["CNTK"].PROPOSAL_LAYER_PARAMS)
stage1_rpn_network = combine([rpn_rois, rpn_losses])
# train
if debug_output:
plot(
stage1_rpn_network,
os.path.join(
globalvars['output_path'],
"graph_frcn_train_stage1a_rpn." + cfg["CNTK"].GRAPH_TYPE))
train_model(image_input,
roi_input,
dims_input,
rpn_losses,
rpn_losses,
rpn_lr_per_sample_scaled,
mm_schedule,
l2_reg_weight,
epochs_to_train=rpn_epochs)
print("stage 1a - buffering rpn proposals")
buffered_proposals_s1 = compute_rpn_proposals(stage1_rpn_network,
image_input, roi_input,
dims_input)
print("stage 1b - frcn")
if True:
# Create full network, initialize conv layers with imagenet, fix rpn weights
# initial weights train?
# conv: base_model only conv3_1 and up
# rpn: stage1a rpn model no --> use buffered proposals
# frcn: base_model + new yes
# conv_layers
conv_layers = clone_conv_layers(base_model)
conv_out = conv_layers(feat_norm)
# use buffered proposals in target layer
rois, label_targets, bbox_targets, bbox_inside_weights = \
create_proposal_target_layer(rpn_rois_buf, scaled_gt_boxes, num_classes=globalvars['num_classes'])
# Fast RCNN and losses
fc_layers = clone_model(base_model, [pool_node_name],
[last_hidden_node_name], CloneMethod.clone)
cls_score, bbox_pred = create_fast_rcnn_predictor(
conv_out, rois, fc_layers)
detection_losses = create_detection_losses(cls_score, label_targets,
rois, bbox_pred,
bbox_targets,
bbox_inside_weights)
pred_error = classification_error(cls_score,
label_targets,
axis=1,
name="pred_error")
stage1_frcn_network = combine(
[rois, cls_score, bbox_pred, detection_losses, pred_error])
# train
if debug_output:
plot(
stage1_frcn_network,
os.path.join(
globalvars['output_path'],
"graph_frcn_train_stage1b_frcn." + cfg["CNTK"].GRAPH_TYPE))
train_model(image_input,
roi_input,
dims_input,
detection_losses,
pred_error,
frcn_lr_per_sample_scaled,
mm_schedule,
l2_reg_weight,
epochs_to_train=frcn_epochs,
rpn_rois_input=rpn_rois_input,
buffered_rpn_proposals=buffered_proposals_s1)
buffered_proposals_s1 = None
print("stage 2a - rpn")
if True:
# Keep conv weights from detection network and fix them
# initial weights train?
# conv: stage1b frcn model no
# rpn: stage1a rpn model yes
# frcn: - -
# conv_layers
conv_layers = clone_model(stage1_frcn_network, [feature_node_name],
[last_conv_node_name], CloneMethod.freeze)
conv_out = conv_layers(image_input)
# RPN and losses
rpn = clone_model(stage1_rpn_network,
[last_conv_node_name, "roi_input", "dims_input"],
["rpn_rois", "rpn_losses"], CloneMethod.clone)
rpn_net = rpn(conv_out, dims_node, scaled_gt_boxes)
rpn_rois = rpn_net.outputs[0]
rpn_losses = rpn_net.outputs[1]
stage2_rpn_network = combine([rpn_rois, rpn_losses])
# train
if debug_output:
plot(
stage2_rpn_network,
os.path.join(
globalvars['output_path'],
"graph_frcn_train_stage2a_rpn." + cfg["CNTK"].GRAPH_TYPE))
train_model(image_input,
roi_input,
dims_input,
rpn_losses,
rpn_losses,
rpn_lr_per_sample_scaled,
mm_schedule,
l2_reg_weight,
epochs_to_train=rpn_epochs)
print("stage 2a - buffering rpn proposals")
buffered_proposals_s2 = compute_rpn_proposals(stage2_rpn_network,
image_input, roi_input,
dims_input)
print("stage 2b - frcn")
if True:
# Keep conv and rpn weights from step 3 and fix them
# initial weights train?
# conv: stage2a rpn model no
# rpn: stage2a rpn model no --> use buffered proposals
# frcn: stage1b frcn model yes -
# conv_layers
conv_layers = clone_model(stage2_rpn_network, [feature_node_name],
[last_conv_node_name], CloneMethod.freeze)
conv_out = conv_layers(image_input)
# Fast RCNN and losses
frcn = clone_model(stage1_frcn_network,
[last_conv_node_name, "rpn_rois", "roi_input"], [
"cls_score", "bbox_regr", "rpn_target_rois",
"detection_losses", "pred_error"
], CloneMethod.clone)
stage2_frcn_network = frcn(conv_out, rpn_rois_buf, scaled_gt_boxes)
detection_losses = stage2_frcn_network.outputs[3]
pred_error = stage2_frcn_network.outputs[4]
# train
if debug_output:
plot(
stage2_frcn_network,
os.path.join(
globalvars['output_path'],
"graph_frcn_train_stage2b_frcn." + cfg["CNTK"].GRAPH_TYPE))
train_model(image_input,
roi_input,
dims_input,
detection_losses,
pred_error,
frcn_lr_per_sample_scaled,
mm_schedule,
l2_reg_weight,
epochs_to_train=frcn_epochs,
rpn_rois_input=rpn_rois_input,
buffered_rpn_proposals=buffered_proposals_s2)
buffered_proposals_s2 = None
return create_eval_model(stage2_frcn_network,
image_input,
dims_input,
rpn_model=stage2_rpn_network)
def sequence_to_sequence_translator(debug_output=False):
input_vocab_dim = 69
label_vocab_dim = 69
hidden_dim = 512
num_layers = 2
# Source and target inputs to the model
batch_axis = Axis.default_batch_axis()
input_seq_axis = Axis('inputAxis')
label_seq_axis = Axis('labelAxis')
input_dynamic_axes = [batch_axis, input_seq_axis]
raw_input = input_variable(shape=(input_vocab_dim),
dynamic_axes=input_dynamic_axes)
label_dynamic_axes = [batch_axis, label_seq_axis]
raw_labels = input_variable(shape=(label_vocab_dim),
dynamic_axes=label_dynamic_axes)
# Instantiate the sequence to sequence translation model
input_sequence = raw_input
# Drop the sentence start token from the label, for decoder training
label_sequence = slice(raw_labels, label_seq_axis, 1, 0)
label_sentence_start = sequence.first(raw_labels)
is_first_label = sequence.is_first(label_sequence)
label_sentence_start_scattered = sequence.scatter(label_sentence_start,
is_first_label)
# Encoder
encoder_outputH = stabilize(input_sequence)
for i in range(0, num_layers):
(encoder_outputH,
encoder_outputC) = LSTMP_component_with_self_stabilization(
encoder_outputH.output(), hidden_dim, hidden_dim, future_value,
future_value)
thought_vectorH = sequence.first(encoder_outputH)
thought_vectorC = sequence.first(encoder_outputC)
thought_vector_broadcastH = sequence.broadcast_as(thought_vectorH,
label_sequence)
thought_vector_broadcastC = sequence.broadcast_as(thought_vectorC,
label_sequence)
# Decoder
decoder_history_from_ground_truth = label_sequence
decoder_input = element_select(
is_first_label, label_sentence_start_scattered,
past_value(decoder_history_from_ground_truth))
decoder_outputH = stabilize(decoder_input)
for i in range(0, num_layers):
if (i > 0):
recurrence_hookH = past_value
recurrence_hookC = past_value
else:
isFirst = sequence.is_first(label_sequence)
recurrence_hookH = lambda operand: element_select(
isFirst, thought_vector_broadcastH, past_value(operand))
recurrence_hookC = lambda operand: element_select(
isFirst, thought_vector_broadcastC, past_value(operand))
(decoder_outputH,
encoder_outputC) = LSTMP_component_with_self_stabilization(
decoder_outputH.output(), hidden_dim, hidden_dim,
recurrence_hookH, recurrence_hookC)
decoder_output = decoder_outputH
decoder_dim = hidden_dim
# Softmax output layer
z = linear_layer(stabilize(decoder_output), label_vocab_dim)
ce = cross_entropy_with_softmax(z, label_sequence)
errs = classification_error(z, label_sequence)
# Instantiate the trainer object to drive the model training
lr = 0.007
momentum_time_constant = 1100
momentum_per_sample = momentums_per_sample(
math.exp(-1.0 / momentum_time_constant))
clipping_threshold_per_sample = 2.3
gradient_clipping_with_truncation = True
trainer = Trainer(z, ce, errs, [
momentum_sgd(z.parameters(), lr, momentum_per_sample,
clipping_threshold_per_sample,
gradient_clipping_with_truncation)
])
rel_path = r"../../../../Examples/SequenceToSequence/CMUDict/Data/cmudict-0.7b.train-dev-20-21.ctf"
path = os.path.join(os.path.dirname(os.path.abspath(__file__)), rel_path)
feature_stream_name = 'features'
labels_stream_name = 'labels'
mb_source = text_format_minibatch_source(path, [
StreamConfiguration(feature_stream_name, input_vocab_dim, True, 'S0'),
StreamConfiguration(labels_stream_name, label_vocab_dim, True, 'S1')
], 10000)
features_si = mb_source[feature_stream_name]
labels_si = mb_source[labels_stream_name]
# Get minibatches of sequences to train with and perform model training
minibatch_size = 72
training_progress_output_freq = 30
if debug_output:
training_progress_output_freq = training_progress_output_freq / 3
while True:
mb = mb_source.get_next_minibatch(minibatch_size)
if len(mb) == 0:
break
# Specify the mapping of input variables in the model to actual
# minibatch data to be trained with
arguments = {raw_input: mb[features_si], raw_labels: mb[labels_si]}
trainer.train_minibatch(arguments)
print_training_progress(trainer, i, training_progress_output_freq)
i += 1
rel_path = r"../../../../Examples/SequenceToSequence/CMUDict/Data/cmudict-0.7b.test.ctf"
path = os.path.join(os.path.dirname(os.path.abspath(__file__)), rel_path)
test_mb_source = text_format_minibatch_source(path, [
StreamConfiguration(feature_stream_name, input_vocab_dim, True, 'S0'),
StreamConfiguration(labels_stream_name, label_vocab_dim, True, 'S1')
], 10000, False)
features_si = test_mb_source[feature_stream_name]
labels_si = test_mb_source[labels_stream_name]
# choose this to be big enough for the longest sentence
train_minibatch_size = 1024
# Get minibatches of sequences to test and perform testing
i = 0
total_error = 0.0
while True:
mb = test_mb_source.get_next_minibatch(train_minibatch_size)
if len(mb) == 0:
break
# Specify the mapping of input variables in the model to actual
# minibatch data to be tested with
arguments = {raw_input: mb[features_si], raw_labels: mb[labels_si]}
mb_error = trainer.test_minibatch(arguments)
total_error += mb_error
if debug_output:
print("Minibatch {}, Error {} ".format(i, mb_error))
i += 1
# Average of evaluation errors of all test minibatches
return total_error / i
def eval_and_plot_faster_rcnn(eval_model, num_images_to_plot, test_map_file, img_shape,
results_base_path, feature_node_name, classes,
drawUnregressedRois=False, drawNegativeRois=False,
nmsThreshold=0.5, nmsConfThreshold=0.0, bgrPlotThreshold = 0.8):
# get image paths
with open(test_map_file) as f:
content = f.readlines()
img_base_path = os.path.dirname(os.path.abspath(test_map_file))
img_file_names = [os.path.join(img_base_path, x.split('\t')[1]) for x in content]
# prepare model
image_input = input_variable(img_shape, dynamic_axes=[Axis.default_batch_axis()], name=feature_node_name)
dims_input = input_variable((1,6), dynamic_axes=[Axis.default_batch_axis()], name='dims_input')
frcn_eval = eval_model(image_input, dims_input)
#dims_input_const = cntk.constant([image_width, image_height, image_width, image_height, image_width, image_height], (1, 6))
print("Plotting results from Faster R-CNN model for %s images." % num_images_to_plot)
for i in range(0, num_images_to_plot):
imgPath = img_file_names[i]
# evaluate single image
_, cntk_img_input, dims = load_resize_and_pad(imgPath, img_shape[2], img_shape[1])
dims_input = np.array(dims, dtype=np.float32)
dims_input.shape = (1,) + dims_input.shape
output = frcn_eval.eval({frcn_eval.arguments[0]: [cntk_img_input], frcn_eval.arguments[1]: dims_input})
out_dict = dict([(k.name, k) for k in output])
out_cls_pred = output[out_dict['cls_pred']][0]
out_rpn_rois = output[out_dict['rpn_rois']][0]
out_bbox_regr = output[out_dict['bbox_regr']][0]
labels = out_cls_pred.argmax(axis=1)
scores = out_cls_pred.max(axis=1).tolist()
if drawUnregressedRois:
# plot results without final regression
imgDebug = visualizeResultsFaster(imgPath, labels, scores, out_rpn_rois, img_shape[2], img_shape[1],
classes, nmsKeepIndices=None, boDrawNegativeRois=drawNegativeRois,
decisionThreshold=bgrPlotThreshold)
imsave("{}/{}_{}".format(results_base_path, i, os.path.basename(imgPath)), imgDebug)
# apply regression and nms to bbox coordinates
regressed_rois = regress_rois(out_rpn_rois, out_bbox_regr, labels, dims)
nmsKeepIndices = apply_nms_to_single_image_results(regressed_rois, labels, scores,
nms_threshold=nmsThreshold,
conf_threshold=nmsConfThreshold)
# filtered_bboxes = regressed_rois[nmsKeepIndices]
# # print(filtered_bboxes)
# filtered_labels = labels[nmsKeepIndices]
# filtered_scores = scores[nmsKeepIndices]
img = visualizeResultsFaster(imgPath, labels, scores, regressed_rois, img_shape[2], img_shape[1],
classes, nmsKeepIndices=nmsKeepIndices,
boDrawNegativeRois=drawNegativeRois,
decisionThreshold=bgrPlotThreshold)
# img = visualizeResultsFaster(imgPath,filtered_lables, filtered_scores, regressed_filtered_bboxes, img_shape[2], img_shape[1],
# classes, nmsKeepIndices=nmsKeepIndices,
# boDrawNegativeRois=drawNegativeRois,
# decisionThreshold=bgrPlotThreshold)
imsave("{}/{}_regr_{}".format(results_base_path, i, os.path.basename(imgPath)), img)
def sequence_to_sequence_translator(debug_output=False, run_test=False):
input_vocab_dim = 69
label_vocab_dim = 69
# network complexity; initially low for faster testing
hidden_dim = 256
num_layers = 1
# Source and target inputs to the model
batch_axis = Axis.default_batch_axis()
input_seq_axis = Axis('inputAxis')
label_seq_axis = Axis('labelAxis')
input_dynamic_axes = [batch_axis, input_seq_axis]
raw_input = input_variable(
shape=(input_vocab_dim), dynamic_axes=input_dynamic_axes, name='raw_input')
label_dynamic_axes = [batch_axis, label_seq_axis]
raw_labels = input_variable(
shape=(label_vocab_dim), dynamic_axes=label_dynamic_axes, name='raw_labels')
# Instantiate the sequence to sequence translation model
input_sequence = raw_input
# Drop the sentence start token from the label, for decoder training
label_sequence = slice(raw_labels, label_seq_axis, 1, 0) # <s> A B C </s> --> A B C </s>
label_sentence_start = sequence.first(raw_labels) # <s>
is_first_label = sequence.is_first(label_sequence) # <s> 0 0 0 ...
label_sentence_start_scattered = sequence.scatter(
label_sentence_start, is_first_label)
# Encoder
encoder_outputH = stabilize(input_sequence)
for i in range(0, num_layers):
(encoder_outputH, encoder_outputC) = LSTMP_component_with_self_stabilization(
encoder_outputH.output, hidden_dim, hidden_dim, future_value, future_value)
thought_vectorH = sequence.first(encoder_outputH)
thought_vectorC = sequence.first(encoder_outputC)
thought_vector_broadcastH = sequence.broadcast_as(
thought_vectorH, label_sequence)
thought_vector_broadcastC = sequence.broadcast_as(
thought_vectorC, label_sequence)
# Decoder
decoder_history_hook = alias(label_sequence, name='decoder_history_hook') # copy label_sequence
decoder_input = element_select(is_first_label, label_sentence_start_scattered, past_value(
decoder_history_hook))
decoder_outputH = stabilize(decoder_input)
for i in range(0, num_layers):
if (i > 0):
recurrence_hookH = past_value
recurrence_hookC = past_value
else:
isFirst = sequence.is_first(label_sequence)
recurrence_hookH = lambda operand: element_select(
isFirst, thought_vector_broadcastH, past_value(operand))
recurrence_hookC = lambda operand: element_select(
isFirst, thought_vector_broadcastC, past_value(operand))
(decoder_outputH, encoder_outputC) = LSTMP_component_with_self_stabilization(
decoder_outputH.output, hidden_dim, hidden_dim, recurrence_hookH, recurrence_hookC)
decoder_output = decoder_outputH
# Softmax output layer
z = linear_layer(stabilize(decoder_output), label_vocab_dim)
# Criterion nodes
ce = cross_entropy_with_softmax(z, label_sequence)
errs = classification_error(z, label_sequence)
# network output for decoder history
net_output = hardmax(z)
# make a clone of the graph where the ground truth is replaced by the network output
ng = z.clone(CloneMethod.share, {decoder_history_hook.output : net_output.output})
# Instantiate the trainer object to drive the model training
lr = 0.007
minibatch_size = 72
momentum_time_constant = 1100
m_schedule = momentum_schedule(momentum_time_constant)
clipping_threshold_per_sample = 2.3
gradient_clipping_with_truncation = True
trainer = Trainer(z, ce, errs, [momentum_sgd(
z.parameters, lr, m_schedule, clipping_threshold_per_sample, gradient_clipping_with_truncation)])
# setup data
rel_path = r"../../../../Examples/SequenceToSequence/CMUDict/Data/cmudict-0.7b.train-dev-20-21.ctf"
train_path = os.path.join(os.path.dirname(os.path.abspath(__file__)), rel_path)
valid_path = os.path.join(os.path.dirname(os.path.abspath(__file__)), "tiny.ctf")
feature_stream_name = 'features'
labels_stream_name = 'labels'
# readers
randomize_data = True
if run_test:
randomize_data = False # because we want to get an exact error
train_reader = text_format_minibatch_source(train_path, [
StreamConfiguration(feature_stream_name, input_vocab_dim, True, 'S0'),
StreamConfiguration(labels_stream_name, label_vocab_dim, True, 'S1')
], randomize=randomize_data)
features_si_tr = train_reader.stream_info(feature_stream_name)
labels_si_tr = train_reader.stream_info(labels_stream_name)
valid_reader = text_format_minibatch_source(valid_path, [
StreamConfiguration(feature_stream_name, input_vocab_dim, True, 'S0'),
StreamConfiguration(labels_stream_name, label_vocab_dim, True, 'S1')
], randomize=False)
features_si_va = valid_reader.stream_info(feature_stream_name)
labels_si_va = valid_reader.stream_info(labels_stream_name)
# get the vocab for printing output sequences in plaintext
rel_path = r"../../../../Examples/SequenceToSequence/CMUDict/Data/cmudict-0.7b.mapping"
vocab_path = os.path.join(os.path.dirname(os.path.abspath(__file__)), rel_path)
vocab = [w.strip() for w in open(vocab_path).readlines()]
i2w = { i:ch for i,ch in enumerate(vocab) }
# Get minibatches of sequences to train with and perform model training
i = 0
mbs = 0
epoch_size = 908241
max_epochs = 10
training_progress_output_freq = 500
# make things more basic for running a quicker test
if run_test:
epoch_size = 5000
max_epochs = 1
training_progress_output_freq = 30
for epoch in range(max_epochs):
loss_numer = 0
metric_numer = 0
denom = 0
while i < (epoch+1) * epoch_size:
# get next minibatch of training data
mb_train = train_reader.next_minibatch(minibatch_size)
train_args = {'raw_input': mb_train[features_si_tr], 'raw_labels': mb_train[labels_si_tr]}
trainer.train_minibatch(train_args)
# collect epoch-wide stats
samples = trainer.previous_minibatch_sample_count
loss_numer += trainer.previous_minibatch_loss_average * samples
metric_numer += trainer.previous_minibatch_evaluation_average * samples
denom += samples
# every N MBs evaluate on a test sequence to visually show how we're doing
if mbs % training_progress_output_freq == 0:
mb_valid = valid_reader.next_minibatch(minibatch_size)
valid_args = {'raw_input': mb_valid[features_si_va], 'raw_labels': mb_valid[labels_si_va]}
e = ng.eval(valid_args)
print_sequences(e, i2w)
print_training_progress(trainer, mbs, training_progress_output_freq)
i += mb_train[labels_si_tr].num_samples
mbs += 1
print("--- EPOCH %d DONE: loss = %f, errs = %f ---" % (epoch, loss_numer/denom, 100.0*(metric_numer/denom)))
# now setup a test run
rel_path = r"../../../../Examples/SequenceToSequence/CMUDict/Data/cmudict-0.7b.test.ctf"
test_path = os.path.join(os.path.dirname(os.path.abspath(__file__)), rel_path)
test_reader = text_format_minibatch_source(test_path, [
StreamConfiguration(feature_stream_name, input_vocab_dim, True, 'S0'),
StreamConfiguration(labels_stream_name, label_vocab_dim, True, 'S1')
], 10000, randomize=False)
features_si_te = test_reader.stream_info(feature_stream_name)
labels_si_te = test_reader.stream_info(labels_stream_name)
test_minibatch_size = 1024
# Get minibatches of sequences to test and perform testing
i = 0
total_error = 0.0
while True:
mb = test_reader.next_minibatch(test_minibatch_size)
if len(mb) == 0:
break
# Specify the mapping of input variables in the model to actual
# minibatch data to be tested with
arguments = {raw_input: mb[features_si_te],
raw_labels: mb[labels_si_te]}
mb_error = trainer.test_minibatch(arguments)
total_error += mb_error
if debug_output:
print("Minibatch {}, Error {} ".format(i, mb_error))
i += 1
# Average of evaluation errors of all test minibatches
return total_error / i
def train_sequence_classifier(device):
input_dim = 2000
cell_dim = 25
hidden_dim = 25
embedding_dim = 50
num_output_classes = 5
features = variable(shape=input_dim, is_sparse=True, name="features")
classifier_output = LSTM_sequence_classifer_net(features,
num_output_classes,
embedding_dim, hidden_dim,
cell_dim, device)
label = variable(num_output_classes,
dynamic_axes=[Axis.default_batch_axis()],
name="labels")
ce = cross_entropy_with_softmax(classifier_output, label)
pe = classification_error(classifier_output, label)
#TODO: add save and load module code
lstm_net = combine([ce, pe, classifier_output], "classifier_model")
rel_path = r"../../../../Tests/EndToEndTests/Text/SequenceClassification/Data/Train.ctf"
path = os.path.join(os.path.dirname(os.path.abspath(__file__)), rel_path)
cm = create_text_mb_source(path, input_dim, num_output_classes, 0, True,
False, "x", "y")
stream_infos = cm.stream_infos()
for si in stream_infos:
if si.m_name == 'features':
features_si = si
elif si.m_name == 'labels':
labels_si = si
minibatch_size = 200
lr = lr = learning_rates_per_sample(0.0005)
trainer = Trainer(classifier_output, ce, pe,
[sgdlearner(classifier_output.owner.parameters(), lr)])
freq = 1
i = 0
cntk_dev = cntk_device(device)
while True:
mb = cm.get_next_minibatch(minibatch_size, cntk_dev)
if len(mb) == 0:
break
arguments = dict()
arguments[features] = mb[features_si].m_data
arguments[label] = mb[labels_si].m_data
trainer.train_minibatch(arguments, cntk_dev)
if i % freq == 0:
training_loss = get_train_loss(trainer)
eval_crit = get_train_eval_criterion(trainer)
print(
"Minibatch: {}, Train Loss: {}, Train Evaluation Criterion: {}"
.format(i, training_loss, eval_crit))
i += 1
def train_sequence_classifier(debug_output=False):
input_dim = 2000
cell_dim = 25
hidden_dim = 25
embedding_dim = 50
num_output_classes = 5
# Input variables denoting the features and label data
features = input_variable(shape=input_dim, is_sparse=True)
label = input_variable(num_output_classes,
dynamic_axes=[Axis.default_batch_axis()])
# Instantiate the sequence classification model
classifier_output = LSTM_sequence_classifer_net(features,
num_output_classes,
embedding_dim, hidden_dim,
cell_dim)
ce = cross_entropy_with_softmax(classifier_output, label)
pe = classification_error(classifier_output, label)
rel_path = r"../../../../Tests/EndToEndTests/Text/SequenceClassification/Data/Train.ctf"
path = os.path.join(os.path.dirname(os.path.abspath(__file__)), rel_path)
feature_stream_name = 'features'
labels_stream_name = 'labels'
mb_source = text_format_minibatch_source(path, [
StreamConfiguration(feature_stream_name, input_dim, True, 'x'),
StreamConfiguration(labels_stream_name, num_output_classes, False, 'y')
], 0)
features_si = mb_source[features]
labels_si = mb_source[label]
# Instantiate the trainer object to drive the model training
trainer = Trainer(classifier_output, ce, pe,
[sgd(classifier_output.parameters(), lr=0.0005)])
# Get minibatches of sequences to train with and perform model training
minibatch_size = 200
training_progress_output_freq = 10
i = 0
if debug_output:
training_progress_output_freq = training_progress_output_freq / 3
while True:
mb = mb_source.get_next_minibatch(minibatch_size)
if len(mb) == 0:
break
# Specify the mapping of input variables in the model to actual
# minibatch data to be trained with
arguments = {features: mb[features_si], label: mb[labels_si]}
trainer.train_minibatch(arguments)
print_training_progress(trainer, i, training_progress_output_freq)
i += 1
import copy
evaluation_average = copy.copy(
trainer.previous_minibatch_evaluation_average())
loss_average = copy.copy(trainer.previous_minibatch_loss_average())
return evaluation_average, loss_average
def test_eval_sparse_dense(tmpdir, device_id):
from cntk import Axis
from cntk.io import MinibatchSource, CTFDeserializer, StreamDef, StreamDefs
from cntk.ops import input_variable, times
input_vocab_dim = label_vocab_dim = 69
ctf_data = '''\
0 |S0 3:1 |# <s> |S1 3:1 |# <s>
0 |S0 4:1 |# A |S1 32:1 |# ~AH
0 |S0 5:1 |# B |S1 36:1 |# ~B
0 |S0 4:1 |# A |S1 31:1 |# ~AE
0 |S0 7:1 |# D |S1 38:1 |# ~D
0 |S0 12:1 |# I |S1 47:1 |# ~IY
0 |S0 1:1 |# </s> |S1 1:1 |# </s>
2 |S0 60:1 |# <s> |S1 3:1 |# <s>
2 |S0 61:1 |# A |S1 32:1 |# ~AH
'''
ctf_file = str(tmpdir / '2seqtest.txt')
with open(ctf_file, 'w') as f:
f.write(ctf_data)
mbs = MinibatchSource(CTFDeserializer(
ctf_file,
StreamDefs(features=StreamDef(field='S0',
shape=input_vocab_dim,
is_sparse=True),
labels=StreamDef(field='S1',
shape=label_vocab_dim,
is_sparse=True))),
randomize=False,
epoch_size=2)
batch_axis = Axis.default_batch_axis()
input_seq_axis = Axis('inputAxis')
label_seq_axis = Axis('labelAxis')
input_dynamic_axes = [batch_axis, input_seq_axis]
raw_input = input_variable(shape=input_vocab_dim,
dynamic_axes=input_dynamic_axes,
name='raw_input',
is_sparse=True)
mb_valid = mbs.next_minibatch(minibatch_size_in_samples=100,
input_map={raw_input: mbs.streams.features},
device=cntk_device(device_id))
z = times(raw_input, np.eye(input_vocab_dim))
e_reader = z.eval(mb_valid, device=cntk_device(device_id))
# CSR with the raw_input encoding in ctf_data
one_hot_data = [[3, 4, 5, 4, 7, 12, 1], [60, 61]]
data = [
csr(np.eye(input_vocab_dim, dtype=np.float32)[d]) for d in one_hot_data
]
e_csr = z.eval({raw_input: data}, device=cntk_device(device_id))
assert np.all([np.allclose(a, b) for a, b in zip(e_reader, e_csr)])
# One-hot with the raw_input encoding in ctf_data
data = one_hot(one_hot_data,
num_classes=input_vocab_dim,
device=cntk_device(device_id))
e_hot = z.eval({raw_input: data}, device=cntk_device(device_id))
assert np.all([np.allclose(a, b) for a, b in zip(e_reader, e_hot)])
ix_to_char = { i:ch for i,ch in enumerate(chars) }
minibatch_size=100
def sample(p):
xi = [char_to_ix[ch] for ch in data[p:p+minibatch_size]]
yi = [char_to_ix[ch] for ch in data[p+1:p+minibatch_size+1]]
X = np.eye(vocab_size, dtype=np.float32)[xi]
Y = np.eye(vocab_size, dtype=np.float32)[yi]
return [X], [Y]
sample(0)
input_seq_axis = Axis('inputAxis')
input_sequence = sequence.input_variable(shape=vocab_size, sequence_axis=input_seq_axis)
label_sequence = sequence.input_variable(shape=vocab_size, sequence_axis=input_seq_axis)
# model = Sequential([Dense(300),Dense(vocab_size)])
model = Sequential([
For(range(2), lambda:
Sequential([Stabilizer(), Recurrence(LSTM(256), go_backwards=False)])),
Dense(vocab_size)])
z = model(input_sequence)
ce = cross_entropy_with_softmax(z, label_sequence)
errs = classification_error(z, label_sequence)
def compute_test_set_aps(eval_model, cfg):
num_test_images = cfg["DATA"].NUM_TEST_IMAGES
classes = cfg["DATA"].CLASSES
image_input = input_variable(shape=(cfg.NUM_CHANNELS, cfg.IMAGE_HEIGHT, cfg.IMAGE_WIDTH),
dynamic_axes=[Axis.default_batch_axis()],
name=cfg["MODEL"].FEATURE_NODE_NAME)
roi_input = input_variable((cfg.INPUT_ROIS_PER_IMAGE, 5), dynamic_axes=[Axis.default_batch_axis()])
roi_proposals = input_variable((cfg.NUM_ROI_PROPOSALS, 4), dynamic_axes=[Axis.default_batch_axis()], name="roi_proposals")
dims_input = input_variable((6), dynamic_axes=[Axis.default_batch_axis()])
frcn_eval = eval_model(image_input, roi_proposals)
# Create the minibatch source
if cfg.USE_PRECOMPUTED_PROPOSALS:
try:
cfg["DATA"].TEST_PRECOMPUTED_PROPOSALS_FILE = os.path.join(cfg["DATA"].MAP_FILE_PATH, cfg["DATA"].TEST_PRECOMPUTED_PROPOSALS_FILE)
proposal_provider = ProposalProvider.fromfile(cfg["DATA"].TEST_PRECOMPUTED_PROPOSALS_FILE, cfg.NUM_ROI_PROPOSALS)
except:
print("To use precomputed proposals please specify the following parameters in your configuration:\n"
"__C.DATA.TRAIN_PRECOMPUTED_PROPOSALS_FILE\n"
"__C.DATA.TEST_PRECOMPUTED_PROPOSALS_FILE")
exit(-1)
else:
proposal_provider = ProposalProvider.fromconfig(cfg)
minibatch_source = ObjectDetectionMinibatchSource(
cfg["DATA"].TEST_MAP_FILE,
cfg["DATA"].TEST_ROI_FILE,
max_annotations_per_image=cfg.INPUT_ROIS_PER_IMAGE,
pad_width=cfg.IMAGE_WIDTH,
pad_height=cfg.IMAGE_HEIGHT,
pad_value=cfg["MODEL"].IMG_PAD_COLOR,
randomize=False, use_flipping=False,
max_images=cfg["DATA"].NUM_TEST_IMAGES,
num_classes=cfg["DATA"].NUM_CLASSES,
proposal_provider=proposal_provider,
provide_targets=False)
# define mapping from reader streams to network inputs
input_map = {
minibatch_source.image_si: image_input,
minibatch_source.roi_si: roi_input,
minibatch_source.proposals_si: roi_proposals,
minibatch_source.dims_si: dims_input
}
# all detections are collected into:
# all_boxes[cls][image] = N x 5 array of detections in (x1, y1, x2, y2, score)
all_boxes = [[[] for _ in range(num_test_images)] for _ in range(cfg["DATA"].NUM_CLASSES)]
# evaluate test images and write netwrok output to file
print("Evaluating Fast R-CNN model for %s images." % num_test_images)
all_gt_infos = {key: [] for key in classes}
for img_i in range(0, num_test_images):
mb_data = minibatch_source.next_minibatch(1, input_map=input_map)
gt_row = mb_data[roi_input].asarray()
gt_row = gt_row.reshape((cfg.INPUT_ROIS_PER_IMAGE, 5))
all_gt_boxes = gt_row[np.where(gt_row[:,-1] > 0)]
for cls_index, cls_name in enumerate(classes):
if cls_index == 0: continue
cls_gt_boxes = all_gt_boxes[np.where(all_gt_boxes[:,-1] == cls_index)]
all_gt_infos[cls_name].append({'bbox': np.array(cls_gt_boxes),
'difficult': [False] * len(cls_gt_boxes),
'det': [False] * len(cls_gt_boxes)})
output = frcn_eval.eval({image_input: mb_data[image_input], roi_proposals: mb_data[roi_proposals]})
out_dict = dict([(k.name, k) for k in output])
out_cls_pred = output[out_dict['cls_pred']][0]
out_rpn_rois = mb_data[roi_proposals].data.asarray()
out_bbox_regr = output[out_dict['bbox_regr']][0]
labels = out_cls_pred.argmax(axis=1)
scores = out_cls_pred.max(axis=1)
regressed_rois = regress_rois(out_rpn_rois, out_bbox_regr, labels, mb_data[dims_input].asarray())
labels.shape = labels.shape + (1,)
scores.shape = scores.shape + (1,)
coords_score_label = np.hstack((regressed_rois, scores, labels))
# shape of all_boxes: e.g. 21 classes x 4952 images x 58 rois x 5 coords+score
for cls_j in range(1, cfg["DATA"].NUM_CLASSES):
coords_score_label_for_cls = coords_score_label[np.where(coords_score_label[:,-1] == cls_j)]
all_boxes[cls_j][img_i] = coords_score_label_for_cls[:,:-1].astype(np.float32, copy=False)
if (img_i+1) % 100 == 0:
print("Processed {} samples".format(img_i+1))
# calculate mAP
aps = evaluate_detections(all_boxes, all_gt_infos, classes,
use_gpu_nms = cfg.USE_GPU_NMS,
device_id = cfg.GPU_ID,
nms_threshold=cfg.RESULTS_NMS_THRESHOLD,
conf_threshold = cfg.RESULTS_NMS_CONF_THRESHOLD)
return aps
def train_faster_rcnn_alternating(base_model_file_name, debug_output=False):
'''
4-Step Alternating Training scheme from the Faster R-CNN paper:
# Create initial network, only rpn, without detection network
# --> train only the rpn (and conv3_1 and up for VGG16)
# buffer region proposals from rpn
# Create full network, initialize conv layers with imagenet, use buffered proposals
# --> train only detection network (and conv3_1 and up for VGG16)
# Keep conv weights from detection network and fix them
# --> train only rpn
# buffer region proposals from rpn
# Keep conv and rpn weights from step 3 and fix them
# --> train only detection network
'''
# Learning parameters
rpn_lr_factor = globalvars['rpn_lr_factor']
rpn_lr_per_sample_scaled = [x * rpn_lr_factor for x in cfg["CNTK"].RPN_LR_PER_SAMPLE]
frcn_lr_factor = globalvars['frcn_lr_factor']
frcn_lr_per_sample_scaled = [x * frcn_lr_factor for x in cfg["CNTK"].FRCN_LR_PER_SAMPLE]
l2_reg_weight = cfg["CNTK"].L2_REG_WEIGHT
mm_schedule = momentum_schedule(globalvars['momentum_per_mb'])
rpn_epochs = globalvars['rpn_epochs']
frcn_epochs = globalvars['frcn_epochs']
print("Using base model: {}".format(cfg["CNTK"].BASE_MODEL))
print("rpn_lr_per_sample: {}".format(rpn_lr_per_sample_scaled))
print("frcn_lr_per_sample: {}".format(frcn_lr_per_sample_scaled))
if debug_output:
print("Storing graphs and models to %s." % globalvars['output_path'])
# Input variables denoting features, labeled ground truth rois (as 5-tuples per roi) and image dimensions
image_input = input_variable((num_channels, image_height, image_width), dynamic_axes=[Axis.default_batch_axis()],
name=feature_node_name)
feat_norm = image_input - normalization_const
roi_input = input_variable((cfg["CNTK"].INPUT_ROIS_PER_IMAGE, 5), dynamic_axes=[Axis.default_batch_axis()])
scaled_gt_boxes = alias(roi_input, name='roi_input')
dims_input = input_variable((6), dynamic_axes=[Axis.default_batch_axis()])
dims_node = alias(dims_input, name='dims_input')
rpn_rois_input = input_variable((cfg["TRAIN"].RPN_POST_NMS_TOP_N, 4), dynamic_axes=[Axis.default_batch_axis()])
rpn_rois_buf = alias(rpn_rois_input, name='rpn_rois')
# base image classification model (e.g. VGG16 or AlexNet)
base_model = load_model(base_model_file_name)
print("stage 1a - rpn")
if True:
# Create initial network, only rpn, without detection network
# initial weights train?
# conv: base_model only conv3_1 and up
# rpn: init new yes
# frcn: - -
# conv layers
conv_layers = clone_conv_layers(base_model)
conv_out = conv_layers(feat_norm)
# RPN and losses
rpn_rois, rpn_losses = create_rpn(conv_out, scaled_gt_boxes, dims_node, proposal_layer_param_string=cfg["CNTK"].PROPOSAL_LAYER_PARAMS)
stage1_rpn_network = combine([rpn_rois, rpn_losses])
# train
if debug_output: plot(stage1_rpn_network, os.path.join(globalvars['output_path'], "graph_frcn_train_stage1a_rpn." + cfg["CNTK"].GRAPH_TYPE))
train_model(image_input, roi_input, dims_input, rpn_losses, rpn_losses,
rpn_lr_per_sample_scaled, mm_schedule, l2_reg_weight, epochs_to_train=rpn_epochs)
print("stage 1a - buffering rpn proposals")
buffered_proposals_s1 = compute_rpn_proposals(stage1_rpn_network, image_input, roi_input, dims_input)
print("stage 1b - frcn")
if True:
# Create full network, initialize conv layers with imagenet, fix rpn weights
# initial weights train?
# conv: base_model only conv3_1 and up
# rpn: stage1a rpn model no --> use buffered proposals
# frcn: base_model + new yes
# conv_layers
conv_layers = clone_conv_layers(base_model)
conv_out = conv_layers(feat_norm)
# use buffered proposals in target layer
rois, label_targets, bbox_targets, bbox_inside_weights = \
create_proposal_target_layer(rpn_rois_buf, scaled_gt_boxes, num_classes=globalvars['num_classes'])
# Fast RCNN and losses
fc_layers = clone_model(base_model, [pool_node_name], [last_hidden_node_name], CloneMethod.clone)
cls_score, bbox_pred = create_fast_rcnn_predictor(conv_out, rois, fc_layers)
detection_losses = create_detection_losses(cls_score, label_targets, rois, bbox_pred, bbox_targets, bbox_inside_weights)
pred_error = classification_error(cls_score, label_targets, axis=1, name="pred_error")
stage1_frcn_network = combine([rois, cls_score, bbox_pred, detection_losses, pred_error])
# train
if debug_output: plot(stage1_frcn_network, os.path.join(globalvars['output_path'], "graph_frcn_train_stage1b_frcn." + cfg["CNTK"].GRAPH_TYPE))
train_model(image_input, roi_input, dims_input, detection_losses, pred_error,
frcn_lr_per_sample_scaled, mm_schedule, l2_reg_weight, epochs_to_train=frcn_epochs,
rpn_rois_input=rpn_rois_input, buffered_rpn_proposals=buffered_proposals_s1)
buffered_proposals_s1 = None
print("stage 2a - rpn")
if True:
# Keep conv weights from detection network and fix them
# initial weights train?
# conv: stage1b frcn model no
# rpn: stage1a rpn model yes
# frcn: - -
# conv_layers
conv_layers = clone_model(stage1_frcn_network, [feature_node_name], [last_conv_node_name], CloneMethod.freeze)
conv_out = conv_layers(image_input)
# RPN and losses
rpn = clone_model(stage1_rpn_network, [last_conv_node_name, "roi_input", "dims_input"], ["rpn_rois", "rpn_losses"], CloneMethod.clone)
rpn_net = rpn(conv_out, dims_node, scaled_gt_boxes)
rpn_rois = rpn_net.outputs[0]
rpn_losses = rpn_net.outputs[1]
stage2_rpn_network = combine([rpn_rois, rpn_losses])
# train
if debug_output: plot(stage2_rpn_network, os.path.join(globalvars['output_path'], "graph_frcn_train_stage2a_rpn." + cfg["CNTK"].GRAPH_TYPE))
train_model(image_input, roi_input, dims_input, rpn_losses, rpn_losses,
rpn_lr_per_sample_scaled, mm_schedule, l2_reg_weight, epochs_to_train=rpn_epochs)
print("stage 2a - buffering rpn proposals")
buffered_proposals_s2 = compute_rpn_proposals(stage2_rpn_network, image_input, roi_input, dims_input)
print("stage 2b - frcn")
if True:
# Keep conv and rpn weights from step 3 and fix them
# initial weights train?
# conv: stage2a rpn model no
# rpn: stage2a rpn model no --> use buffered proposals
# frcn: stage1b frcn model yes -
# conv_layers
conv_layers = clone_model(stage2_rpn_network, [feature_node_name], [last_conv_node_name], CloneMethod.freeze)
conv_out = conv_layers(image_input)
# Fast RCNN and losses
frcn = clone_model(stage1_frcn_network, [last_conv_node_name, "rpn_rois", "roi_input"],
["cls_score", "bbox_regr", "rpn_target_rois", "detection_losses", "pred_error"], CloneMethod.clone)
stage2_frcn_network = frcn(conv_out, rpn_rois_buf, scaled_gt_boxes)
detection_losses = stage2_frcn_network.outputs[3]
pred_error = stage2_frcn_network.outputs[4]
# train
if debug_output: plot(stage2_frcn_network, os.path.join(globalvars['output_path'], "graph_frcn_train_stage2b_frcn." + cfg["CNTK"].GRAPH_TYPE))
train_model(image_input, roi_input, dims_input, detection_losses, pred_error,
frcn_lr_per_sample_scaled, mm_schedule, l2_reg_weight, epochs_to_train=frcn_epochs,
rpn_rois_input=rpn_rois_input, buffered_rpn_proposals=buffered_proposals_s2)
buffered_proposals_s2 = None
return create_eval_model(stage2_frcn_network, image_input, dims_input, rpn_model=stage2_rpn_network)
def sequence_to_sequence_translator(debug_output=False):
input_vocab_dim = 69
label_vocab_dim = 69
hidden_dim = 512
num_layers = 2
# Source and target inputs to the model
batch_axis = Axis.default_batch_axis()
input_seq_axis = Axis("inputAxis")
label_seq_axis = Axis("labelAxis")
input_dynamic_axes = [batch_axis, input_seq_axis]
raw_input = input_variable(shape=(input_vocab_dim), dynamic_axes=input_dynamic_axes)
label_dynamic_axes = [batch_axis, label_seq_axis]
raw_labels = input_variable(shape=(label_vocab_dim), dynamic_axes=label_dynamic_axes)
# Instantiate the sequence to sequence translation model
input_sequence = raw_input
# Drop the sentence start token from the label, for decoder training
label_sequence = slice(raw_labels, label_seq_axis, 1, 0)
label_sentence_start = sequence.first(raw_labels)
is_first_label = sequence.is_first(label_sequence)
label_sentence_start_scattered = sequence.scatter(label_sentence_start, is_first_label)
# Encoder
encoder_outputH = stabilize(input_sequence)
for i in range(0, num_layers):
(encoder_outputH, encoder_outputC) = LSTMP_component_with_self_stabilization(
encoder_outputH.output(), hidden_dim, hidden_dim, future_value, future_value
)
thought_vectorH = sequence.first(encoder_outputH)
thought_vectorC = sequence.first(encoder_outputC)
thought_vector_broadcastH = sequence.broadcast_as(thought_vectorH, label_sequence)
thought_vector_broadcastC = sequence.broadcast_as(thought_vectorC, label_sequence)
# Decoder
decoder_history_from_ground_truth = label_sequence
decoder_input = element_select(
is_first_label, label_sentence_start_scattered, past_value(decoder_history_from_ground_truth)
)
decoder_outputH = stabilize(decoder_input)
for i in range(0, num_layers):
if i > 0:
recurrence_hookH = past_value
recurrence_hookC = past_value
else:
isFirst = sequence.is_first(label_sequence)
recurrence_hookH = lambda operand: element_select(isFirst, thought_vector_broadcastH, past_value(operand))
recurrence_hookC = lambda operand: element_select(isFirst, thought_vector_broadcastC, past_value(operand))
(decoder_outputH, encoder_outputC) = LSTMP_component_with_self_stabilization(
decoder_outputH.output(), hidden_dim, hidden_dim, recurrence_hookH, recurrence_hookC
)
decoder_output = decoder_outputH
decoder_dim = hidden_dim
# Softmax output layer
z = linear_layer(stabilize(decoder_output), label_vocab_dim)
ce = cross_entropy_with_softmax(z, label_sequence)
errs = classification_error(z, label_sequence)
# Instantiate the trainer object to drive the model training
lr = 0.007
momentum_time_constant = 1100
momentum_per_sample = momentums_per_sample(math.exp(-1.0 / momentum_time_constant))
clipping_threshold_per_sample = 2.3
gradient_clipping_with_truncation = True
trainer = Trainer(
z,
ce,
errs,
[
momentum_sgd(
z.parameters(),
lr,
momentum_per_sample,
clipping_threshold_per_sample,
gradient_clipping_with_truncation,
)
],
)
rel_path = r"../../../../Examples/SequenceToSequence/CMUDict/Data/cmudict-0.7b.train-dev-20-21.ctf"
path = os.path.join(os.path.dirname(os.path.abspath(__file__)), rel_path)
feature_stream_name = "features"
labels_stream_name = "labels"
mb_source = text_format_minibatch_source(
path,
[
StreamConfiguration(feature_stream_name, input_vocab_dim, True, "S0"),
StreamConfiguration(labels_stream_name, label_vocab_dim, True, "S1"),
],
10000,
)
features_si = mb_source[feature_stream_name]
labels_si = mb_source[labels_stream_name]
# Get minibatches of sequences to train with and perform model training
minibatch_size = 72
training_progress_output_freq = 30
if debug_output:
training_progress_output_freq = training_progress_output_freq / 3
while True:
mb = mb_source.get_next_minibatch(minibatch_size)
if len(mb) == 0:
break
# Specify the mapping of input variables in the model to actual
# minibatch data to be trained with
arguments = {raw_input: mb[features_si], raw_labels: mb[labels_si]}
trainer.train_minibatch(arguments)
print_training_progress(trainer, i, training_progress_output_freq)
i += 1
rel_path = r"../../../../Examples/SequenceToSequence/CMUDict/Data/cmudict-0.7b.test.ctf"
path = os.path.join(os.path.dirname(os.path.abspath(__file__)), rel_path)
test_mb_source = text_format_minibatch_source(
path,
[
StreamConfiguration(feature_stream_name, input_vocab_dim, True, "S0"),
StreamConfiguration(labels_stream_name, label_vocab_dim, True, "S1"),
],
10000,
False,
)
features_si = test_mb_source[feature_stream_name]
labels_si = test_mb_source[labels_stream_name]
# choose this to be big enough for the longest sentence
train_minibatch_size = 1024
# Get minibatches of sequences to test and perform testing
i = 0
total_error = 0.0
while True:
mb = test_mb_source.get_next_minibatch(train_minibatch_size)
if len(mb) == 0:
break
# Specify the mapping of input variables in the model to actual
# minibatch data to be tested with
arguments = {raw_input: mb[features_si], raw_labels: mb[labels_si]}
mb_error = trainer.test_minibatch(arguments)
total_error += mb_error
if debug_output:
print("Minibatch {}, Error {} ".format(i, mb_error))
i += 1
# Average of evaluation errors of all test minibatches
return total_error / i
def eval_faster_rcnn_mAP(eval_model):
img_map_file = globalvars['test_map_file']
roi_map_file = globalvars['test_roi_file']
classes = globalvars['classes']
image_input = input_variable((num_channels, image_height, image_width), dynamic_axes=[Axis.default_batch_axis()], name=feature_node_name)
roi_input = input_variable((cfg["CNTK"].INPUT_ROIS_PER_IMAGE, 5), dynamic_axes=[Axis.default_batch_axis()])
dims_input = input_variable((6), dynamic_axes=[Axis.default_batch_axis()])
frcn_eval = eval_model(image_input, dims_input)
# Create the minibatch source
minibatch_source = ObjectDetectionMinibatchSource(
img_map_file, roi_map_file,
max_annotations_per_image=cfg["CNTK"].INPUT_ROIS_PER_IMAGE,
pad_width=image_width, pad_height=image_height, pad_value=img_pad_value,
randomize=False, use_flipping=False,
max_images=cfg["CNTK"].NUM_TEST_IMAGES)
# define mapping from reader streams to network inputs
input_map = {
minibatch_source.image_si: image_input,
minibatch_source.roi_si: roi_input,
minibatch_source.dims_si: dims_input
}
# all detections are collected into:
# all_boxes[cls][image] = N x 5 array of detections in
# (x1, y1, x2, y2, score)
all_boxes = [[[] for _ in range(num_test_images)] for _ in range(globalvars['num_classes'])]
# evaluate test images and write netwrok output to file
print("Evaluating Faster R-CNN model for %s images." % num_test_images)
all_gt_infos = {key: [] for key in classes}
for img_i in range(0, num_test_images):
mb_data = minibatch_source.next_minibatch(1, input_map=input_map)
gt_row = mb_data[roi_input].asarray()
gt_row = gt_row.reshape((cfg["CNTK"].INPUT_ROIS_PER_IMAGE, 5))
all_gt_boxes = gt_row[np.where(gt_row[:,-1] > 0)]
for cls_index, cls_name in enumerate(classes):
if cls_index == 0: continue
cls_gt_boxes = all_gt_boxes[np.where(all_gt_boxes[:,-1] == cls_index)]
all_gt_infos[cls_name].append({'bbox': np.array(cls_gt_boxes),
'difficult': [False] * len(cls_gt_boxes),
'det': [False] * len(cls_gt_boxes)})
output = frcn_eval.eval({image_input: mb_data[image_input], dims_input: mb_data[dims_input]})
out_dict = dict([(k.name, k) for k in output])
out_cls_pred = output[out_dict['cls_pred']][0]
out_rpn_rois = output[out_dict['rpn_rois']][0]
out_bbox_regr = output[out_dict['bbox_regr']][0]
labels = out_cls_pred.argmax(axis=1)
scores = out_cls_pred.max(axis=1)
regressed_rois = regress_rois(out_rpn_rois, out_bbox_regr, labels, mb_data[dims_input].asarray())
labels.shape = labels.shape + (1,)
scores.shape = scores.shape + (1,)
coords_score_label = np.hstack((regressed_rois, scores, labels))
# shape of all_boxes: e.g. 21 classes x 4952 images x 58 rois x 5 coords+score
for cls_j in range(1, globalvars['num_classes']):
coords_score_label_for_cls = coords_score_label[np.where(coords_score_label[:,-1] == cls_j)]
all_boxes[cls_j][img_i] = coords_score_label_for_cls[:,:-1].astype(np.float32, copy=False)
if (img_i+1) % 100 == 0:
print("Processed {} samples".format(img_i+1))
# calculate mAP
aps = evaluate_detections(all_boxes, all_gt_infos, classes,
nms_threshold=cfg["CNTK"].RESULTS_NMS_THRESHOLD,
conf_threshold = cfg["CNTK"].RESULTS_NMS_CONF_THRESHOLD)
ap_list = []
for class_name in aps:
ap_list += [aps[class_name]]
print('AP for {:>15} = {:.4f}'.format(class_name, aps[class_name]))
meanAP = np.nanmean(ap_list)
print('Mean AP = {:.4f}'.format(meanAP))
return meanAP
break
trainer.train_minibatch(data)
loss_numer += trainer.previous_minibatch_loss_average() * trainer.previous_minibatch_sample_count() # too much code for something this simple
loss_denom += trainer.previous_minibatch_sample_count()
metric_numer += trainer.previous_minibatch_evaluation_average() * trainer.previous_minibatch_sample_count()
metric_denom += trainer.previous_minibatch_sample_count()
print_training_progress(trainer, mbs if mbs > 10 else 0, num_mbs_to_show_result)
t += num_samples[slot_labels]
#print (num_samples[slot_labels], t)
mbs += 1
print("--- EPOCH {} DONE: loss = {:0.6f} * {}, metric = {:0.1f}% * {} ---".format(epoch+1, loss_numer/loss_denom, loss_denom, metric_numer/metric_denom*100.0, metric_denom))
return loss_numer/loss_denom, metric_numer/metric_denom
#############################
# main function boilerplate #
#############################
if __name__=='__main__':
# TODO: get closure on Amit's feedback "Not the right pattern as we discussed over email. Please change to set_default_device(gpu(0))"
#set_gpu(0)
#set_computation_network_trace_level(1) # TODO: remove debugging facilities once this all works
reader = create_reader(data_dir + "/atis.train.ctf")
model = create_model(_inf=_Infer(shape=input_dim, axis=[Axis.default_batch_axis(), Axis.default_dynamic_axis()]))
# TODO: Currently this fails with a mismatch error if axes ^^ are given in opposite order. I think it shouldn't.
# train
train(reader, model, max_epochs=8)
# test (TODO)
reader = create_reader(data_dir + "/atis.test.ctf")
#test(reader, model_dir + "/slu.cmf") # TODO: what is the correct pattern here?
def compute_test_set_aps(eval_model, cfg):
num_test_images = 10 #cfg["DATA"].NUM_TEST_IMAGES
classes = cfg["DATA"].CLASSES
image_input = input_variable(shape=(cfg.NUM_CHANNELS, cfg.IMAGE_HEIGHT,
cfg.IMAGE_WIDTH),
dynamic_axes=[Axis.default_batch_axis()],
name=cfg["MODEL"].FEATURE_NODE_NAME)
roi_input = input_variable((cfg.INPUT_ROIS_PER_IMAGE, 5),
dynamic_axes=[Axis.default_batch_axis()])
dims_input = input_variable((6), dynamic_axes=[Axis.default_batch_axis()])
frcn_eval = eval_model(image_input, dims_input)
# Create the minibatch source
minibatch_source = ObjectDetectionMinibatchSource(
cfg["DATA"].TEST_MAP_FILE,
cfg["DATA"].TEST_ROI_FILE,
max_annotations_per_image=cfg.INPUT_ROIS_PER_IMAGE,
pad_width=cfg.IMAGE_WIDTH,
pad_height=cfg.IMAGE_HEIGHT,
pad_value=cfg["MODEL"].IMG_PAD_COLOR,
randomize=False,
use_flipping=False,
max_images=cfg["DATA"].NUM_TEST_IMAGES,
num_classes=cfg["DATA"].NUM_CLASSES,
proposal_provider=None)
# define mapping from reader streams to network inputs
input_map = {
minibatch_source.image_si: image_input,
minibatch_source.roi_si: roi_input,
minibatch_source.dims_si: dims_input
}
# all detections are collected into:
# all_boxes[cls][image] = N x 5 array of detections in (x1, y1, x2, y2, score)
all_boxes = [[[] for _ in range(num_test_images)]
for _ in range(cfg["DATA"].NUM_CLASSES)]
# evaluate test images and write netwrok output to file
print("Evaluating Faster R-CNN model for %s images." % num_test_images)
all_gt_infos = {key: [] for key in classes}
for img_i in range(0, num_test_images):
mb_data = minibatch_source.next_minibatch(1, input_map=input_map)
gt_row = mb_data[roi_input].asarray()
gt_row = gt_row.reshape((cfg.INPUT_ROIS_PER_IMAGE, 5))
all_gt_boxes = gt_row[np.where(gt_row[:, -1] > 0)]
for cls_index, cls_name in enumerate(classes):
if cls_index == 0: continue
cls_gt_boxes = all_gt_boxes[np.where(
all_gt_boxes[:, -1] == cls_index)]
all_gt_infos[cls_name].append({
'bbox':
np.array(cls_gt_boxes),
'difficult': [False] * len(cls_gt_boxes),
'det': [False] * len(cls_gt_boxes)
})
output = frcn_eval.eval({
image_input: mb_data[image_input],
dims_input: mb_data[dims_input]
})
out_dict = dict([(k.name, k) for k in output])
out_cls_pred = output[out_dict['cls_pred']][0]
out_rpn_rois = output[out_dict['rpn_rois']][0]
out_bbox_regr = output[out_dict['bbox_regr']][0]
labels = out_cls_pred.argmax(axis=1)
scores = out_cls_pred.max(axis=1)
regressed_rois = regress_rois(out_rpn_rois, out_bbox_regr, labels,
mb_data[dims_input].asarray())
labels.shape = labels.shape + (1, )
scores.shape = scores.shape + (1, )
coords_score_label = np.hstack((regressed_rois, scores, labels))
# shape of all_boxes: e.g. 21 classes x 4952 images x 58 rois x 5 coords+score
for cls_j in range(1, cfg["DATA"].NUM_CLASSES):
coords_score_label_for_cls = coords_score_label[np.where(
coords_score_label[:, -1] == cls_j)]
all_boxes[cls_j][
img_i] = coords_score_label_for_cls[:, :-1].astype(np.float32,
copy=False)
if (img_i + 1) % 100 == 0:
print("Processed {} samples".format(img_i + 1))
# calculate mAP
aps = evaluate_detections(all_boxes,
all_gt_infos,
classes,
use_gpu_nms=cfg.USE_GPU_NMS,
device_id=cfg.GPU_ID,
nms_threshold=cfg.RESULTS_NMS_THRESHOLD,
conf_threshold=cfg.RESULTS_NMS_CONF_THRESHOLD)
return aps
def train_fast_rcnn(cfg):
# Train only if no model exists yet
model_path = cfg['MODEL_PATH']
if os.path.exists(model_path) and cfg["CNTK"].MAKE_MODE:
print("Loading existing model from %s" % model_path)
return load_model(model_path)
else:
# Input variables denoting features and labeled ground truth rois (as 5-tuples per roi)
image_input = input_variable(shape=(cfg.NUM_CHANNELS, cfg.IMAGE_HEIGHT, cfg.IMAGE_WIDTH),
dynamic_axes=[Axis.default_batch_axis()],
name=cfg["MODEL"].FEATURE_NODE_NAME)
roi_proposals = input_variable((cfg.NUM_ROI_PROPOSALS, 4), dynamic_axes=[Axis.default_batch_axis()], name = "roi_proposals")
label_targets = input_variable((cfg.NUM_ROI_PROPOSALS, cfg["DATA"].NUM_CLASSES), dynamic_axes=[Axis.default_batch_axis()])
bbox_targets = input_variable((cfg.NUM_ROI_PROPOSALS, 4*cfg["DATA"].NUM_CLASSES), dynamic_axes=[Axis.default_batch_axis()])
bbox_inside_weights = input_variable((cfg.NUM_ROI_PROPOSALS, 4*cfg["DATA"].NUM_CLASSES), dynamic_axes=[Axis.default_batch_axis()])
# Instantiate the Fast R-CNN prediction model and loss function
loss, pred_error = create_fast_rcnn_model(image_input, roi_proposals, label_targets, bbox_targets, bbox_inside_weights, cfg)
if isinstance(loss, cntk.Variable):
loss = combine([loss])
if cfg["CNTK"].DEBUG_OUTPUT:
print("Storing graphs and models to %s." % cfg.OUTPUT_PATH)
plot(loss, os.path.join(cfg.OUTPUT_PATH, "graph_frcn_train." + cfg["CNTK"].GRAPH_TYPE))
# Set learning parameters
lr_factor = cfg["CNTK"].LR_FACTOR
lr_per_sample_scaled = [x * lr_factor for x in cfg["CNTK"].LR_PER_SAMPLE]
mm_schedule = momentum_schedule(cfg["CNTK"].MOMENTUM_PER_MB)
l2_reg_weight = cfg["CNTK"].L2_REG_WEIGHT
epochs_to_train = cfg["CNTK"].MAX_EPOCHS
print("Using base model: {}".format(cfg["MODEL"].BASE_MODEL))
print("lr_per_sample: {}".format(lr_per_sample_scaled))
# --- train ---
# Instantiate the learners and the trainer object
params = loss.parameters
biases = [p for p in params if '.b' in p.name or 'b' == p.name]
others = [p for p in params if not p in biases]
bias_lr_mult = cfg["CNTK"].BIAS_LR_MULT
lr_schedule = learning_rate_schedule(lr_per_sample_scaled, unit=UnitType.sample)
learner = momentum_sgd(others, lr_schedule, mm_schedule, l2_regularization_weight=l2_reg_weight, unit_gain=False, use_mean_gradient=True)
bias_lr_per_sample = [v * bias_lr_mult for v in cfg["CNTK"].LR_PER_SAMPLE]
bias_lr_schedule = learning_rate_schedule(bias_lr_per_sample, unit=UnitType.sample)
bias_learner = momentum_sgd(biases, bias_lr_schedule, mm_schedule, l2_regularization_weight=l2_reg_weight, unit_gain=False, use_mean_gradient=True)
trainer = Trainer(None, (loss, pred_error), [learner, bias_learner])
# Get minibatches of images and perform model training
print("Training model for %s epochs." % epochs_to_train)
log_number_of_parameters(loss)
# Create the minibatch source
if cfg.USE_PRECOMPUTED_PROPOSALS:
proposal_provider = ProposalProvider.fromfile(cfg["DATA"].TRAIN_PRECOMPUTED_PROPOSALS_FILE, cfg.NUM_ROI_PROPOSALS)
else:
proposal_provider = ProposalProvider.fromconfig(cfg)
od_minibatch_source = ObjectDetectionMinibatchSource(
cfg["DATA"].TRAIN_MAP_FILE, cfg["DATA"].TRAIN_ROI_FILE,
max_annotations_per_image=cfg.INPUT_ROIS_PER_IMAGE,
pad_width=cfg.IMAGE_WIDTH,
pad_height=cfg.IMAGE_HEIGHT,
pad_value=cfg["MODEL"].IMG_PAD_COLOR,
randomize=True,
use_flipping=cfg["TRAIN"].USE_FLIPPED,
max_images=cfg["DATA"].NUM_TRAIN_IMAGES,
num_classes=cfg["DATA"].NUM_CLASSES,
proposal_provider=proposal_provider,
provide_targets=True,
proposal_iou_threshold = cfg.BBOX_THRESH,
normalize_means = None if not cfg.BBOX_NORMALIZE_TARGETS else cfg.BBOX_NORMALIZE_MEANS,
normalize_stds = None if not cfg.BBOX_NORMALIZE_TARGETS else cfg.BBOX_NORMALIZE_STDS)
# define mapping from reader streams to network inputs
input_map = {
od_minibatch_source.image_si: image_input,
od_minibatch_source.proposals_si: roi_proposals,
od_minibatch_source.label_targets_si: label_targets,
od_minibatch_source.bbox_targets_si: bbox_targets,
od_minibatch_source.bbiw_si: bbox_inside_weights
}
progress_printer = ProgressPrinter(tag='Training', num_epochs=epochs_to_train, gen_heartbeat=True)
for epoch in range(epochs_to_train): # loop over epochs
sample_count = 0
while sample_count < cfg["DATA"].NUM_TRAIN_IMAGES: # loop over minibatches in the epoch
data = od_minibatch_source.next_minibatch(min(cfg.MB_SIZE, cfg["DATA"].NUM_TRAIN_IMAGES - sample_count), input_map=input_map)
trainer.train_minibatch(data) # update model with it
sample_count += trainer.previous_minibatch_sample_count # count samples processed so far
progress_printer.update_with_trainer(trainer, with_metric=True) # log progress
if sample_count % 100 == 0:
print("Processed {} samples".format(sample_count))
progress_printer.epoch_summary(with_metric=True)
eval_model = create_fast_rcnn_eval_model(loss, image_input, roi_proposals, cfg)
eval_model.save(cfg['MODEL_PATH'])
return eval_model
def eval_faster_rcnn(eval_model, imgPath, img_shape,
results_base_path, feature_node_name, classes, mode,
drawUnregressedRois=False, drawNegativeRois=False,
nmsThreshold=0.5, nmsConfThreshold=0.0, bgrPlotThreshold = 0.8):
# prepare model
image_input = input_variable(img_shape, dynamic_axes=[Axis.default_batch_axis()], name=feature_node_name)
dims_input = input_variable((1,6), dynamic_axes=[Axis.default_batch_axis()], name='dims_input')
frcn_eval = eval_model(image_input, dims_input)
#dims_input_const = cntk.constant([image_width, image_height, image_width, image_height, image_width, image_height], (1, 6))
print("Plotting results from Faster R-CNN model for image.")
# evaluate single image
_, cntk_img_input, dims = load_resize_and_pad(imgPath, img_shape[2], img_shape[1])
dims_input = np.array(dims, dtype=np.float32)
dims_input.shape = (1,) + dims_input.shape
output = frcn_eval.eval({frcn_eval.arguments[0]: [cntk_img_input], frcn_eval.arguments[1]: dims_input})
out_dict = dict([(k.name, k) for k in output])
out_cls_pred = output[out_dict['cls_pred']][0]
out_rpn_rois = output[out_dict['rpn_rois']][0]
out_bbox_regr = output[out_dict['bbox_regr']][0]
labels = out_cls_pred.argmax(axis=1)
scores = out_cls_pred.max(axis=1).tolist()
if mode=="returntags":
class Tag(object):
def __init__(self, label, score, bbox):
self.label = label
self.score = score
self.bbox = bbox
def serialize(self):
return {
'label': self.label,
'score': self.score,
'bbox': self.bbox,
}
results = []
regressed_rois = regress_rois(out_rpn_rois, out_bbox_regr, labels, dims)
nmsKeepIndices = apply_nms_to_single_image_results(regressed_rois, labels, scores,
nms_threshold=nmsThreshold,
conf_threshold=nmsConfThreshold)
print(len(out_rpn_rois))
imsave('./Temp/resized.jpg',imgDebug)
for i in range(len(out_rpn_rois)):
if labels[i] != 0:
x = Tag(str(classes[labels[i]]), str(scores[i]), str(out_rpn_rois[i]))
results.append(x)
# return {}
return results
elif mode=="returnimage":
evaluated_image_path = "{}/{}".format(results_base_path, 'evaluated_' + os.path.basename(imgPath))
if drawUnregressedRois:
# plot results without final regression
imgDebug = visualizeResultsFaster(imgPath, labels, scores, out_rpn_rois, img_shape[2], img_shape[1],
classes, nmsKeepIndices=None, boDrawNegativeRois=drawNegativeRois,
decisionThreshold=bgrPlotThreshold)
imsave(evaluated_image_path, imgDebug)
else:
# apply regression and nms to bbox coordinates
regressed_rois = regress_rois(out_rpn_rois, out_bbox_regr, labels, dims)
nmsKeepIndices = apply_nms_to_single_image_results(regressed_rois, labels, scores,
nms_threshold=nmsThreshold,
conf_threshold=nmsConfThreshold)
img,allboxes = visualizeResultsFaster(imgPath, labels, scores, regressed_rois, img_shape[2], img_shape[1],
classes, nmsKeepIndices=nmsKeepIndices,
boDrawNegativeRois=drawNegativeRois,
decisionThreshold=bgrPlotThreshold)
# imsave(evaluated_image_path, img)
allboxes=np.array(allboxes)
# perform non-maximum suppression on the bounding boxes
pick = non_max_suppression_fast(allboxes, 0.6)
# print("[x] after applying non-maximum, %d bounding boxes" % (len(pick)))
black_bg = 0*np.ones_like(img)
# loop over the picked bounding boxes and extract each of the box
for (startX, startY, endX, endY) in pick:
roi=img[startY:endY,startX:endX]
black_bg[startY:endY,startX:endX]=roi
result = black_bg.copy()
print(black_bg.shape)
image = cv2.cvtColor(black_bg, cv2.COLOR_RGB2HSV)
lower = np.array([18, 0, 0])
upper = np.array([179, 255, 255])
mask = cv2.inRange(image, lower, upper)
result = cv2.bitwise_and(result,result, mask=mask)
lengthThroughRotatedRectangle=[]
lengthThroughManualCalculation=[]
# length Calculation through Rotated Rectangle
image=cv2.cvtColor(result,cv2.COLOR_BGR2GRAY)
ret,thresh = cv2.threshold(image,127,255,0)
working_image=thresh.copy()
result_img=thresh.copy()
working_image[:,:]=0
result_img[:,:]=0
kernel = np.ones((7,7), np.uint8)
for (startX, startY, endX, endY) in pick:
cord=(int(startX),int(startY),int(endX),int(endY))
working_image[:,:]=0
working_image[cord[1]:cord[3],cord[0]:cord[2]]=thresh[cord[1]:cord[3],cord[0]:cord[2]]
result_img[cord[1]:cord[3],cord[0]:cord[2]]=thresh[cord[1]:cord[3],cord[0]:cord[2]]
working_image=cv2.morphologyEx(working_image, cv2.MORPH_OPEN, kernel)
contours, hierarchy = cv2.findContours(working_image,cv2.RETR_TREE,cv2.CHAIN_APPROX_SIMPLE)
if(len(contours)>0):
c = max(contours, key = cv2.contourArea)
rect = cv2.minAreaRect(c)
(x, y), (width, height), angle=rect
height=int(height)
width=int(width)
if width >height:
height=width
lengthThroughRotatedRectangle.append(height);
# length Calculation through Manual process
for (startX, startY, endX, endY) in pick:
cord=(int(startX),int(startY),int(endX),int(endY))
widthofRectangle=cord[2]-cord[0]
NonZeroPixels=[]
threshold=0.20;
height=0
width=0
for i in range(startY,endY):
row=thresh[i,startX:endX]
NonZeroPixelsInRow=np.count_nonzero(row)
WidthRatioInRow=NonZeroPixelsInRow/widthofRectangle
if(WidthRatioInRow>threshold):
height=height+1
NonZeroPixels.append(NonZeroPixelsInRow)
width=round(sum(NonZeroPixels)/len(NonZeroPixels))
if(width > height):
height=width
lengthThroughManualCalculation.append(height)
# print("length through rotatedRectangle\n",lengthThroughRotatedRectangle)
# print("length through ManualCalculation\n",lengthThroughManualCalculation)
SpikesLength=[int((a+b)/2) for a,b in zip(lengthThroughRotatedRectangle,lengthThroughManualCalculation)]
# print("spike length\n",SpikesLength)
SpikesLength = [i * 0.1 for i in SpikesLength]
print("Spike Lenght in cm",SpikesLength)
# imsave(evaluated_image_path, thresh)
return SpikesLength
else:
raise ValueError("Unsupported value found in 'mode' parameter")
def eval_faster_rcnn(eval_model, imgPath, img_shape,
results_base_path, feature_node_name, classes, mode,
drawUnregressedRois=False, drawNegativeRois=False,
nmsThreshold=0.5, nmsConfThreshold=0.0, bgrPlotThreshold = 0.8):
# prepare model
image_input = input_variable(img_shape, dynamic_axes=[Axis.default_batch_axis()], name=feature_node_name)
dims_input = input_variable((1,6), dynamic_axes=[Axis.default_batch_axis()], name='dims_input')
frcn_eval = eval_model(image_input, dims_input)
#dims_input_const = cntk.constant([image_width, image_height, image_width, image_height, image_width, image_height], (1, 6))
print("Plotting results from Faster R-CNN model for image.")
# evaluate single image
_, cntk_img_input, dims = load_resize_and_pad(imgPath, img_shape[2], img_shape[1])
dims_input = np.array(dims, dtype=np.float32)
dims_input.shape = (1,) + dims_input.shape
output = frcn_eval.eval({frcn_eval.arguments[0]: [cntk_img_input], frcn_eval.arguments[1]: dims_input})
out_dict = dict([(k.name, k) for k in output])
out_cls_pred = output[out_dict['cls_pred']][0]
out_rpn_rois = output[out_dict['rpn_rois']][0]
out_bbox_regr = output[out_dict['bbox_regr']][0]
labels = out_cls_pred.argmax(axis=1)
scores = out_cls_pred.max(axis=1).tolist()
if mode=="returntags":
class Tag(object):
def __init__(self, label, score, bbox):
self.label = label
self.score = score
self.bbox = bbox
def serialize(self):
return {
'label': self.label,
'score': self.score,
'bbox': self.bbox,
}
results = []
for i in range(len(out_rpn_rois)):
if labels[i] != 0:
x = Tag(str(classes[labels[i]]), str(scores[i]), str(out_rpn_rois[i]))
results.append(x)
return results
elif mode=="returnimage":
evaluated_image_path = "{}/{}".format(results_base_path, 'evaluated_' + os.path.basename(imgPath))
if drawUnregressedRois:
# plot results without final regression
imgDebug = visualizeResultsFaster(imgPath, labels, scores, out_rpn_rois, img_shape[2], img_shape[1],
classes, nmsKeepIndices=None, boDrawNegativeRois=drawNegativeRois,
decisionThreshold=bgrPlotThreshold)
imsave(evaluated_image_path, imgDebug)
else:
# apply regression and nms to bbox coordinates
regressed_rois = regress_rois(out_rpn_rois, out_bbox_regr, labels, dims)
nmsKeepIndices = apply_nms_to_single_image_results(regressed_rois, labels, scores,
nms_threshold=nmsThreshold,
conf_threshold=nmsConfThreshold)
img = visualizeResultsFaster(imgPath, labels, scores, regressed_rois, img_shape[2], img_shape[1],
classes, nmsKeepIndices=nmsKeepIndices,
boDrawNegativeRois=drawNegativeRois,
decisionThreshold=bgrPlotThreshold)
imsave(evaluated_image_path, img)
return evaluated_image_path
else:
raise ValueError("Unsupported value found in 'mode' parameter")
# Train data reader
train_reader = create_reader(train_file, True)
# Validation/Test data reader
valid_reader = create_reader(valid_file, False)
model_dir = "." # we downloaded our data to the local directory above # TODO check me
# model dimensions
input_vocab_dim = input_vocab_size
label_vocab_dim = label_vocab_size
hidden_dim = 128
num_layers = 1
# Source and target inputs to the model
batch_axis = Axis.default_batch_axis()
input_seq_axis = Axis('inputAxis')
label_seq_axis = Axis('labelAxis')
input_dynamic_axes = [batch_axis, input_seq_axis]
raw_input = input_variable(shape=(input_vocab_dim),
dynamic_axes=input_dynamic_axes,
name='raw_input')
label_dynamic_axes = [batch_axis, label_seq_axis]
raw_labels = input_variable(shape=(label_vocab_dim),
dynamic_axes=label_dynamic_axes,
name='raw_labels')
# Instantiate the sequence to sequence translation model
input_sequence = raw_input
def sequence_to_sequence_translator(debug_output=False, run_test=False):
input_vocab_dim = 69
label_vocab_dim = 69
# network complexity; initially low for faster testing
hidden_dim = 256
num_layers = 1
# Source and target inputs to the model
batch_axis = Axis.default_batch_axis()
input_seq_axis = Axis('inputAxis')
label_seq_axis = Axis('labelAxis')
input_dynamic_axes = [batch_axis, input_seq_axis]
raw_input = input_variable(
shape=(input_vocab_dim), dynamic_axes=input_dynamic_axes, name='raw_input')
label_dynamic_axes = [batch_axis, label_seq_axis]
raw_labels = input_variable(
shape=(label_vocab_dim), dynamic_axes=label_dynamic_axes, name='raw_labels')
# Instantiate the sequence to sequence translation model
input_sequence = raw_input
# Drop the sentence start token from the label, for decoder training
label_sequence = sequence.slice(raw_labels, 1, 0) # <s> A B C </s> --> A B C </s>
label_sentence_start = sequence.first(raw_labels) # <s>
is_first_label = sequence.is_first(label_sequence) # <s> 0 0 0 ...
label_sentence_start_scattered = sequence.scatter(
label_sentence_start, is_first_label)
# Encoder
encoder_outputH = stabilize(input_sequence)
for i in range(0, num_layers):
(encoder_outputH, encoder_outputC) = LSTMP_component_with_self_stabilization(
encoder_outputH.output, hidden_dim, hidden_dim, future_value, future_value)
thought_vectorH = sequence.first(encoder_outputH)
thought_vectorC = sequence.first(encoder_outputC)
thought_vector_broadcastH = sequence.broadcast_as(
thought_vectorH, label_sequence)
thought_vector_broadcastC = sequence.broadcast_as(
thought_vectorC, label_sequence)
# Decoder
decoder_history_hook = alias(label_sequence, name='decoder_history_hook') # copy label_sequence
decoder_input = element_select(is_first_label, label_sentence_start_scattered, past_value(
decoder_history_hook))
decoder_outputH = stabilize(decoder_input)
for i in range(0, num_layers):
if (i > 0):
recurrence_hookH = past_value
recurrence_hookC = past_value
else:
isFirst = sequence.is_first(label_sequence)
recurrence_hookH = lambda operand: element_select(
isFirst, thought_vector_broadcastH, past_value(operand))
recurrence_hookC = lambda operand: element_select(
isFirst, thought_vector_broadcastC, past_value(operand))
(decoder_outputH, encoder_outputC) = LSTMP_component_with_self_stabilization(
decoder_outputH.output, hidden_dim, hidden_dim, recurrence_hookH, recurrence_hookC)
decoder_output = decoder_outputH
# Softmax output layer
z = linear_layer(stabilize(decoder_output), label_vocab_dim)
# Criterion nodes
ce = cross_entropy_with_softmax(z, label_sequence)
errs = classification_error(z, label_sequence)
# network output for decoder history
net_output = hardmax(z)
# make a clone of the graph where the ground truth is replaced by the network output
ng = z.clone(CloneMethod.share, {decoder_history_hook.output : net_output.output})
# Instantiate the trainer object to drive the model training
lr_per_minibatch = learning_rate_schedule(0.5, UnitType.minibatch)
momentum_time_constant = momentum_as_time_constant_schedule(1100)
clipping_threshold_per_sample = 2.3
gradient_clipping_with_truncation = True
learner = momentum_sgd(z.parameters,
lr_per_minibatch, momentum_time_constant,
gradient_clipping_threshold_per_sample=clipping_threshold_per_sample,
gradient_clipping_with_truncation=gradient_clipping_with_truncation)
trainer = Trainer(z, ce, errs, learner)
# setup data
train_path = os.path.join(os.path.dirname(os.path.abspath(__file__)), "..", "Data", "cmudict-0.7b.train-dev-20-21.ctf")
valid_path = os.path.join(os.path.dirname(os.path.abspath(__file__)), "..", "Data", "tiny.ctf")
# readers
randomize_data = True
if run_test:
randomize_data = False # because we want to get an exact error
train_reader = create_reader(train_path, randomize_data, input_vocab_dim, label_vocab_dim)
train_bind = {
raw_input : train_reader.streams.features,
raw_labels : train_reader.streams.labels
}
# get the vocab for printing output sequences in plaintext
vocab_path = os.path.join(os.path.dirname(os.path.abspath(__file__)), "..", "Data", "cmudict-0.7b.mapping")
vocab = [w.strip() for w in open(vocab_path).readlines()]
i2w = { i:ch for i,ch in enumerate(vocab) }
# Get minibatches of sequences to train with and perform model training
i = 0
mbs = 0
minibatch_size = 72
epoch_size = 908241
max_epochs = 10
training_progress_output_freq = 500
# make things more basic for running a quicker test
if run_test:
epoch_size = 5000
max_epochs = 1
training_progress_output_freq = 30
valid_reader = create_reader(valid_path, False, input_vocab_dim, label_vocab_dim)
valid_bind = {
find_arg_by_name('raw_input',ng) : valid_reader.streams.features,
find_arg_by_name('raw_labels',ng) : valid_reader.streams.labels
}
for epoch in range(max_epochs):
loss_numer = 0
metric_numer = 0
denom = 0
while i < (epoch+1) * epoch_size:
# get next minibatch of training data
mb_train = train_reader.next_minibatch(minibatch_size, input_map=train_bind)
trainer.train_minibatch(mb_train)
# collect epoch-wide stats
samples = trainer.previous_minibatch_sample_count
loss_numer += trainer.previous_minibatch_loss_average * samples
metric_numer += trainer.previous_minibatch_evaluation_average * samples
denom += samples
# every N MBs evaluate on a test sequence to visually show how we're doing
if mbs % training_progress_output_freq == 0:
mb_valid = valid_reader.next_minibatch(minibatch_size, input_map=valid_bind)
e = ng.eval(mb_valid)
print_sequences(e, i2w)
print_training_progress(trainer, mbs, training_progress_output_freq)
i += mb_train[raw_labels].num_samples
mbs += 1
print("--- EPOCH %d DONE: loss = %f, errs = %f ---" % (epoch, loss_numer/denom, 100.0*(metric_numer/denom)))
error1 = translator_test_error(z, trainer, input_vocab_dim, label_vocab_dim)
z.save_model("seq2seq.dnn")
z.restore_model("seq2seq.dnn")
label_seq_axis = Axis('labelAxis')
label_sequence = sequence.slice(find_arg_by_name('raw_labels',z), 1, 0)
ce = cross_entropy_with_softmax(z, label_sequence)
errs = classification_error(z, label_sequence)
trainer = Trainer(z, ce, errs, [momentum_sgd(
z.parameters, lr_per_minibatch, momentum_time_constant, clipping_threshold_per_sample, gradient_clipping_with_truncation)])
error2 = translator_test_error(z, trainer, input_vocab_dim, label_vocab_dim)
assert error1 == error2
return error1
def create_model():
# Source and target inputs to the model
batch_axis = Axis.default_batch_axis()
input_seq_axis = Axis('inputAxis')
label_seq_axis = Axis('labelAxis')
input_dynamic_axes = [batch_axis, input_seq_axis]
raw_input = input_variable(shape=(input_vocab_dim),
dynamic_axes=input_dynamic_axes,
name='raw_input')
label_dynamic_axes = [batch_axis, label_seq_axis]
raw_labels = input_variable(shape=(label_vocab_dim),
dynamic_axes=label_dynamic_axes,
name='raw_labels')
# Instantiate the sequence to sequence translation model
input_sequence = raw_input
# Drop the sentence start token from the label, for decoder training
label_sequence = sequence.slice(
raw_labels, 1, 0,
name='label_sequence') # <s> A B C </s> --> A B C </s>
label_sentence_start = sequence.first(raw_labels) # <s>
# Setup primer for decoder
is_first_label = sequence.is_first(label_sequence) # 1 0 0 0 ...
label_sentence_start_scattered = sequence.scatter(label_sentence_start,
is_first_label)
# Encoder
stabilize = Stabilizer()
encoder_output_h = stabilize(input_sequence)
for i in range(0, num_layers):
(encoder_output_h,
encoder_output_c) = LSTM_layer(encoder_output_h.output, hidden_dim,
future_value, future_value)
# Prepare encoder output to be used in decoder
thought_vector_h = sequence.first(encoder_output_h)
thought_vector_c = sequence.first(encoder_output_c)
thought_vector_broadcast_h = sequence.broadcast_as(thought_vector_h,
label_sequence)
thought_vector_broadcast_c = sequence.broadcast_as(thought_vector_c,
label_sequence)
# Decoder
decoder_history_hook = alias(
label_sequence, name='decoder_history_hook') # copy label_sequence
decoder_input = element_select(is_first_label,
label_sentence_start_scattered,
past_value(decoder_history_hook))
decoder_output_h = stabilize(decoder_input)
for i in range(0, num_layers):
if (i > 0):
recurrence_hook_h = past_value
recurrence_hook_c = past_value
else:
recurrence_hook_h = lambda operand: element_select(
is_first_label, thought_vector_broadcast_h, past_value(operand)
)
recurrence_hook_c = lambda operand: element_select(
is_first_label, thought_vector_broadcast_c, past_value(operand)
)
(decoder_output_h,
decoder_output_c) = LSTM_layer(decoder_output_h.output, hidden_dim,
recurrence_hook_h, recurrence_hook_c)
# Linear output layer
W = parameter(shape=(decoder_output_h.shape[0], label_vocab_dim),
init=glorot_uniform())
B = parameter(shape=(label_vocab_dim), init=0)
z = plus(B, times(stabilize(decoder_output_h), W))
return z
features=StreamDef(field="S0", shape=input_vocab_dim, is_sparse=True),
labels=StreamDef(field="S1", shape=label_vocab_dim, is_sparse=True),
),
),
randomize=is_training,
max_sweeps=INFINITELY_REPEAT if is_training else 1,
)
########################
# define the model #
########################
# type annotations for the two sequence types; later use InputSequence[Tensor[input_vocab_dim]]
# CNTK considers these two different types since they run over different sequence indices.
inputAxis = Axis("inputAxis")
labelAxis = Axis("labelAxis")
InputSequence = SequenceOver[inputAxis]
LabelSequence = SequenceOver[labelAxis]
# create the s2s model
def create_model(): # :: (history*, input*) -> logP(w)*
# Embedding: (input*) --> embedded_input*
# Right now assumes shared embedding and shared vocab size.
embed = Embedding(embedding_dim, name="embed") if use_embedding else identity
# Encoder: (input*) --> (h0, c0)
# Create multiple layers of LSTMs by passing the output of the i-th layer
# to the (i+1)th layer as its input
# This is the plain s2s encoder. The attention encoder will keep the entire sequence instead.
# Note: We go_backwards for the plain model, but forward for the attention model.
def train_fast_rcnn(cfg):
# Train only if no model exists yet
model_path = cfg['MODEL_PATH']
if os.path.exists(model_path) and cfg["CNTK"].MAKE_MODE:
print("Loading existing model from %s" % model_path)
return load_model(model_path)
else:
# Input variables denoting features and labeled ground truth rois (as 5-tuples per roi)
image_input = input_variable(shape=(cfg.NUM_CHANNELS, cfg.IMAGE_HEIGHT,
cfg.IMAGE_WIDTH),
dynamic_axes=[Axis.default_batch_axis()],
name=cfg["MODEL"].FEATURE_NODE_NAME)
roi_proposals = input_variable(
(cfg.NUM_ROI_PROPOSALS, 4),
dynamic_axes=[Axis.default_batch_axis()],
name="roi_proposals")
label_targets = input_variable(
(cfg.NUM_ROI_PROPOSALS, cfg["DATA"].NUM_CLASSES),
dynamic_axes=[Axis.default_batch_axis()])
bbox_targets = input_variable(
(cfg.NUM_ROI_PROPOSALS, 4 * cfg["DATA"].NUM_CLASSES),
dynamic_axes=[Axis.default_batch_axis()])
bbox_inside_weights = input_variable(
(cfg.NUM_ROI_PROPOSALS, 4 * cfg["DATA"].NUM_CLASSES),
dynamic_axes=[Axis.default_batch_axis()])
# Instantiate the Fast R-CNN prediction model and loss function
loss, pred_error = create_fast_rcnn_model(image_input, roi_proposals,
label_targets, bbox_targets,
bbox_inside_weights, cfg)
if isinstance(loss, cntk.Variable):
loss = combine([loss])
if cfg["CNTK"].DEBUG_OUTPUT:
print("Storing graphs and models to %s." % cfg.OUTPUT_PATH)
plot(
loss,
os.path.join(cfg.OUTPUT_PATH,
"graph_frcn_train." + cfg["CNTK"].GRAPH_TYPE))
# Set learning parameters
lr_factor = cfg["CNTK"].LR_FACTOR
lr_per_sample_scaled = [
x * lr_factor for x in cfg["CNTK"].LR_PER_SAMPLE
]
mm_schedule = momentum_schedule(cfg["CNTK"].MOMENTUM_PER_MB)
l2_reg_weight = cfg["CNTK"].L2_REG_WEIGHT
epochs_to_train = cfg["CNTK"].MAX_EPOCHS
print("Using base model: {}".format(cfg["MODEL"].BASE_MODEL))
print("lr_per_sample: {}".format(lr_per_sample_scaled))
# --- train ---
# Instantiate the learners and the trainer object
params = loss.parameters
biases = [p for p in params if '.b' in p.name or 'b' == p.name]
others = [p for p in params if not p in biases]
bias_lr_mult = cfg["CNTK"].BIAS_LR_MULT
lr_schedule = learning_parameter_schedule_per_sample(
lr_per_sample_scaled)
learner = momentum_sgd(others,
lr_schedule,
mm_schedule,
l2_regularization_weight=l2_reg_weight,
unit_gain=False,
use_mean_gradient=True)
bias_lr_per_sample = [
v * bias_lr_mult for v in cfg["CNTK"].LR_PER_SAMPLE
]
bias_lr_schedule = learning_parameter_schedule_per_sample(
bias_lr_per_sample)
bias_learner = momentum_sgd(biases,
bias_lr_schedule,
mm_schedule,
l2_regularization_weight=l2_reg_weight,
unit_gain=False,
use_mean_gradient=True)
trainer = Trainer(None, (loss, pred_error), [learner, bias_learner])
# Get minibatches of images and perform model training
print("Training model for %s epochs." % epochs_to_train)
log_number_of_parameters(loss)
# Create the minibatch source
if cfg.USE_PRECOMPUTED_PROPOSALS:
proposal_provider = ProposalProvider.fromfile(
cfg["DATA"].TRAIN_PRECOMPUTED_PROPOSALS_FILE,
cfg.NUM_ROI_PROPOSALS)
else:
proposal_provider = ProposalProvider.fromconfig(cfg)
od_minibatch_source = ObjectDetectionMinibatchSource(
cfg["DATA"].TRAIN_MAP_FILE,
cfg["DATA"].TRAIN_ROI_FILE,
max_annotations_per_image=cfg.INPUT_ROIS_PER_IMAGE,
pad_width=cfg.IMAGE_WIDTH,
pad_height=cfg.IMAGE_HEIGHT,
pad_value=cfg["MODEL"].IMG_PAD_COLOR,
randomize=True,
use_flipping=cfg["TRAIN"].USE_FLIPPED,
max_images=cfg["DATA"].NUM_TRAIN_IMAGES,
num_classes=cfg["DATA"].NUM_CLASSES,
proposal_provider=proposal_provider,
provide_targets=True,
proposal_iou_threshold=cfg.BBOX_THRESH,
normalize_means=None
if not cfg.BBOX_NORMALIZE_TARGETS else cfg.BBOX_NORMALIZE_MEANS,
normalize_stds=None
if not cfg.BBOX_NORMALIZE_TARGETS else cfg.BBOX_NORMALIZE_STDS)
# define mapping from reader streams to network inputs
input_map = {
od_minibatch_source.image_si: image_input,
od_minibatch_source.proposals_si: roi_proposals,
od_minibatch_source.label_targets_si: label_targets,
od_minibatch_source.bbox_targets_si: bbox_targets,
od_minibatch_source.bbiw_si: bbox_inside_weights
}
progress_printer = ProgressPrinter(tag='Training',
num_epochs=epochs_to_train,
gen_heartbeat=True)
for epoch in range(epochs_to_train): # loop over epochs
sample_count = 0
while sample_count < cfg[
"DATA"].NUM_TRAIN_IMAGES: # loop over minibatches in the epoch
data = od_minibatch_source.next_minibatch(min(
cfg.MB_SIZE, cfg["DATA"].NUM_TRAIN_IMAGES - sample_count),
input_map=input_map)
trainer.train_minibatch(data) # update model with it
sample_count += trainer.previous_minibatch_sample_count # count samples processed so far
progress_printer.update_with_trainer(
trainer, with_metric=True) # log progress
if sample_count % 100 == 0:
print("Processed {} samples".format(sample_count))
progress_printer.epoch_summary(with_metric=True)
eval_model = create_fast_rcnn_eval_model(loss, image_input,
roi_proposals, cfg)
eval_model.save(cfg['MODEL_PATH'])
return eval_model