def get_variables(scope):
return tf.get_collection(tf.GraphKeys.GLOBAL_VARIABLES, scope)
def init_learner_state(self):
learner_init_op = tf.initialize_variables(
self.learner.learner.get_variables(tf.GraphKeys.GLOBAL_VARIABLES))
local_inits = tf.get_collection(tf.GraphKeys.LOCAL_INIT_OP)
with tf.control_dependencies(local_inits + [learner_init_op]):
return self.learner.assign_state(self.learner.initial_state())
def get_ckpt_var_map(ckpt_path, ckpt_scope, var_scope, skip_mismatch=None):
"""Get a var map for restoring from pretrained checkpoints.
Args:
ckpt_path: string. A pretrained checkpoint path.
ckpt_scope: string. Scope name for checkpoint variables.
var_scope: string. Scope name for model variables.
skip_mismatch: skip variables if shape mismatch.
Returns:
var_map: a dictionary from checkpoint name to model variables.
"""
logging.info('Init model from checkpoint {}'.format(ckpt_path))
if not ckpt_scope.endswith('/') or not var_scope.endswith('/'):
raise ValueError('Please specific scope name ending with /')
if ckpt_scope.startswith('/'):
ckpt_scope = ckpt_scope[1:]
if var_scope.startswith('/'):
var_scope = var_scope[1:]
var_map = {}
# Get the list of vars to restore.
model_vars = tf.get_collection(tf.GraphKeys.GLOBAL_VARIABLES,
scope=var_scope)
reader = tf.train.load_checkpoint(ckpt_path)
ckpt_var_name_to_shape = reader.get_variable_to_shape_map()
ckpt_var_names = set(reader.get_variable_to_shape_map().keys())
for i, v in enumerate(model_vars):
if not v.op.name.startswith(var_scope):
logging.info('skip {} -- does not match scope {}'.format(
v.op.name, var_scope))
ckpt_var = ckpt_scope + v.op.name[len(var_scope):]
if (ckpt_var not in ckpt_var_names
and v.op.name.endswith('/ExponentialMovingAverage')):
ckpt_var = ckpt_scope + v.op.name[:-len('/ExponentialMovingAverage'
)]
if ckpt_var not in ckpt_var_names:
if 'Momentum' in ckpt_var or 'RMSProp' in ckpt_var:
# Skip optimizer variables.
continue
if skip_mismatch:
logging.info('skip {} ({}) -- not in ckpt'.format(
v.op.name, ckpt_var))
continue
raise ValueError('{} is not in ckpt {}'.format(v.op, ckpt_path))
if v.shape != ckpt_var_name_to_shape[ckpt_var]:
if skip_mismatch:
logging.info('skip {} ({} vs {}) -- shape mismatch'.format(
v.op.name, v.shape, ckpt_var_name_to_shape[ckpt_var]))
continue
raise ValueError('shape mismatch {} ({} vs {})'.format(
v.op.name, v.shape, ckpt_var_name_to_shape[ckpt_var]))
if i < 5:
# Log the first few elements for sanity check.
logging.info('Init {} from ckpt var {}'.format(
v.op.name, ckpt_var))
var_map[ckpt_var] = v
return var_map
def gradients(ys, xs, grad_ys=None, checkpoints="collection", **kwargs):
"""Recompute gradients.
Authors: Tim Salimans & Yaroslav Bulatov
Modified by: Nikolay Zakirov
memory efficient gradient implementation inspired by
"Training Deep Nets with Sublinear Memory Cost"
by Chen et al. 2016 (https://arxiv.org/abs/1604.06174)
ys,xs,grad_ys,kwargs are the arguments to standard tensorflow tf.gradients
(https://www.tensorflow.org/versions/r0.12/api_docs/python/train.html#gradients)
'checkpoints' can either be
- a list consisting of tensors from the forward pass of the neural net
that we should re-use when calculating the gradients in the
backward pass
all other tensors that do not appear in this list will be re-computed
- a string or list specifying how this list should be determined.
currently we support
- 'speed': checkpoint all outputs of convolutions and matmuls.
these ops are usually the most expensive,
so checkpointing them maximizes the running speed
(this is a good option if nonlinearities, concats,
batchnorms, etc are taking up a lot of memory)
- 'memory': try to minimize the memory usage
(currently using a very simple strategy that
identifies a number of bottleneck tensors in the
graph to checkpoint)
- 'collection': look for a tensorflow collection named
'checkpoints', which holds the tensors to checkpoint
- a list: a list of strings to be matched in the names of
the tensors
"""
# print("Calling memsaving gradients with", checkpoints)
if not isinstance(ys, list):
ys = [ys]
if not isinstance(xs, list):
xs = [xs]
bwd_ops = ge.get_backward_walk_ops([y.op for y in ys], inclusive=True)
logging.debug("bwd_ops: %s", len(bwd_ops))
# forward ops are all ops that are candidates for recomputation
fwd_ops = ge.get_forward_walk_ops([x.op for x in xs],
inclusive=True,
within_ops=bwd_ops)
logging.debug("fwd_ops: %s", len(fwd_ops))
# exclude ops with no inputs
fwd_ops = [op for op in fwd_ops if op.inputs]
logging.debug("fwd_ops: %s", len(fwd_ops))
# don't recompute xs, remove variables
xs_ops = _to_ops(xs)
fwd_ops = [op for op in fwd_ops if op not in xs_ops]
fwd_ops = [op for op in fwd_ops if "/assign" not in op.name]
fwd_ops = [op for op in fwd_ops if "/Assign" not in op.name]
fwd_ops = [op for op in fwd_ops if "/read" not in op.name]
logging.debug("fwd_ops: %s", len(fwd_ops))
ts_all = ge.filter_ts(fwd_ops, True) # get the tensors
logging.debug("ts_all: %s", len(ts_all))
ts_all = [t for t in ts_all if "/read" not in t.name]
ts_all = set(ts_all) - set(xs) - set(ys)
logging.debug("ts_all: %s", len(ts_all))
# construct list of tensors to checkpoint during forward pass, if not
# given as input
if not isinstance(checkpoints, list):
if checkpoints == "collection":
checkpoints = tf.get_collection("checkpoints")
elif checkpoints == "speed":
# checkpoint all expensive ops to maximize running speed
checkpoints = ge.filter_ts_from_regex(fwd_ops,
"conv2d|Conv|MatMul")
elif checkpoints == "memory":
# remove very small tensors and some weird ops
def fixdims(
t
): # tf.Dimension values are not compatible with int, convert manually
try:
return [
int(e if e is not None else 64) for e in t.as_list()
]
except AttributeError as e:
logging.exception("%s", e)
logging.exception("unknown shape %s", t)
return [0] # unknown shape
ts_all = [
t for t in ts_all
if np.prod(fixdims(t.shape)) > MIN_CHECKPOINT_NODE_SIZE
# if (tf.size(t) > MIN_CHECKPOINT_NODE_SIZE)
]
logging.debug("ts_all: %s", len(ts_all))
ts_all = [t for t in ts_all if "L2Loss" not in t.name]
ts_all = [t for t in ts_all if "entropy" not in t.name]
ts_all = [t for t in ts_all if "FusedBatchNorm" not in t.name]
ts_all = [t for t in ts_all if "Switch" not in t.name]
ts_all = [t for t in ts_all if "dropout" not in t.name]
# DV: FP16_FIX - need to add 'Cast' layer here to make it work for FP16
ts_all = [t for t in ts_all if "Cast" not in t.name]
logging.debug("ts_all: %s", len(ts_all))
# filter out all tensors that are inputs of the backward graph
with util.capture_ops() as bwd_ops:
tf_gradients(ys, xs, grad_ys, **kwargs)
bwd_inputs = [t for op in bwd_ops for t in op.inputs]
# list of tensors in forward graph that is in input to bwd graph
ts_filtered = list(set(bwd_inputs).intersection(ts_all))
debug_print("Using tensors %s", ts_filtered)
# try two slightly different ways of getting bottlenecks tensors
# to checkpoint
logging.debug("len(ts_filtered): %s", len(ts_filtered))
logging.debug("len(ts_all) %s", len(ts_all))
for ts in [ts_filtered, ts_all]:
# get all bottlenecks in the graph
bottleneck_ts = []
for t in ts:
b = set(
ge.get_backward_walk_ops(t.op,
inclusive=True,
within_ops=fwd_ops))
f = set(
ge.get_forward_walk_ops(t.op,
inclusive=False,
within_ops=fwd_ops))
# check that there are no shortcuts
b_inp = {inp
for op in b
for inp in op.inputs}.intersection(ts_all)
f_inp = {inp
for op in f
for inp in op.inputs}.intersection(ts_all)
if not set(b_inp).intersection(
f_inp) and len(b_inp) + len(f_inp) >= len(ts_all):
bottleneck_ts.append(t) # we have a bottleneck!
else:
logging.debug(
"Rejected bottleneck candidate and ops %s %d", [t],
len(b_inp) + len(f_inp) - len(ts_all))
# success? or try again without filtering?
if len(bottleneck_ts) >= np.sqrt(
len(ts_filtered)): # yes, enough bottlenecks found!
break
# bottleneck_ts = [t for t in ts_all if 'Add' in t.name]
# logging.debug("Add only ts_all: %s", len(bottleneck_ts))
if not bottleneck_ts:
raise Exception(
"unable to find bottleneck tensors! please provide checkpoint "
'nodes manually, or use checkpoints="speed" or a list of strings.'
)
logging.debug("len(bottleneck_ts): %s", len(bottleneck_ts))
# sort the bottlenecks
bottlenecks_sorted_lists = tf_toposort(bottleneck_ts,
within_ops=fwd_ops)
sorted_bottlenecks = [
t for ts in bottlenecks_sorted_lists for t in ts
]
# save an approximately optimal number ~ sqrt(N)
n_filtered = len(ts_filtered)
if len(bottleneck_ts) <= np.ceil(np.sqrt(n_filtered)):
checkpoints = sorted_bottlenecks
else:
step = int(np.ceil(len(bottleneck_ts) / np.sqrt(n_filtered)))
checkpoints = sorted_bottlenecks[step::step]
else:
raise Exception('%s is unsupported input for "checkpoints"' %
(checkpoints, ))
else:
# exclude some layers as was done in the original bottleneck searching
# algorithm
for excl_layer in [
"L2Loss", "entropy", "FusedBatchNorm", "Switch", "dropout",
"Cast"
]:
ts_all = [t for t in ts_all if excl_layer not in t.name]
logging.info("Excluding %s from ts_all: %d", excl_layer,
len(ts_all))
# leave only layers that match strings in checkpoints list
ts_all = [
t for t in ts_all
if any(partial_match in t.name for partial_match in checkpoints)
]
logging.info("Leaving only %s in ts_all: %d", checkpoints, len(ts_all))
checkpoints = ts_all.copy()
checkpoints = list(set(checkpoints).intersection(ts_all))
# at this point selection happened and checkpoints is list of nodes
# assert isinstance(checkpoints, list)
# TODO(nikzak): implement multithreading in graph recomputation
logging.info("Checkpoint nodes used: %s", len(checkpoints))
# better error handling of special cases
# xs are already handled as checkpoint nodes, so no need to include them
xs_intersect_checkpoints = set(xs).intersection(set(checkpoints))
if xs_intersect_checkpoints:
debug_print("Warning, some input nodes are also checkpoint nodes: %s",
xs_intersect_checkpoints)
ys_intersect_checkpoints = set(ys).intersection(set(checkpoints))
debug_print("ys: %s, checkpoints: %s, intersect: %s", ys, checkpoints,
ys_intersect_checkpoints)
# saving an output node (ys) gives no benefit in memory while creating
# new edge cases, exclude them
if ys_intersect_checkpoints:
debug_print(
"Warning, some output nodes are also checkpoints nodes: %s",
format_ops(ys_intersect_checkpoints))
# remove initial and terminal nodes from checkpoints list if present
checkpoints = list(set(checkpoints) - set(ys) - set(xs))
logging.info("Pruned initial and terminal nodes. Leaving %d",
len(checkpoints))
# check that we have some nodes to checkpoint
if not checkpoints:
raise Exception("no checkpoints nodes found or given as input! ")
# disconnect dependencies between checkpointed tensors
checkpoints_disconnected = {}
for x in checkpoints:
if x.op and x.op.name is not None:
grad_node = tf.stop_gradient(x, name=x.op.name + "_sg")
else:
grad_node = tf.stop_gradient(x)
grad_node.op._set_device(x.op.node_def.device)
checkpoints_disconnected[x] = grad_node
# partial derivatives to the checkpointed tensors and xs
ops_to_copy = fast_backward_ops(seed_ops=[y.op for y in ys],
stop_at_ts=checkpoints,
within_ops=fwd_ops)
debug_print("Found %s ops to copy within fwd_ops %s, seed %s, stop_at %s",
len(ops_to_copy), fwd_ops, [r.op for r in ys], checkpoints)
debug_print("ops_to_copy = %s", ops_to_copy)
debug_print("Processing list %s", ys)
_, info = ge.copy_with_input_replacements(ge.sgv(ops_to_copy), {})
for origin_op, op in info._transformed_ops.items():
op._set_device(origin_op.node_def.device)
copied_ops = info._transformed_ops.values()
debug_print("Copied %s to %s", ops_to_copy, copied_ops)
ge.reroute_ts(checkpoints_disconnected.values(),
checkpoints_disconnected.keys(),
can_modify=copied_ops)
debug_print("Rewired %s in place of %s restricted to %s",
checkpoints_disconnected.values(),
checkpoints_disconnected.keys(), copied_ops)
# get gradients with respect to current boundary + original x's
copied_ys = [info._transformed_ops[y.op]._outputs[0] for y in ys]
boundary = list(checkpoints_disconnected.values())
dv = tf_gradients(ys=copied_ys,
xs=boundary + xs,
grad_ys=grad_ys,
**kwargs)
debug_print("Got gradients %s", dv)
debug_print("for %s", copied_ys)
debug_print("with respect to %s", boundary + xs)
inputs_to_do_before = [y.op for y in ys]
if grad_ys is not None:
inputs_to_do_before += grad_ys
wait_to_do_ops = list(copied_ops) + [g.op for g in dv if g is not None]
my_add_control_inputs(wait_to_do_ops, inputs_to_do_before)
# partial derivatives to the checkpointed nodes
# dictionary of "node: backprop" for nodes in the boundary
d_checkpoints = dict(
zip(checkpoints_disconnected.keys(),
dv[:len(checkpoints_disconnected)]))
# partial derivatives to xs (usually the params of the neural net)
d_xs = dv[len(checkpoints_disconnected):]
# incorporate derivatives flowing through the checkpointed nodes
logging.info("Sorting nodes topologically")
checkpoints_sorted_lists = tf_toposort(checkpoints, within_ops=fwd_ops)
logging.info("Rebuilding graph with %d checkpoints",
len(checkpoints_sorted_lists))
for index, ts in enumerate(checkpoints_sorted_lists[::-1]):
if index % 50 == 0:
logging.info("Processed %d nodes", index)
debug_print("Processing list %s", ts)
checkpoints_other = [r for r in checkpoints if r not in ts]
checkpoints_disconnected_other = [
checkpoints_disconnected[r] for r in checkpoints_other
]
# copy part of the graph below current checkpoint node, stopping at
# other checkpoints nodes
ops_to_copy = fast_backward_ops(within_ops=fwd_ops,
seed_ops=[r.op for r in ts],
stop_at_ts=checkpoints_other)
debug_print("Found %s ops to copy within %s, seed %s, stop_at %s",
len(ops_to_copy), fwd_ops, [r.op for r in ts],
checkpoints_other)
debug_print("ops_to_copy = %s", ops_to_copy)
if not ops_to_copy: # we're done!
break
_, info = ge.copy_with_input_replacements(ge.sgv(ops_to_copy), {})
for origin_op, op in info._transformed_ops.items():
op._set_device(origin_op.node_def.device)
copied_ops = info._transformed_ops.values()
debug_print("Copied %s to %s", ops_to_copy, copied_ops)
ge.reroute_ts(checkpoints_disconnected_other,
checkpoints_other,
can_modify=copied_ops)
debug_print("Rewired %s in place of %s restricted to %s",
checkpoints_disconnected_other, checkpoints_other,
copied_ops)
# gradient flowing through the checkpointed node
boundary = [info._transformed_ops[r.op]._outputs[0] for r in ts]
substitute_backprops = [d_checkpoints[r] for r in ts]
dv = tf_gradients(boundary,
checkpoints_disconnected_other + xs,
grad_ys=substitute_backprops,
**kwargs)
debug_print("Got gradients %s", dv)
debug_print("for %s", boundary)
debug_print("with respect to %s", checkpoints_disconnected_other + xs)
debug_print("with boundary backprop substitutions %s",
substitute_backprops)
inputs_to_do_before = [d_checkpoints[r].op for r in ts]
wait_to_do_ops = list(copied_ops) + [g.op for g in dv if g is not None]
my_add_control_inputs(wait_to_do_ops, inputs_to_do_before)
# partial derivatives to the checkpointed nodes
for r, dr in zip(checkpoints_other, dv[:len(checkpoints_other)]):
if dr is not None:
if d_checkpoints[r] is None:
d_checkpoints[r] = dr
else:
d_checkpoints[r] += dr
def _unsparsify(x):
if not isinstance(x, tf.IndexedSlices):
return x
if x.dense_shape is None:
raise ValueError(
"memory_saving_gradients has sparse gradients of unknown shape."
)
indices = x.indices
while indices.shape.ndims < x.values.shape.ndims:
indices = tf.expand_dims(indices, -1)
return tf.scatter_nd(indices, x.values, x.dense_shape)
# partial derivatives to xs (usually the params of the neural net)
d_xs_new = dv[len(checkpoints_other):]
for j in range(len(xs)):
if d_xs_new[j] is not None:
if d_xs[j] is None:
d_xs[j] = _unsparsify(d_xs_new[j])
else:
d_xs[j] += _unsparsify(d_xs_new[j])
return d_xs
def vars(self):
return tf.get_collection(tf.GraphKeys.GLOBAL_VARIABLES,
scope=self.name_scope)
def train(self,
input_fn,
checkpoint_path=None,
save_checkpoint_steps=None):
if self._cluster_spec is not None:
device_fn = tf.train.replica_device_setter(
worker_device="/job:worker/task:%d" % self._worker_rank,
merge_devices=True,
cluster=self._cluster_spec)
cluster_def = self._cluster_spec.as_cluster_def()
local_address = self._cluster_spec.job_tasks('worker')[
self._worker_rank]
server = tf.train.Server(tf.train.ClusterSpec(
{'local': {
0: local_address
}}),
job_name='local',
task_index=0)
target = 'grpc://' + local_address
else:
device_fn = None
cluster_def = None
target = None
config = tf.ConfigProto(cluster_def=cluster_def)
config.inter_op_parallelism_threads = 4
config.intra_op_parallelism_threads = 4
config.experimental.share_session_state_in_clusterspec_propagation \
= True
tf.config.set_soft_device_placement(False)
with tf.Graph().as_default() as g:
with tf.device(device_fn):
features, labels = self._get_features_and_labels_from_input_fn(
input_fn, ModeKeys.TRAIN)
spec, _ = self._get_model_spec(features, labels,
ModeKeys.TRAIN)
# Explicitly add a Saver
if not tf.get_collection(tf.GraphKeys.SAVERS):
saver = tf.train.Saver(
sharded=True, defer_build=True,
save_relative_paths=True) # Must set for portability
tf.add_to_collection(tf.GraphKeys.SAVERS, saver)
self._bridge.connect()
with tf.train.MonitoredTrainingSession(
master=target,
config=config,
is_chief=(self._worker_rank == 0),
checkpoint_dir=checkpoint_path,
save_checkpoint_steps=save_checkpoint_steps,
hooks=spec.training_hooks) as sess:
iter_id = 0
while not sess.should_stop():
self._bridge.start(iter_id)
logging.debug('after bridge start.')
sess.run(spec.train_op, feed_dict={})
logging.debug('after session run.')
self._bridge.commit()
logging.debug('after bridge commit.')
iter_id += 1
if self._cluster_spec is not None:
self._cheif_barriar(is_chief=(self._worker_rank == 0))
self._bridge.terminate()
return self
def train():
with tf.Graph().as_default():
with tf.device('/gpu:' + str(GPU_INDEX)):
pointclouds_pl, labels_pl = MODEL.placeholder_inputs(
BATCH_SIZE, NUM_POINT)
is_training_pl = tf.placeholder(tf.bool, shape=())
# Note the global_step=batch parameter to minimize.
# That tells the optimizer to helpfully increment the 'batch' parameter
# for you every time it trains.
batch = tf.get_variable('batch', [],
initializer=tf.constant_initializer(0),
trainable=False)
bn_decay = get_bn_decay(batch)
tf.summary.scalar('bn_decay', bn_decay)
# Get model and loss
pred, end_points = MODEL.get_model(pointclouds_pl,
is_training_pl,
bn_decay=bn_decay)
MODEL.get_loss(pred, labels_pl, end_points)
losses = tf.get_collection('losses')
total_loss = tf.add_n(losses, name='total_loss')
tf.summary.scalar('total_loss', total_loss)
for l in losses + [total_loss]:
tf.summary.scalar(l.op.name, l)
correct = tf.equal(tf.argmax(pred, 1), tf.to_int64(labels_pl))
accuracy = tf.reduce_sum(tf.cast(correct,
tf.float32)) / float(BATCH_SIZE)
tf.summary.scalar('accuracy', accuracy)
print "--- Get training operator"
# Get training operator
learning_rate = get_learning_rate(batch)
tf.summary.scalar('learning_rate', learning_rate)
if OPTIMIZER == 'momentum':
optimizer = tf.train.MomentumOptimizer(learning_rate,
momentum=MOMENTUM)
elif OPTIMIZER == 'adam':
optimizer = tf.train.AdamOptimizer(learning_rate)
train_op = optimizer.minimize(total_loss, global_step=batch)
# Add ops to save and restore all the variables.
saver = tf.train.Saver()
# Create a session
config = tf.ConfigProto()
config.gpu_options.allow_growth = True
config.allow_soft_placement = True
config.log_device_placement = False
sess = tf.Session(config=config)
# Add summary writers
merged = tf.summary.merge_all()
train_writer = tf.summary.FileWriter(os.path.join(LOG_DIR, 'train'),
sess.graph)
test_writer = tf.summary.FileWriter(os.path.join(LOG_DIR, 'test'),
sess.graph)
# Init variables
init = tf.global_variables_initializer()
sess.run(init)
ops = {
'pointclouds_pl': pointclouds_pl,
'labels_pl': labels_pl,
'is_training_pl': is_training_pl,
'pred': pred,
'loss': total_loss,
'train_op': train_op,
'merged': merged,
'step': batch,
'end_points': end_points
}
best_acc = -1
for epoch in range(MAX_EPOCH):
log_string('**** EPOCH %03d ****' % (epoch))
sys.stdout.flush()
train_one_epoch(sess, ops, train_writer)
eval_one_epoch(sess, ops, test_writer)
# Save the variables to disk.
if epoch % 10 == 0:
save_path = saver.save(sess,
os.path.join(LOG_DIR, "model.ckpt"))
log_string("Model saved in file: %s" % save_path)
def get_weights():
return tf.get_collection(_WEIGHT_COLLECTION)
def get_scalar_summaries():
"""Returns the list of (name, Tensor) summaries recorded by scalar()."""
return tf.get_collection('edsummaries')
def get_masks():
return tf.get_collection(_MASK_COLLECTION)
def get_thresholds():
return tf.get_collection(_THRESHOLD_COLLECTION)
def get_masked_weights():
return tf.get_collection(_MASKED_WEIGHT_COLLECTION)
def __init__(self, args):
# inputs/mask.shape=(128, None) 'None' in shape means any number seq_length.shape=(128,)
inputs = tf.placeholder(shape=(args.batch_size, None),
dtype=tf.int32,
name='inputs')
mask = tf.placeholder(shape=(args.batch_size, None),
dtype=tf.float32,
name='inputs_mask')
seq_length = tf.placeholder(shape=args.batch_size,
dtype=tf.float32,
name='seq_length')
self.input_form = [inputs, mask, seq_length]
# all shape=(128, None)
encoder_inputs = inputs
decoder_inputs = tf.concat(
[tf.zeros(shape=(args.batch_size, 1), dtype=tf.int32), inputs],
axis=1)
decoder_targets = tf.concat(
[inputs,
tf.zeros(shape=(args.batch_size, 1), dtype=tf.int32)],
axis=1)
decoder_mask = tf.concat(
[mask,
tf.zeros(shape=(args.batch_size, 1), dtype=tf.float32)],
axis=1)
# map size
x_size = out_size = args.map_size[0] * args.map_size[1]
# embeddings.shape=(16900, 32) tf.random_uniform(shape, minval=0, maxval=None, ...)
# x_latent_size is the input embedding size = 32
embeddings = tf.Variable(tf.random_uniform(
[x_size, args.x_latent_size], -1.0, 1.0),
dtype=tf.float32)
# tf.nn.embedding_lookup(params, ids, ...) Looks up ids in a list of embedding tensors.
# shape=(128, None, 32)
encoder_inputs_embedded = tf.nn.embedding_lookup(
embeddings, encoder_inputs)
decoder_inputs_embedded = tf.nn.embedding_lookup(
embeddings, decoder_inputs)
with tf.variable_scope("encoder"):
# create a GRUCell output_size = state_size = 256
encoder_cell = tf.nn.rnn_cell.GRUCell(args.rnn_size)
# tf.compat.v1.nn.dynamic_rnn(cell, inputs, ...) = keras.layers.RNN(cell)
# returns (outputs, state)
# 'outputs' is a tensor of shape [batch_size, max_time, cell_output_size]
# 'state' is a tensor of shape [batch_size, cell_state_size] = (128, 256)
_, encoder_final_state = tf.nn.dynamic_rnn(
encoder_cell,
encoder_inputs_embedded,
sequence_length=seq_length,
dtype=tf.float32,
)
# tf.compat.v1.get_variable(name, shape=None, dtype=None,
# initializer=None, ...)
mu_w = tf.get_variable("mu_w", [args.rnn_size, args.rnn_size],
tf.float32,
tf.random_normal_initializer(stddev=0.02))
mu_b = tf.get_variable("mu_b", [args.rnn_size], tf.float32,
tf.constant_initializer(0.0))
sigma_w = tf.get_variable("sigma_w", [args.rnn_size, args.rnn_size],
tf.float32,
tf.random_normal_initializer(stddev=0.02))
sigma_b = tf.get_variable("sigma_b", [args.rnn_size], tf.float32,
tf.constant_initializer(0.0))
# all shape=(128, 256)
mu = tf.matmul(encoder_final_state, mu_w) + mu_b
log_sigma_sq = tf.matmul(encoder_final_state, sigma_w) + sigma_b
eps = tf.random_normal(shape=tf.shape(log_sigma_sq),
mean=0,
stddev=1,
dtype=tf.float32)
if args.eval:
z = tf.zeros(shape=(args.batch_size, args.rnn_size),
dtype=tf.float32)
else:
# Re-parameterization trick
z = mu + tf.sqrt(tf.exp(log_sigma_sq)) * eps
self.batch_post_embedded = z
with tf.variable_scope("decoder"):
decoder_cell = tf.nn.rnn_cell.GRUCell(args.rnn_size)
decoder_init_state = z
decoder_outputs, _ = tf.nn.dynamic_rnn(
decoder_cell,
decoder_inputs_embedded,
initial_state=decoder_init_state,
sequence_length=seq_length,
dtype=tf.float32,
)
# out_size = 16900
out_w = tf.get_variable("out_w", [out_size, args.rnn_size], tf.float32,
tf.random_normal_initializer(stddev=0.02))
out_b = tf.get_variable("out_b", [out_size], tf.float32,
tf.constant_initializer(0.0))
# tf.reduce_mean(input_tensor, axis=None, ...) Reduces input_tensor to mean value along the given axis.
# tf.reshape(tensor, shape, name=None) Reshape the tensor into given shape, -1 indicates calculated value.
# tf.nn.sampled_softmax_loss() A fast way to train softmax classifier, usually an underestimate (for training only).
batch_rec_loss = tf.reduce_mean(
decoder_mask * tf.reshape(
tf.nn.sampled_softmax_loss(
weights=out_w,
biases=out_b,
labels=tf.reshape(decoder_targets, [-1, 1]),
inputs=tf.reshape(decoder_outputs, [-1, args.rnn_size]),
num_sampled=args.neg_size,
num_classes=out_size), [args.batch_size, -1]),
axis=-1 # reduce to mean along the last dimension
)
batch_latent_loss = -0.5 * tf.reduce_sum(
1 + log_sigma_sq - tf.square(mu) - tf.exp(log_sigma_sq), axis=1)
self.rec_loss = rec_loss = tf.reduce_mean(batch_rec_loss)
self.latent_loss = latent_loss = tf.reduce_mean(batch_latent_loss)
self.loss = loss = tf.reduce_mean([rec_loss, latent_loss])
self.train_op = tf.train.AdamOptimizer(
args.learning_rate).minimize(loss)
target_out_w = tf.nn.embedding_lookup(out_w, decoder_targets)
target_out_b = tf.nn.embedding_lookup(out_b, decoder_targets)
self.batch_likelihood = tf.reduce_mean(decoder_mask * tf.log_sigmoid(
tf.reduce_sum(decoder_outputs * target_out_w, -1) + target_out_b),
axis=-1,
name="batch_likelihood")
# save/restore variables to/from checkpoints, max_to_keep = max #recent checkpoint files to keep.
saver = tf.train.Saver(tf.get_collection(
tf.GraphKeys.TRAINABLE_VARIABLES),
max_to_keep=10)
self.save, self.restore = saver.save, saver.restore
def get_trainable_variables(scope):
return tf.get_collection(tf.GraphKeys.TRAINABLE_VARIABLES, scope)
def predict_and_report(self,
sequences,
labels,
W_embed,
report=True,
file=False):
"""
PURPOSE: Prediction using best model on provided examples and generating
report if indicated and labels are provided.
ARGS:
sequences (list(list)) order of product numbers
labels (list) order class labels
W_embed (list(list)) trained word embedding Matrix
report (bool) indicator for whether a report is generated
"""
from sklearn.metrics import confusion_matrix, classification_report
import json
with tf.Session(graph=self.graph) as sess:
_, saver_ = tf.get_collection('Init_Save_ops')
saver_.restore(sess, self.final_ckpt)
logits_ = self.graph.get_tensor_by_name(
'OutputLyr/Logits_lyr/BiasAdd:0')
sequences_, W_embed_, Y_, training_ = tf.get_collection(
"Input_var")
self.logits_prediction = logits_.eval(feed_dict={
W_embed_: W_embed,
sequences_: sequences,
training_: False
})
self.class_prediction = np.argmax(self.logits_prediction, axis=1)
confusion_mat = confusion_matrix(labels, self.class_prediction)
true_neg = confusion_mat[0, 0] / (confusion_mat[0, 0] +
confusion_mat[1, 0])
false_neg = confusion_mat[0, 1] / (confusion_mat[0, 1] +
confusion_mat[1, 1])
ratio = true_neg / false_neg
if report:
print('-----------{}-----------'.format('Confusion Matrix'))
print(confusion_mat, '\n')
print(
'-----------{}-----------'.format('Classification Report'))
print(classification_report(labels, self.class_prediction))
print('True Negative:', true_neg)
print('False Negative:', false_neg)
print('Upper Constraint:', ratio)
if file:
summary_dict = self.__dict__.copy()
class_report_dict = classification_report(
labels, self.class_prediction, output_dict=True)
summary_dict.update(class_report_dict)
summary_dict.update({
'true_negative': true_neg,
'false_negative': false_neg,
'upper_constraint': ratio
})
summary_dict.pop('graph', None)
summary_dict.pop('logits_prediction', None)
summary_dict.pop('class_prediction', None)
with open(self.summary_file, 'w') as file:
json.dump(summary_dict, file, indent=2)
with open(self.most_recent_summary_file, 'w') as file:
json.dump(summary_dict, file, indent=2)
def inception_model_fn(features, labels, mode, params):
"""Inception v3 model using Estimator API."""
num_classes = FLAGS.num_classes
is_training = (mode == tf.estimator.ModeKeys.TRAIN)
is_eval = (mode == tf.estimator.ModeKeys.EVAL)
if isinstance(features, dict):
features = features['feature']
features = tensor_transform_fn(features, params['input_perm'])
# This nested function allows us to avoid duplicating the logic which
# builds the network, for different values of --precision.
def build_network():
if FLAGS.precision == 'bfloat16':
with contrib_tpu.bfloat16_scope():
logits, end_points = inception.inception_v3(
features, num_classes, is_training=is_training)
logits = tf.cast(logits, tf.float32)
elif FLAGS.precision == 'float32':
logits, end_points = inception.inception_v3(
features, num_classes, is_training=is_training)
return logits, end_points
if FLAGS.clear_update_collections:
# updates_collections must be set to None in order to use fused batchnorm
with arg_scope(
inception.inception_v3_arg_scope(
weight_decay=0.0,
batch_norm_decay=BATCH_NORM_DECAY,
batch_norm_epsilon=BATCH_NORM_EPSILON,
updates_collections=None)):
logits, end_points = build_network()
else:
with arg_scope(
inception.inception_v3_arg_scope(
batch_norm_decay=BATCH_NORM_DECAY,
batch_norm_epsilon=BATCH_NORM_EPSILON)):
logits, end_points = build_network()
predictions = {
'classes': tf.argmax(input=logits, axis=1),
'probabilities': tf.nn.softmax(logits, name='softmax_tensor')
}
if mode == tf.estimator.ModeKeys.PREDICT:
return tf.estimator.EstimatorSpec(
mode=mode,
predictions=predictions,
export_outputs={
'classify': tf.estimator.export.PredictOutput(predictions)
})
if mode == tf.estimator.ModeKeys.EVAL and FLAGS.display_tensors and (
not FLAGS.use_tpu):
with tf.control_dependencies([
tf.Print(predictions['classes'], [predictions['classes']],
summarize=FLAGS.eval_batch_size,
message='prediction: ')
]):
labels = tf.Print(labels, [labels],
summarize=FLAGS.eval_batch_size,
message='label: ')
one_hot_labels = tf.one_hot(labels, FLAGS.num_classes, dtype=tf.int32)
if 'AuxLogits' in end_points:
tf.losses.softmax_cross_entropy(onehot_labels=one_hot_labels,
logits=tf.cast(end_points['AuxLogits'],
tf.float32),
weights=0.4,
label_smoothing=0.1,
scope='aux_loss')
tf.losses.softmax_cross_entropy(onehot_labels=one_hot_labels,
logits=logits,
weights=1.0,
label_smoothing=0.1)
losses = tf.add_n(tf.losses.get_losses())
l2_loss = []
for v in tf.trainable_variables():
if 'BatchNorm' not in v.name and 'weights' in v.name:
l2_loss.append(tf.nn.l2_loss(v))
loss = losses + WEIGHT_DECAY * tf.add_n(l2_loss)
initial_learning_rate = FLAGS.learning_rate * FLAGS.train_batch_size / 256
if FLAGS.use_learning_rate_warmup:
# Adjust initial learning rate to match final warmup rate
warmup_decay = FLAGS.learning_rate_decay**(
(FLAGS.warmup_epochs + FLAGS.cold_epochs) /
FLAGS.learning_rate_decay_epochs)
adj_initial_learning_rate = initial_learning_rate * warmup_decay
final_learning_rate = 0.0001 * initial_learning_rate
host_call = None
train_op = None
if is_training:
batches_per_epoch = _NUM_TRAIN_IMAGES / FLAGS.train_batch_size
global_step = tf.train.get_or_create_global_step()
current_epoch = tf.cast(
(tf.cast(global_step, tf.float32) / batches_per_epoch), tf.int32)
learning_rate = tf.train.exponential_decay(
learning_rate=initial_learning_rate,
global_step=global_step,
decay_steps=int(FLAGS.learning_rate_decay_epochs *
batches_per_epoch),
decay_rate=FLAGS.learning_rate_decay,
staircase=True)
if FLAGS.use_learning_rate_warmup:
wlr = 0.1 * adj_initial_learning_rate
wlr_height = tf.cast(
0.9 * adj_initial_learning_rate /
(FLAGS.warmup_epochs + FLAGS.learning_rate_decay_epochs - 1),
tf.float32)
epoch_offset = tf.cast(FLAGS.cold_epochs - 1, tf.int32)
exp_decay_start = (FLAGS.warmup_epochs + FLAGS.cold_epochs +
FLAGS.learning_rate_decay_epochs)
lin_inc_lr = tf.add(
wlr,
tf.multiply(
tf.cast(tf.subtract(current_epoch, epoch_offset),
tf.float32), wlr_height))
learning_rate = tf.where(
tf.greater_equal(current_epoch, FLAGS.cold_epochs),
(tf.where(tf.greater_equal(current_epoch, exp_decay_start),
learning_rate, lin_inc_lr)), wlr)
# Set a minimum boundary for the learning rate.
learning_rate = tf.maximum(learning_rate,
final_learning_rate,
name='learning_rate')
if FLAGS.optimizer == 'sgd':
tf.logging.info('Using SGD optimizer')
optimizer = tf.train.GradientDescentOptimizer(
learning_rate=learning_rate)
elif FLAGS.optimizer == 'momentum':
tf.logging.info('Using Momentum optimizer')
optimizer = tf.train.MomentumOptimizer(learning_rate=learning_rate,
momentum=0.9)
elif FLAGS.optimizer == 'RMS':
tf.logging.info('Using RMS optimizer')
optimizer = tf.train.RMSPropOptimizer(learning_rate,
RMSPROP_DECAY,
momentum=RMSPROP_MOMENTUM,
epsilon=RMSPROP_EPSILON)
else:
tf.logging.fatal('Unknown optimizer:', FLAGS.optimizer)
if FLAGS.use_tpu:
optimizer = contrib_tpu.CrossShardOptimizer(optimizer)
update_ops = tf.get_collection(tf.GraphKeys.UPDATE_OPS)
with tf.control_dependencies(update_ops):
train_op = optimizer.minimize(loss, global_step=global_step)
if FLAGS.moving_average:
ema = tf.train.ExponentialMovingAverage(decay=MOVING_AVERAGE_DECAY,
num_updates=global_step)
variables_to_average = (tf.trainable_variables() +
tf.moving_average_variables())
with tf.control_dependencies([train_op
]), tf.name_scope('moving_average'):
train_op = ema.apply(variables_to_average)
# To log the loss, current learning rate, and epoch for Tensorboard, the
# summary op needs to be run on the host CPU via host_call. host_call
# expects [batch_size, ...] Tensors, thus reshape to introduce a batch
# dimension. These Tensors are implicitly concatenated to
# [params['batch_size']].
gs_t = tf.reshape(global_step, [1])
loss_t = tf.reshape(loss, [1])
lr_t = tf.reshape(learning_rate, [1])
ce_t = tf.reshape(current_epoch, [1])
if not FLAGS.skip_host_call:
def host_call_fn(gs, loss, lr, ce):
"""Training host call. Creates scalar summaries for training metrics.
This function is executed on the CPU and should not directly reference
any Tensors in the rest of the `model_fn`. To pass Tensors from the
model to the `metric_fn`, provide them as part of the `host_call`. See
https://www.tensorflow.org/api_docs/python/tf/contrib/tpu/TPUEstimatorSpec
for more information.
Arguments should match the list of `Tensor` objects passed as the second
element in the tuple passed to `host_call`.
Args:
gs: `Tensor with shape `[batch]` for the global_step
loss: `Tensor` with shape `[batch]` for the training loss.
lr: `Tensor` with shape `[batch]` for the learning_rate.
ce: `Tensor` with shape `[batch]` for the current_epoch.
Returns:
List of summary ops to run on the CPU host.
"""
gs = gs[0]
with summary.create_file_writer(FLAGS.model_dir).as_default():
with summary.always_record_summaries():
summary.scalar('loss', tf.reduce_mean(loss), step=gs)
summary.scalar('learning_rate',
tf.reduce_mean(lr),
step=gs)
summary.scalar('current_epoch',
tf.reduce_mean(ce),
step=gs)
return summary.all_summary_ops()
host_call = (host_call_fn, [gs_t, loss_t, lr_t, ce_t])
eval_metrics = None
if is_eval:
def metric_fn(labels, logits):
"""Evaluation metric function. Evaluates accuracy.
This function is executed on the CPU and should not directly reference
any Tensors in the rest of the `model_fn`. To pass Tensors from the model
to the `metric_fn`, provide as part of the `eval_metrics`. See
https://www.tensorflow.org/api_docs/python/tf/contrib/tpu/TPUEstimatorSpec
for more information.
Arguments should match the list of `Tensor` objects passed as the second
element in the tuple passed to `eval_metrics`.
Args:
labels: `Tensor` with shape `[batch, ]`.
logits: `Tensor` with shape `[batch, num_classes]`.
Returns:
A dict of the metrics to return from evaluation.
"""
predictions = tf.argmax(logits, axis=1)
top_1_accuracy = tf.metrics.accuracy(labels, predictions)
in_top_5 = tf.cast(tf.nn.in_top_k(logits, labels, 5), tf.float32)
top_5_accuracy = tf.metrics.mean(in_top_5)
return {
'accuracy': top_1_accuracy,
'accuracy@5': top_5_accuracy,
}
eval_metrics = (metric_fn, [labels, logits])
return contrib_tpu.TPUEstimatorSpec(mode=mode,
loss=loss,
train_op=train_op,
host_call=host_call,
eval_metrics=eval_metrics)
def apply_customized_matrix_compression(
matrix_compression_obj, # pylint:disable=invalid-name
weight_params_fn,
weight_init_obj,
layer_obj,
weight_name,
weight_shape,
weight_dtype,
scope_name='pruning_interface',
spec=None):
"""Apply pruning or compression to a lingvo layer.
This provides a unified interface to perform pruning or compression for a
lingvo layer.
Args:
matrix_compression_obj: A Pruning or
compression_lib.lingvo_compression_op.ApplyCompression object;
weight_params_fn: functional handle to create model parameters;
weight_init_obj: a weight initialization object;
layer_obj: a layer object in the lingvo package, weight matrix of this
layer is pruned or compressed;
weight_name: name of the tensor that is compressed, str;
weight_shape: shape of the weight matrix;
weight_dtype: data type of the weight matrix;
scope_name: TensorFlow scope for creating relavant variables.
spec: spec to use for the compression op.
Returns:
None.
"""
if isinstance(matrix_compression_obj, pruning.Pruning):
prune_option = matrix_compression_obj.matrix_compression_spec.prune_option
with tf.variable_scope(scope_name):
# Create mask and threshold variable and add them to pruning collection.
mask_pc = weight_params_fn(weight_shape,
weight_init_obj.Constant(1.0),
weight_dtype)
threshold_pc = weight_params_fn([], weight_init_obj.Constant(0.0),
tf.float32)
layer_obj.CreateVariable('mask', mask_pc, trainable=False)
layer_obj.CreateVariable('threshold',
threshold_pc,
trainable=False)
if layer_obj.vars.mask not in tf.get_collection(
pruning.MASK_COLLECTION):
tf.add_to_collection(pruning.WEIGHT_COLLECTION,
getattr(layer_obj.vars, weight_name))
tf.add_to_collection(pruning.MASK_COLLECTION,
layer_obj.vars.mask)
tf.add_to_collection(pruning.THRESHOLD_COLLECTION,
layer_obj.vars.threshold)
if prune_option in [
'first_order_gradient', 'second_order_gradient'
]:
grad_pc = weight_params_fn(weight_shape,
weight_init_obj.Constant(0.0),
weight_dtype)
layer_obj.CreateVariable('gradient', grad_pc, trainable=False)
layer_obj.CreateVariable('old_weight',
grad_pc,
trainable=False)
layer_obj.CreateVariable('old_old_weight',
grad_pc,
trainable=False)
tf.add_to_collection(pruning.WEIGHT_GRADIENT_COLLECTION,
layer_obj.vars.gradient)
tf.add_to_collection(pruning.OLD_WEIGHT_COLLECTION,
layer_obj.vars.old_weight)
tf.add_to_collection(pruning.OLD_OLD_WEIGHT_COLLECTION,
layer_obj.vars.old_old_weight)
else:
_ = matrix_compression_obj.customized_apply_compression(
getattr(layer_obj.vars, weight_name),
layer_obj,
weight_params_fn,
weight_init_obj,
scope=scope_name,
spec=spec)
hparams = matrix_compression_obj.get_spec()
if hparams.use_collection:
tf.add_to_collection(UPDATE_OP_COLLECTION,
matrix_compression_obj.all_update_op())
def resnet_model_fn(features, labels, mode, params):
"""The model_fn for ResNet to be used with TPUEstimator.
Args:
features: `Tensor` of batched images. If transpose_input is enabled, it
is transposed to device layout and reshaped to 1D tensor.
labels: `Tensor` of labels for the data samples
mode: one of `tf.estimator.ModeKeys.{TRAIN,EVAL,PREDICT}`
params: `dict` of parameters passed to the model from the TPUEstimator,
`params['batch_size']` is always provided and should be used as the
effective batch size.
Returns:
A `TPUEstimatorSpec` for the model
"""
if isinstance(features, dict):
features = features['feature']
# In most cases, the default data format NCHW instead of NHWC should be
# used for a significant performance boost on GPU/TPU. NHWC should be used
# only if the network needs to be run on CPU since the pooling operations
# are only supported on NHWC.
if params['data_format'] == 'channels_first':
assert not params['transpose_input'] # channels_first only for GPU
features = tf.transpose(features, [0, 3, 1, 2])
if params['transpose_input'] and mode != tf.estimator.ModeKeys.PREDICT:
image_size = params['image_size']
features = tf.reshape(features, [image_size, image_size, 1, -1])
features = tf.transpose(features, [3, 0, 1, 2]) # HWCN to NHWC
# DropBlock keep_prob for the 4 block groups of ResNet architecture.
# None means applying no DropBlock at the corresponding block group.
dropblock_keep_probs = [None] * 4
if params['dropblock_groups']:
# Scheduled keep_prob for DropBlock.
train_steps = tf.cast(params['train_steps'], tf.float32)
current_step = tf.cast(tf.train.get_global_step(), tf.float32)
current_ratio = current_step / train_steps
dropblock_keep_prob = (1 - current_ratio * (
1 - params['dropblock_keep_prob']))
# Computes DropBlock keep_prob for different block groups of ResNet.
dropblock_groups = [int(x) for x in params['dropblock_groups'].split(',')]
for block_group in dropblock_groups:
if block_group < 1 or block_group > 4:
raise ValueError(
'dropblock_groups should be a comma separated list of integers '
'between 1 and 4 (dropblcok_groups: {}).'
.format(params['dropblock_groups']))
dropblock_keep_probs[block_group - 1] = 1 - (
(1 - dropblock_keep_prob) / 4.0**(4 - block_group))
# This nested function allows us to avoid duplicating the logic which
# builds the network, for different values of --precision.
def build_network():
network = resnet_model.resnet_v1(
resnet_depth=params['resnet_depth'],
num_classes=params['num_label_classes'],
dropblock_size=params['dropblock_size'],
dropblock_keep_probs=dropblock_keep_probs,
data_format=params['data_format'])
return network(
inputs=features, is_training=(mode == tf.estimator.ModeKeys.TRAIN))
# Compute the summary statistic
if params['precision'] == 'bfloat16':
with tf.tpu.bfloat16_scope():
sum_stat = build_network()
sum_stat = tf.cast(sum_stat, tf.float32)
elif params['precision'] == 'float32':
sum_stat = build_network()
if mode == tf.estimator.ModeKeys.PREDICT:
predictions = {
'summary': sum_stat,
}
return tf.estimator.EstimatorSpec(
mode=mode,
predictions=predictions,
export_outputs={
'inference': tf.estimator.export.PredictOutput(predictions)
})
n = params['num_label_classes']
# If necessary, in the model_fn, use params['batch_size'] instead the batch
# size flags (--train_batch_size or --eval_batch_size).
batch_size = params['batch_size'] # pylint: disable=unused-variable
# Add a little bit of scatter to the labels to smooth out the distribution
if (params['label_smoothing'] > 0.) and (mode == tf.estimator.ModeKeys.TRAIN):
labels += params['label_smoothing']*tf.random_normal(shape=[batch_size, n])
# Now build a conditional density estimator from this density
# Defines the chain of bijective transforms
if params['training_loss'] == 'VMIM':
net = sum_stat
# Below is the chain for a MAF
chain = [ tfp.bijectors.MaskedAutoregressiveFlow(
shift_and_log_scale_fn=masked_autoregressive_conditional_template(hidden_layers=[128,128],
conditional_tensor=net,
shift_only=False)),
tfb.Permute(np.arange(n)[::-1]),
tfp.bijectors.MaskedAutoregressiveFlow(
shift_and_log_scale_fn=masked_autoregressive_conditional_template(hidden_layers=[128,128],
conditional_tensor=net,
shift_only=False)),
tfb.Permute(np.arange(n)[::-1]),
tfp.bijectors.MaskedAutoregressiveFlow(
shift_and_log_scale_fn=masked_autoregressive_conditional_template(hidden_layers=[128,128],
conditional_tensor=net,
shift_only=True)),
tfb.Permute(np.arange(n)[::-1]),
tfp.bijectors.MaskedAutoregressiveFlow(
shift_and_log_scale_fn=masked_autoregressive_conditional_template(hidden_layers=[128,128],
conditional_tensor=net,
shift_only=True)),
]
bij = tfb.Chain(chain)
prior = tfd.MultivariateNormalDiag(loc=tf.zeros(n), scale_identity_multiplier=1.0)
distribution = tfd.TransformedDistribution(prior, bijector=bij)
# Compute loss function with some L2 regularization
loss = - tf.reduce_mean(distribution.log_prob(labels),axis=0)
elif params['training_loss'] == 'MAE':
loss = tf.reduce_mean(tf.keras.losses.mae(labels, sum_stat),axis=0)
elif params['training_loss'] == 'MSE':
loss = tf.reduce_mean(tf.keras.losses.mse(labels, sum_stat),axis=0)
else:
raise NotImplementedError
# Add weight decay to the loss for non-batch-normalization variables.
if params['enable_lars']:
loss = loss
else:
loss = loss + params['weight_decay'] * tf.add_n([
tf.nn.l2_loss(v)
for v in tf.trainable_variables()
if 'batch_normalization' not in v.name
])
host_call = None
if mode == tf.estimator.ModeKeys.TRAIN:
# Compute the current epoch and associated learning rate from global_step.
global_step = tf.train.get_global_step()
steps_per_epoch = params['num_train_images'] / params['train_batch_size']
current_epoch = (tf.cast(global_step, tf.float32) /
steps_per_epoch)
# LARS is a large batch optimizer. LARS enables higher accuracy at batch 16K
# and larger batch sizes.
if params['enable_lars']:
learning_rate = 0.0
optimizer = lars_util.init_lars_optimizer(current_epoch, params)
else:
learning_rate = learning_rate_schedule(params, current_epoch)
optimizer = tf.train.MomentumOptimizer(
learning_rate=learning_rate,
momentum=params['momentum'],
use_nesterov=True)
if params['use_tpu']:
# When using TPU, wrap the optimizer with CrossShardOptimizer which
# handles synchronization details between different TPU cores. To the
# user, this should look like regular synchronous training.
optimizer = tf.tpu.CrossShardOptimizer(optimizer)
# Batch normalization requires UPDATE_OPS to be added as a dependency to
# the train operation.
update_ops = tf.get_collection(tf.GraphKeys.UPDATE_OPS)
with tf.control_dependencies(update_ops):
train_op = optimizer.minimize(loss, global_step)
if not params['skip_host_call']:
def host_call_fn(gs, loss, lr, ce):
"""Training host call. Creates scalar summaries for training metrics.
This function is executed on the CPU and should not directly reference
any Tensors in the rest of the `model_fn`. To pass Tensors from the
model to the `metric_fn`, provide as part of the `host_call`. See
https://www.tensorflow.org/api_docs/python/tf/estimator/tpu/TPUEstimatorSpec
for more information.
Arguments should match the list of `Tensor` objects passed as the second
element in the tuple passed to `host_call`.
Args:
gs: `Tensor with shape `[batch]` for the global_step
loss: `Tensor` with shape `[batch]` for the training loss.
lr: `Tensor` with shape `[batch]` for the learning_rate.
ce: `Tensor` with shape `[batch]` for the current_epoch.
Returns:
List of summary ops to run on the CPU host.
"""
gs = gs[0]
# Host call fns are executed params['iterations_per_loop'] times after
# one TPU loop is finished, setting max_queue value to the same as
# number of iterations will make the summary writer only flush the data
# to storage once per loop.
with tf2.summary.create_file_writer(
FLAGS.model_dir,
max_queue=params['iterations_per_loop']).as_default():
with tf2.summary.record_if(True):
tf2.summary.scalar('loss', loss[0], step=gs)
tf2.summary.scalar('learning_rate', lr[0], step=gs)
tf2.summary.scalar('current_epoch', ce[0], step=gs)
return tf.summary.all_v2_summary_ops()
# To log the loss, current learning rate, and epoch for Tensorboard, the
# summary op needs to be run on the host CPU via host_call. host_call
# expects [batch_size, ...] Tensors, thus reshape to introduce a batch
# dimension. These Tensors are implicitly concatenated to
# [params['batch_size']].
gs_t = tf.reshape(global_step, [1])
loss_t = tf.reshape(loss, [1])
lr_t = tf.reshape(learning_rate, [1])
ce_t = tf.reshape(current_epoch, [1])
host_call = (host_call_fn, [gs_t, loss_t, lr_t, ce_t])
else:
train_op = None
eval_metrics = None
return tf.estimator.tpu.TPUEstimatorSpec(
mode=mode,
loss=loss,
train_op=train_op,
host_call=host_call,
eval_metrics=eval_metrics)
def __init__(self):
self.anchor_per_scale = cfg.YOLO.ANCHOR_PER_SCALE
self.classes = utils.read_class_names(cfg.YOLO.CLASSES)
self.num_classes = len(self.classes)
self.learn_rate_init = cfg.TRAIN.LEARN_RATE_INIT
self.learn_rate_end = cfg.TRAIN.LEARN_RATE_END
self.first_stage_epochs = cfg.TRAIN.FISRT_STAGE_EPOCHS
self.second_stage_epochs = cfg.TRAIN.SECOND_STAGE_EPOCHS
self.warmup_periods = cfg.TRAIN.WARMUP_EPOCHS
self.initial_weight = cfg.TRAIN.INITIAL_WEIGHT
self.time = time.strftime('%Y-%m-%d-%H-%M-%S',
time.localtime(time.time()))
self.moving_ave_decay = cfg.YOLO.MOVING_AVE_DECAY
self.max_bbox_per_scale = 150
self.train_logdir = "./data/log/train"
self.trainset = Dataset('train')
self.testset = Dataset('test')
self.steps_per_period = len(self.trainset)
self.sess = tf.Session(config=tf.ConfigProto(
allow_soft_placement=True))
with tf.name_scope('define_input'):
self.input_data = tf.placeholder(dtype=tf.float32,
name='input_data')
self.label_sbbox = tf.placeholder(dtype=tf.float32,
name='label_sbbox')
self.label_mbbox = tf.placeholder(dtype=tf.float32,
name='label_mbbox')
self.label_lbbox = tf.placeholder(dtype=tf.float32,
name='label_lbbox')
self.true_sbboxes = tf.placeholder(dtype=tf.float32,
name='sbboxes')
self.true_mbboxes = tf.placeholder(dtype=tf.float32,
name='mbboxes')
self.true_lbboxes = tf.placeholder(dtype=tf.float32,
name='lbboxes')
self.trainable = tf.placeholder(dtype=tf.bool, name='training')
with tf.name_scope("define_loss"):
self.model = YOLOV3(self.input_data, self.trainable)
self.net_var = tf.global_variables()
self.giou_loss, self.conf_loss, self.prob_loss = self.model.compute_loss(
self.label_sbbox, self.label_mbbox, self.label_lbbox,
self.true_sbboxes, self.true_mbboxes, self.true_lbboxes)
self.loss = self.giou_loss + self.conf_loss + self.prob_loss
with tf.name_scope('learn_rate'):
self.global_step = tf.Variable(1.0,
dtype=tf.float64,
trainable=False,
name='global_step')
warmup_steps = tf.constant(self.warmup_periods *
self.steps_per_period,
dtype=tf.float64,
name='warmup_steps')
train_steps = tf.constant(
(self.first_stage_epochs + self.second_stage_epochs) *
self.steps_per_period,
dtype=tf.float64,
name='train_steps')
self.learn_rate = tf.cond(
pred=self.global_step < warmup_steps,
true_fn=lambda: self.global_step / warmup_steps * self.
learn_rate_init,
false_fn=lambda: self.learn_rate_end + 0.5 *
(self.learn_rate_init - self.learn_rate_end) * (1 + tf.cos(
(self.global_step - warmup_steps) /
(train_steps - warmup_steps) * np.pi)))
global_step_update = tf.assign_add(self.global_step, 1.0)
with tf.name_scope("define_weight_decay"):
moving_ave = tf.train.ExponentialMovingAverage(
self.moving_ave_decay).apply(tf.trainable_variables())
with tf.name_scope("define_first_stage_train"):
self.first_stage_trainable_var_list = []
for var in tf.trainable_variables():
var_name = var.op.name
var_name_mess = str(var_name).split('/')
if var_name_mess[0] in [
'conv_sbbox', 'conv_mbbox', 'conv_lbbox'
]:
self.first_stage_trainable_var_list.append(var)
first_stage_optimizer = tf.train.AdamOptimizer(
self.learn_rate).minimize(
self.loss, var_list=self.first_stage_trainable_var_list)
with tf.control_dependencies(
tf.get_collection(tf.GraphKeys.UPDATE_OPS)):
with tf.control_dependencies(
[first_stage_optimizer, global_step_update]):
with tf.control_dependencies([moving_ave]):
self.train_op_with_frozen_variables = tf.no_op()
with tf.name_scope("define_second_stage_train"):
second_stage_trainable_var_list = tf.trainable_variables()
second_stage_optimizer = tf.train.AdamOptimizer(
self.learn_rate).minimize(
self.loss, var_list=second_stage_trainable_var_list)
with tf.control_dependencies(
tf.get_collection(tf.GraphKeys.UPDATE_OPS)):
with tf.control_dependencies(
[second_stage_optimizer, global_step_update]):
with tf.control_dependencies([moving_ave]):
self.train_op_with_all_variables = tf.no_op()
with tf.name_scope('loader_and_saver'):
self.loader = tf.train.Saver(self.net_var)
self.saver = tf.train.Saver(tf.global_variables(), max_to_keep=10)
with tf.name_scope('summary'):
tf.summary.scalar("learn_rate", self.learn_rate)
tf.summary.scalar("giou_loss", self.giou_loss)
tf.summary.scalar("conf_loss", self.conf_loss)
tf.summary.scalar("prob_loss", self.prob_loss)
tf.summary.scalar("total_loss", self.loss)
logdir = "./data/log/"
if os.path.exists(logdir): shutil.rmtree(logdir)
os.mkdir(logdir)
self.write_op = tf.summary.merge_all()
self.summary_writer = tf.summary.FileWriter(logdir,
graph=self.sess.graph)
def model_fn(features, labels, mode, params=None): #//@follow-up Estmator Evaluation (7)
"""Build model and optimizer."""
is_training = mode == tf.estimator.ModeKeys.TRAIN
# Check training mode.
if FLAGS.train_mode == 'pretrain':
num_transforms = 2
if FLAGS.fine_tune_after_block > -1:
raise ValueError('Does not support layer freezing during pretraining,'
'should set fine_tune_after_block<=-1 for safety.')
elif FLAGS.train_mode == 'finetune': #//@follow-up Estmator Evaluation (8)
num_transforms = 1
#boostx add predict
elif FLAGS.train_mode == 'predict': #//@audit predict
predictions,endpoints = model(features["image"], tf.estimator.ModeKeys.TRAIN)
_,top_5 = tf.nn.top_k(predictions,k=5)
predictions = {
'top_1': tf.argmax(predictions, -1),
'top_5': top_5,
'probabilities': tf.nn.softmax(predictions),
'logits': predictions,
}
return tf.estimator.EstimatorSpec(mode, predictions=predictions)
#boostx:end
else:
raise ValueError('Unknown train_mode {}'.format(FLAGS.train_mode))
# Split channels, and optionally apply extra batched augmentation. #//@follow-up Estmator Evaluation (9)
features_list = tf.split(
features, num_or_size_splits=num_transforms, axis=-1)
if FLAGS.use_blur and is_training and FLAGS.train_mode == 'pretrain':
features_list = data_util.batch_random_blur(
features_list, FLAGS.image_size, FLAGS.image_size)
features = tf.concat(features_list, 0) # (num_transforms * bsz, h, w, c)
# Base network forward pass.
with tf.variable_scope('base_model'):
if FLAGS.train_mode == 'finetune' and FLAGS.fine_tune_after_block >= 4:
# Finetune just supervised (linear) head will not update BN stats.
model_train_mode = False
else:
# Pretrain or finetuen anything else will update BN stats.
model_train_mode = is_training
hiddens = model(features, is_training=model_train_mode)
# Add head and loss.
if FLAGS.train_mode == 'pretrain':
tpu_context = params['context'] if 'context' in params else None
hiddens_proj = model_util.projection_head(hiddens, is_training)
contrast_loss, logits_con, labels_con = obj_lib.add_contrastive_loss(
hiddens_proj,
hidden_norm=FLAGS.hidden_norm,
temperature=FLAGS.temperature,
tpu_context=tpu_context if is_training else None)
logits_sup = tf.zeros([params['batch_size'], num_classes])
else:
contrast_loss = tf.zeros([])
logits_con = tf.zeros([params['batch_size'], 10])
labels_con = tf.zeros([params['batch_size'], 10])
logits_sup = model_util.supervised_head(
hiddens, num_classes, is_training)
obj_lib.add_supervised_loss(
labels=labels['labels'],
logits=logits_sup,
weights=labels['mask'])
# Add weight decay to loss, for non-LARS optimizers.
model_util.add_weight_decay(adjust_per_optimizer=True)
loss = tf.losses.get_total_loss()
if FLAGS.train_mode == 'pretrain':
variables_to_train = tf.trainable_variables()
else:
collection_prefix = 'trainable_variables_inblock_'
variables_to_train = []
for j in range(FLAGS.fine_tune_after_block + 1, 6):
variables_to_train += tf.get_collection(collection_prefix + str(j))
assert variables_to_train, 'variables_to_train shouldn\'t be empty!'
tf.logging.info('===============Variables to train (begin)===============')
tf.logging.info(variables_to_train)
tf.logging.info('================Variables to train (end)================')
learning_rate = model_util.learning_rate_schedule(
FLAGS.learning_rate, num_train_examples)
if is_training:
if FLAGS.train_summary_steps > 0:
# Compute stats for the summary.
prob_con = tf.nn.softmax(logits_con)
entropy_con = - tf.reduce_mean(
tf.reduce_sum(prob_con * tf.math.log(prob_con + 1e-8), -1))
summary_writer = tf2.summary.create_file_writer(FLAGS.model_dir)
# TODO(iamtingchen): remove this control_dependencies in the future.
with tf.control_dependencies([summary_writer.init()]):
with summary_writer.as_default():
should_record = tf.math.equal(
tf.math.floormod(tf.train.get_global_step(),
FLAGS.train_summary_steps), 0)
with tf2.summary.record_if(should_record):
contrast_acc = tf.equal(
tf.argmax(labels_con, 1), tf.argmax(logits_con, axis=1))
contrast_acc = tf.reduce_mean(tf.cast(contrast_acc, tf.float32))
label_acc = tf.equal(
tf.argmax(labels['labels'], 1), tf.argmax(logits_sup, axis=1))
label_acc = tf.reduce_mean(tf.cast(label_acc, tf.float32))
tf2.summary.scalar(
'train_contrast_loss',
contrast_loss,
step=tf.train.get_global_step())
tf2.summary.scalar(
'train_contrast_acc',
contrast_acc,
step=tf.train.get_global_step())
tf2.summary.scalar(
'train_label_accuracy',
label_acc,
step=tf.train.get_global_step())
tf2.summary.scalar(
'contrast_entropy',
entropy_con,
step=tf.train.get_global_step())
tf2.summary.scalar(
'learning_rate', learning_rate,
step=tf.train.get_global_step())
tf2.summary.scalar(
'input_mean',
tf.reduce_mean(features),
step=tf.train.get_global_step())
tf2.summary.scalar(
'input_max',
tf.reduce_max(features),
step=tf.train.get_global_step())
tf2.summary.scalar(
'input_min',
tf.reduce_min(features),
step=tf.train.get_global_step())
tf2.summary.scalar(
'num_labels',
tf.reduce_mean(tf.reduce_sum(labels['labels'], -1)),
step=tf.train.get_global_step())
if FLAGS.optimizer == 'momentum':
optimizer = tf.train.MomentumOptimizer(
learning_rate, FLAGS.momentum, use_nesterov=True)
elif FLAGS.optimizer == 'adam':
optimizer = tf.train.AdamOptimizer(
learning_rate)
elif FLAGS.optimizer == 'lars':
optimizer = LARSOptimizer(
learning_rate,
momentum=FLAGS.momentum,
weight_decay=FLAGS.weight_decay,
exclude_from_weight_decay=['batch_normalization', 'bias'])
else:
raise ValueError('Unknown optimizer {}'.format(FLAGS.optimizer))
if FLAGS.use_tpu:
optimizer = tf.tpu.CrossShardOptimizer(optimizer)
control_deps = tf.get_collection(tf.GraphKeys.UPDATE_OPS)
if FLAGS.train_summary_steps > 0:
control_deps.extend(tf.summary.all_v2_summary_ops())
with tf.control_dependencies(control_deps):
train_op = optimizer.minimize(
loss, global_step=tf.train.get_or_create_global_step(),
var_list=variables_to_train)
if FLAGS.checkpoint:
def scaffold_fn():
"""Scaffold function to restore non-logits vars from checkpoint."""
tf.train.init_from_checkpoint(
FLAGS.checkpoint,
{v.op.name: v.op.name
for v in tf.global_variables(FLAGS.variable_schema)})
if FLAGS.zero_init_logits_layer:
# Init op that initializes output layer parameters to zeros.
output_layer_parameters = [
var for var in tf.trainable_variables() if var.name.startswith(
'head_supervised')]
tf.logging.info('Initializing output layer parameters %s to zero',
[x.op.name for x in output_layer_parameters])
with tf.control_dependencies([tf.global_variables_initializer()]):
init_op = tf.group([
tf.assign(x, tf.zeros_like(x))
for x in output_layer_parameters])
return tf.train.Scaffold(init_op=init_op)
else:
return tf.train.Scaffold()
else:
scaffold_fn = None
return tf.estimator.tpu.TPUEstimatorSpec(
mode=mode, train_op=train_op, loss=loss, scaffold_fn=scaffold_fn)
else:
def metric_fn(logits_sup, labels_sup, logits_con, labels_con, mask,
**kws): #//@follow-up metric_fn (0)
"""Inner metric function."""
metrics = {k: tf.metrics.mean(v, weights=mask)
for k, v in kws.items()}
metrics['label_top_1_accuracy'] = tf.metrics.accuracy(
tf.argmax(labels_sup, 1), tf.argmax(logits_sup, axis=1),
weights=mask)
metrics['label_top_5_accuracy'] = tf.metrics.recall_at_k(
tf.argmax(labels_sup, 1), logits_sup, k=5, weights=mask)
metrics['contrastive_top_1_accuracy'] = tf.metrics.accuracy(
tf.argmax(labels_con, 1), tf.argmax(logits_con, axis=1),
weights=mask)
metrics['contrastive_top_5_accuracy'] = tf.metrics.recall_at_k(
tf.argmax(labels_con, 1), logits_con, k=5, weights=mask)
#//@audit save the predicted (label, logit) to logfile
#import sys
#tf.logging.info(labels_sup)
#tf.print(labels_sup,output_stream=sys.stdout)
metrics['boostx_recall'] = tf.metrics.recall(
tf.argmax(labels_sup, 1), tf.argmax(logits_sup, axis=1), weights=mask)
return metrics
metrics = {
'logits_sup': logits_sup,
'labels_sup': labels['labels'],
'logits_con': logits_con,
'labels_con': labels_con,
'mask': labels['mask'],
'contrast_loss': tf.fill((params['batch_size'],), contrast_loss),
'regularization_loss': tf.fill((params['batch_size'],),
tf.losses.get_regularization_loss()),
}
return tf.estimator.tpu.TPUEstimatorSpec(
mode=mode,
loss=loss,
eval_metrics=(metric_fn, metrics), #//@follow-up metric_fn (-1)
scaffold_fn=None)
def get_customized_apply_compression_op(self,
a_matrix_tfvar,
matrix_compressor,
layer_obj,
weight_params_fn,
weight_init_obj,
scope='default_scope'):
"""Returns pruning + kmeans compressed operator for a customized layer.
Args:
a_matrix_tfvar: TF variable representing a tensor variable in a model.
matrix_compressor: MatrixCompressorInferface object to specify the
compression algorithm. Must return two matrices b_matrix,c_matrix in its
compression.
layer_obj: a customeried layer object that handles variable creation.
weight_params_fn: functional handle to create model parameters.
weight_init_obj: a weight initialization object.
scope: TF scope used for creating new TF variables.
Returns:
A TF node that has the compressed version of a_matrix_tfvar.
"""
self.matrix_compressor = matrix_compressor
a_matrix = np.zeros(shape=a_matrix_tfvar.shape)
if getattr(self._spec, 'do_transpose', False):
a_matrix = np.transpose(a_matrix)
[b_matrix, c_matrix] = matrix_compressor.static_matrix_compressor(a_matrix)
self.uncompressed_size = matrix_compressor.uncompressed_size
self.compressed_size = matrix_compressor.compressed_size
p = layer_obj.params
with tf.variable_scope(scope) as scope:
# Create pruning relevant variables.
mask_pc = weight_params_fn(a_matrix.shape, weight_init_obj.Constant(1.0),
p.dtype)
threshold_pc = weight_params_fn([], weight_init_obj.Constant(0.0),
tf.float32)
self._create_layer_variable(layer_obj, 'mask', mask_pc, None, False)
self._create_layer_variable(layer_obj, 'threshold', threshold_pc, None,
False)
if layer_obj.vars.mask not in tf.get_collection(pruning.MASK_COLLECTION):
tf.add_to_collection(pruning.WEIGHT_COLLECTION, layer_obj.vars.wm)
tf.add_to_collection(pruning.MASK_COLLECTION, layer_obj.vars.mask)
tf.add_to_collection(pruning.THRESHOLD_COLLECTION,
layer_obj.vars.threshold)
if self.pruning_obj.get_spec().prune_option in [
'first_order_gradient', 'second_order_gradient'
]:
grad_pc = weight_params_fn(a_matrix.shape,
weight_init_obj.Constant(0.0), p.dtype)
self._create_layer_variable(layer_obj, 'gradient', grad_pc, None, False)
self._create_layer_variable(layer_obj, 'old_weight', grad_pc, None,
False)
self._create_layer_variable(layer_obj, 'old_old_weight', grad_pc, None,
False)
tf.add_to_collection(pruning.WEIGHT_GRADIENT_COLLECTION,
layer_obj.vars.gradient)
tf.add_to_collection(pruning.OLD_WEIGHT_COLLECTION,
layer_obj.vars.old_weight)
tf.add_to_collection(pruning.OLD_OLD_WEIGHT_COLLECTION,
layer_obj.vars.old_old_weight)
b_matrix_pc = weight_params_fn(b_matrix.shape,
weight_init_obj.Constant(1.0), p.dtype)
c_matrix_pc = weight_params_fn(c_matrix.shape,
weight_init_obj.Constant(1), tf.int32)
alpha_pc = weight_params_fn([], weight_init_obj.Constant(1.0), tf.float32)
self._create_layer_variable(layer_obj, 'alpha', alpha_pc, None, False)
self._create_layer_variable(
layer_obj,
'b_matrix_tfvar',
b_matrix_pc,
None,
trainable=self.matrix_compressor.get_spec().is_b_matrix_trainable)
self._create_layer_variable(
layer_obj,
'c_matrix_tfvar',
c_matrix_pc,
None,
trainable=self.matrix_compressor.get_spec().is_c_matrix_trainable)
self.b_matrix_tfvar = layer_obj.vars.b_matrix_tfvar
self.c_matrix_tfvar = layer_obj.vars.c_matrix_tfvar
self.alpha = layer_obj.vars.alpha
self.a_matrix_tfvar = a_matrix_tfvar
self.mask = layer_obj.vars.mask
self.threshold = layer_obj.vars.threshold
self.pruned_a_matrix_tfvar = tf.multiply(layer_obj.vars.wm,
layer_obj.vars.mask,
'masked_weight')
def maybe_apply_compression():
"""Decide whether global step is within compression range.
Returns:
is_step_within_compression_range: bool.
"""
with tf.compat.v1.name_scope(self._spec.name):
# Compress if current step is more than begin_compression_step and
# less than end_compression_step (unless it's negative)
global_step = tf.train.get_global_step()
def real_global_step_fn():
return tf.cast(tf.train.get_global_step(), tf.int32)
def mock_global_step_fn():
return self._spec.begin_compression_step
def is_global_step_none(global_step):
return tf.constant(global_step is None, dtype=tf.bool)
global_step = tf.cond(is_global_step_none(global_step),
mock_global_step_fn,
real_global_step_fn)
is_step_within_compression_range = tf.logical_and(
tf.greater_equal(
tf.cast(global_step, tf.int32),
self._spec.begin_compression_step),
tf.logical_or(
tf.less_equal(
tf.cast(global_step, tf.int32),
self._spec.end_compression_step),
tf.less(self._spec.end_compression_step, 0)))
return is_step_within_compression_range
if getattr(self._spec, 'do_transpose', False):
self.pruning_and_compression_op = (
self.alpha * self.pruned_a_matrix_tfvar +
(1 - self.alpha) * tf.math.multiply(
tf.transpose(
tf.reshape(
tf.nn.embedding_lookup(self.b_matrix_tfvar,
self.c_matrix_tfvar),
tf.transpose(a_matrix_tfvar).shape)),
self.mask,
name='pruned_compressed_weight'))
else:
self.pruning_and_compression_op = (
self.alpha * self.pruned_a_matrix_tfvar +
(1 - self.alpha) * tf.math.multiply(
tf.reshape(
tf.nn.embedding_lookup(self.b_matrix_tfvar,
self.c_matrix_tfvar),
a_matrix_tfvar.shape),
self.mask,
name='pruned_compressed_weight'))
def pruned_a_matrix_fn():
return self.pruned_a_matrix_tfvar
def quantized_pruned_a_matrix_fn():
return self.pruning_and_compression_op
self.final_op = tf.cond(maybe_apply_compression(),
quantized_pruned_a_matrix_fn, pruned_a_matrix_fn)
self.add_compression_summaries()
self.pruning_obj.add_pruning_summaries()
self.update_op = tf.no_op()
return [self.final_op, self.update_op]
def get_layer_variables_by_scope(scope_name):
ret = []
for v in tf.get_collection(tf.GraphKeys.MODEL_VARIABLES):
if scope_name + '/' in v.name:
ret.append(v)
return ret
def __init__(self,
sess,
env,
handle,
name,
update_every=5,
use_mf=False,
learning_rate=1e-4,
tau=0.005,
gamma=0.95):
# assert isinstance(env, GridWorld)
self.env = env
self.name = name
self._saver = None
self.sess = sess
self.handle = handle
self.view_space = env.get_view_space(handle)
assert len(self.view_space) == 3
self.feature_space = env.get_feature_space(handle)
self.num_actions = env.get_action_space(handle)[0]
self.update_every = update_every
self.use_mf = use_mf # trigger of using mean field
self.temperature = 0.1
self.lr = learning_rate
self.tau = tau
self.gamma = gamma
with tf.variable_scope(name or "ValueNet"):
self.name_scope = tf.get_variable_scope().name
self.obs_input = tf.placeholder(tf.float32,
(None, ) + self.view_space,
name="Obs-Input")
self.feat_input = tf.placeholder(tf.float32,
(None, ) + self.feature_space,
name="Feat-Input")
self.mask = tf.placeholder(tf.float32,
shape=(None, ),
name='Terminate-Mask')
if self.use_mf:
self.act_prob_input0 = tf.placeholder(tf.float32,
(None, self.num_actions),
name="Act-Prob-Input0")
self.act_prob_input1 = tf.placeholder(tf.float32,
(None, self.num_actions),
name="Act-Prob-Input1")
self.act_prob_input2 = tf.placeholder(tf.float32,
(None, self.num_actions),
name="Act-Prob-Input2")
self.act_prob_input3 = tf.placeholder(tf.float32,
(None, self.num_actions),
name="Act-Prob-Input3")
self.act_input = tf.placeholder(tf.int32, (None, ), name="Act")
self.act_one_hot = tf.one_hot(self.act_input,
depth=self.num_actions,
on_value=1.0,
off_value=0.0)
with tf.variable_scope("Eval-Net"):
self.eval_name = tf.get_variable_scope().name
self.e_q = self._construct_net(active_func=tf.nn.relu)
self.predict = tf.nn.softmax(self.e_q / self.temperature)
self.e_variables = tf.get_collection(
tf.GraphKeys.GLOBAL_VARIABLES, scope=self.eval_name)
with tf.variable_scope("Target-Net"):
self.target_name = tf.get_variable_scope().name
self.t_q = self._construct_net(active_func=tf.nn.relu)
self.t_variables = tf.get_collection(
tf.GraphKeys.GLOBAL_VARIABLES, scope=self.target_name)
with tf.variable_scope("Update"):
self.update_op = [
tf.assign(
self.t_variables[i], self.tau * self.e_variables[i] +
(1. - self.tau) * self.t_variables[i])
for i in range(len(self.t_variables))
]
with tf.variable_scope("Optimization"):
self.target_q_input = tf.placeholder(tf.float32, (None, ),
name="Q-Input")
self.e_q_max = tf.reduce_sum(tf.multiply(
self.act_one_hot, self.e_q),
axis=1)
self.loss = tf.reduce_sum(
tf.square(self.target_q_input - self.e_q_max) *
self.mask) / tf.reduce_sum(self.mask)
self.train_op = tf.train.AdamOptimizer(self.lr).minimize(
self.loss)
def main(unused_argv):
tf.logging.set_verbosity(FLAGS.log)
if FLAGS.checkpoint_path:
checkpoint_path = FLAGS.checkpoint_path
else:
expdir = FLAGS.expdir
tf.logging.info("Will load latest checkpoint from %s.", expdir)
while not tf.gfile.Exists(expdir):
tf.logging.fatal("\tExperiment save dir '%s' does not exist!",
expdir)
sys.exit(1)
try:
checkpoint_path = tf.train.latest_checkpoint(expdir)
except tf.errors.NotFoundError:
tf.logging.fatal(
"There was a problem determining the latest checkpoint.")
sys.exit(1)
if not tf.train.checkpoint_exists(checkpoint_path):
tf.logging.fatal("Invalid checkpoint path: %s", checkpoint_path)
sys.exit(1)
savedir = FLAGS.savedir
if not tf.gfile.Exists(savedir):
tf.gfile.MakeDirs(savedir)
# Make the graph
with tf.Graph().as_default():
with tf.Session(config=tf.ConfigProto(
allow_soft_placement=True)) as sess:
model = utils.get_module("baseline.models.%s" % FLAGS.model)
hparams = model.get_hparams(FLAGS.config)
# Load the trained model with is_training=False
with tf.name_scope("Reader"):
batch = reader.NSynthDataset(
FLAGS.tfrecord_path,
is_training=False).get_baseline_batch(hparams)
_ = model.train_op(batch, hparams, FLAGS.config)
z = tf.get_collection("z")[0]
init_op = tf.group(tf.global_variables_initializer(),
tf.local_variables_initializer())
sess.run(init_op)
# Add ops to save and restore all the variables.
# Restore variables from disk.
saver = tf.train.Saver()
saver.restore(sess, checkpoint_path)
tf.logging.info("Model restored.")
# Start up some threads
coord = tf.train.Coordinator()
threads = tf.train.start_queue_runners(sess=sess, coord=coord)
i = 0
z_val = []
try:
while True:
if coord.should_stop():
break
res_val = sess.run([z])
z_val.append(res_val[0])
tf.logging.info("Iter: %d" % i)
tf.logging.info("Z:{}".format(res_val[0].shape))
i += 1
if i + 1 % 1 == 0:
save_arrays(savedir, hparams, z_val)
# Report all exceptions to the coordinator, pylint: disable=broad-except
except Exception as e:
coord.request_stop(e)
# pylint: enable=broad-except
finally:
save_arrays(savedir, hparams, z_val)
# Terminate as usual. It is innocuous to request stop twice.
coord.request_stop()
coord.join(threads)
def create_optimizer(loss, init_lr, num_train_steps, num_warmup_steps, use_tpu,
exclude_bert):
"""Creates an optimizer training op, optionally excluding BERT vars."""
global_step = tf.train.get_or_create_global_step()
learning_rate = tf.constant(value=init_lr, shape=[], dtype=tf.float32)
# Implements linear decay of the learning rate.
learning_rate = tf.train.polynomial_decay(
learning_rate,
global_step,
num_train_steps,
end_learning_rate=0.0,
power=1.0,
cycle=False)
# Implements linear warmup. I.e., if global_step < num_warmup_steps, the
# learning rate will be `global_step/num_warmup_steps * init_lr`.
if num_warmup_steps:
global_steps_int = tf.cast(global_step, tf.int32)
warmup_steps_int = tf.constant(num_warmup_steps, dtype=tf.int32)
global_steps_float = tf.cast(global_steps_int, tf.float32)
warmup_steps_float = tf.cast(warmup_steps_int, tf.float32)
warmup_percent_done = global_steps_float / warmup_steps_float
warmup_learning_rate = init_lr * warmup_percent_done
is_warmup = tf.cast(global_steps_int < warmup_steps_int, tf.float32)
learning_rate = ((1.0 - is_warmup) * learning_rate +
is_warmup * warmup_learning_rate)
# It is recommended that you use this optimizer for fine tuning, since this
# is how the model was trained (note that the Adam m/v variables are NOT
# loaded from init_checkpoint.)
optimizer = optimization.AdamWeightDecayOptimizer(
learning_rate=learning_rate,
weight_decay_rate=0.01,
beta_1=0.9,
beta_2=0.999,
epsilon=1e-6,
exclude_from_weight_decay=["LayerNorm", "layer_norm", "bias"])
if use_tpu:
optimizer = tf_estimator.tpu.CrossShardOptimizer(optimizer)
tvars = tf.trainable_variables()
if exclude_bert:
bert_vars = tf.get_collection(tf.GraphKeys.TRAINABLE_VARIABLES, "bert")
tvars = [vv for vv in tvars if vv not in bert_vars]
tf.logging.info("Training the following variables:")
for vv in tvars:
tf.logging.info(vv.name)
grads = tf.gradients(loss, tvars, colocate_gradients_with_ops=True)
# This is how the model was pre-trained.
(grads, _) = tf.clip_by_global_norm(grads, clip_norm=1.0)
train_op = optimizer.apply_gradients(
zip(grads, tvars), global_step=global_step)
new_global_step = global_step + 1
train_op = tf.group(train_op, [global_step.assign(new_global_step)])
return train_op
def find_trainable_variables(key):
return tf.get_collection(tf.GraphKeys.TRAINABLE_VARIABLES,
".*{}.*".format(key))
def main():
if FLAGS.datasource == 'sinusoid':
if FLAGS.train:
test_num_updates = 1
else:
test_num_updates = 10
else:
if FLAGS.datasource == 'miniimagenet':
if FLAGS.train:
test_num_updates = 1 # eval on at least one update during training
else:
test_num_updates = 10
else:
test_num_updates = 10
if not FLAGS.train:
orig_meta_batch_size = FLAGS.meta_batch_size
# always use meta batch size of 1 when testing.
FLAGS.meta_batch_size = 1
if FLAGS.datasource == 'sinusoid':
data_generator = DataGenerator(FLAGS.update_batch_size * 2,
FLAGS.meta_batch_size)
else:
if FLAGS.metatrain_iterations == 0 and FLAGS.datasource == 'miniimagenet':
assert FLAGS.meta_batch_size == 1
assert FLAGS.update_batch_size == 1
data_generator = DataGenerator(
1, FLAGS.meta_batch_size) # only use one datapoint,
else:
if FLAGS.datasource == 'miniimagenet': # TODO - use 15 val examples for imagenet?
if FLAGS.train:
data_generator = DataGenerator(
FLAGS.update_batch_size + 15, FLAGS.meta_batch_size
) # only use one datapoint for testing to save memory
else:
data_generator = DataGenerator(
FLAGS.update_batch_size * 2, FLAGS.meta_batch_size
) # only use one datapoint for testing to save memory
else:
data_generator = DataGenerator(
FLAGS.update_batch_size * 2, FLAGS.meta_batch_size
) # only use one datapoint for testing to save memory
dim_output = data_generator.dim_output
if FLAGS.baseline == 'oracle':
assert FLAGS.datasource == 'sinusoid'
dim_input = 3
FLAGS.pretrain_iterations += FLAGS.metatrain_iterations
FLAGS.metatrain_iterations = 0
else:
dim_input = data_generator.dim_input
if FLAGS.datasource == 'miniimagenet' or FLAGS.datasource == 'omniglot':
tf_data_load = True
num_classes = data_generator.num_classes
if FLAGS.train: # only construct training model if needed
random.seed(5)
image_tensor, label_tensor = data_generator.make_data_tensor()
inputa = tf.slice(image_tensor, [0, 0, 0],
[-1, num_classes * FLAGS.update_batch_size, -1])
inputb = tf.slice(image_tensor,
[0, num_classes * FLAGS.update_batch_size, 0],
[-1, -1, -1])
labela = tf.slice(label_tensor, [0, 0, 0],
[-1, num_classes * FLAGS.update_batch_size, -1])
labelb = tf.slice(label_tensor,
[0, num_classes * FLAGS.update_batch_size, 0],
[-1, -1, -1])
input_tensors = {
'inputa': inputa,
'inputb': inputb,
'labela': labela,
'labelb': labelb
}
print("inputa shape", inputa.shape)
random.seed(6)
image_tensor, label_tensor = data_generator.make_data_tensor(
train=False)
inputa = tf.slice(image_tensor, [0, 0, 0],
[-1, num_classes * FLAGS.update_batch_size, -1])
inputb = tf.slice(image_tensor,
[0, num_classes * FLAGS.update_batch_size, 0],
[-1, -1, -1])
labela = tf.slice(label_tensor, [0, 0, 0],
[-1, num_classes * FLAGS.update_batch_size, -1])
labelb = tf.slice(label_tensor,
[0, num_classes * FLAGS.update_batch_size, 0],
[-1, -1, -1])
metaval_input_tensors = {
'inputa': inputa,
'inputb': inputb,
'labela': labela,
'labelb': labelb
}
else:
tf_data_load = False
input_tensors = None
model = MAML(dim_input, dim_output, test_num_updates=test_num_updates)
if FLAGS.train or not tf_data_load:
model.construct_model(input_tensors=input_tensors, prefix='metatrain_')
if tf_data_load:
model.construct_model(input_tensors=metaval_input_tensors,
prefix='metaval_')
model.summ_op = tf.summary.merge_all()
saver = loader = tf.train.Saver(tf.get_collection(
tf.GraphKeys.TRAINABLE_VARIABLES),
max_to_keep=10)
sess = tf.InteractiveSession()
if not FLAGS.train:
# change to original meta batch size when loading model.
FLAGS.meta_batch_size = orig_meta_batch_size
if FLAGS.train_update_batch_size == -1:
FLAGS.train_update_batch_size = FLAGS.update_batch_size
if FLAGS.train_update_lr == -1:
FLAGS.train_update_lr = FLAGS.update_lr
exp_string = 'cls_' + str(FLAGS.num_classes) + '.mbs_' + str(
FLAGS.meta_batch_size) + '.ubs_' + str(
FLAGS.train_update_batch_size) + '.numstep' + str(
FLAGS.num_updates) + '.updatelr' + str(FLAGS.train_update_lr)
if FLAGS.num_filters != 64:
exp_string += 'hidden' + str(FLAGS.num_filters)
if FLAGS.max_pool:
exp_string += 'maxpool'
if FLAGS.stop_grad:
exp_string += 'stopgrad'
if FLAGS.baseline:
exp_string += FLAGS.baseline
if FLAGS.norm == 'batch_norm':
exp_string += 'batchnorm'
elif FLAGS.norm == 'layer_norm':
exp_string += 'layernorm'
elif FLAGS.norm == 'None':
exp_string += 'nonorm'
else:
print('Norm setting not recognized.')
resume_itr = 0
model_file = None
tf.global_variables_initializer().run()
tf.train.start_queue_runners()
if not FLAGS.rand_init:
if FLAGS.resume or not FLAGS.train:
model_file = tf.train.latest_checkpoint(FLAGS.logdir + '/' +
exp_string)
if FLAGS.test_iter > 0:
model_file = model_file[:model_file.index('model'
)] + 'model' + str(
FLAGS.test_iter)
if model_file:
ind1 = model_file.index('model')
resume_itr = int(model_file[ind1 + 5:])
print("Restoring model weights from " + model_file)
saver.restore(sess, model_file)
if FLAGS.train:
train(model, saver, sess, exp_string, data_generator, resume_itr)
else:
test(model, saver, sess, exp_string, data_generator, test_num_updates)
def train_graph(self, train_dict):
"""
PURPOSE: Train a deep neural net classifier for baskets of products
ARGS:
train_dict (dict) dictionary with ALL the following key values
embeddings (list(list)) trained product embedding layers
sequences_train (list(list)) training order product numbers
labels_train (list) training order class labels
sequences_valid (list(list)) test order product numbers
labels_valid (list) test order class
batch_size (int) number of training example per mini batch
n_stop (int) early stopping criteria
"""
embeddings = train_dict.get('embeddings', None)
sequences_train = train_dict.get('sequences_train', None)
labels_train = train_dict.get('labels_train', None)
sequences_valid = train_dict.get('sequences_valid', None)
labels_valid = train_dict.get('labels_valid', None)
batch_size = train_dict.get('batch_size', 100)
n_stop = train_dict.get('n_stop', 5)
n_train_ex = len(sequences_train)
n_batches = n_train_ex // batch_size
done, epoch, acc_reg = 0, 0, [0, 1]
with self.graph.as_default():
correct_, accuracy_ = tf.get_collection('Eval_ops')
acc_summary = tf.summary.scalar('Accuracy', accuracy_)
file_writer = tf.summary.FileWriter(self.log_dir, self.graph)
with tf.Session(graph=self.graph) as sess:
init_, saver_ = tf.get_collection('Init_Save_ops')
correct_, accuracy_ = tf.get_collection('Eval_ops')
optimizer_, training_op_ = tf.get_collection("Optimizer_ops")
sequences_, W_embed_, Y_, training_ = tf.get_collection(
"Input_var")
sess.run(init_)
while done != 1:
epoch += 1
batches = self._partition_(list(range(n_train_ex)), n_batches)
#Mini-Batch Training step
for iteration in ProgressBar(
range(n_batches), 'Epoch {} Iterations'.format(epoch)):
sequences_batch = [
sequences_train[indx] for indx in batches[iteration]
]
labels_batch = [
labels_train[indx] for indx in batches[iteration]
]
sess.run(
[training_op_],
feed_dict={
training_: True,
W_embed_: embeddings,
sequences_: sequences_batch,
Y_: labels_batch
})
#Intermediate Summary Writing
if iteration % 10 == 0:
summary_str = acc_summary.eval(
feed_dict={
training_: False,
W_embed_: embeddings,
sequences_: sequences_valid,
Y_: labels_valid
})
step = epoch * n_batches + iteration
file_writer.add_summary(summary_str, step)
#Early Stopping Regularization
if epoch % 1 == 0:
# Evaluating the Accuracy of Current Model
acc_ckpt = accuracy_.eval(
feed_dict={
training_: False,
W_embed_: embeddings,
sequences_: sequences_valid,
Y_: labels_valid
})
if acc_ckpt > acc_reg[0]:
# Saving the new "best" model
save_path = saver_.save(sess, self.temp_ckpt)
acc_reg = [acc_ckpt, 1]
elif acc_ckpt <= acc_reg[0] and acc_reg[1] < n_stop:
acc_reg[1] += 1
elif acc_ckpt <= acc_reg[0] and acc_reg[1] >= n_stop:
#Restoring previous "best" model
saver_.restore(sess, self.temp_ckpt)
done = 1
#Calculating Accuracy for Output
acc_train = accuracy_.eval(
feed_dict={
training_: False,
W_embed_: embeddings,
sequences_: sequences_train,
Y_: labels_train
})
acc_test = accuracy_.eval(
feed_dict={
training_: False,
W_embed_: embeddings,
sequences_: sequences_valid,
Y_: labels_valid
})
print(
'Register:{} Epoch:{:2d} Train Accuracy:{:6.4f} Validation Accuracy: {:6.4f}'
.format(acc_reg, epoch, acc_train, acc_test))
#Final Model Save
save_path = saver_.save(sess, self.final_ckpt)
def model_fn(features, labels, mode, params):
"""Returns the model function."""
feature = features['feature']
print(feature)
labels = labels['label']
one_hot_labels = model_utils.get_label(
labels,
params,
FLAGS.src_num_classes,
batch_size=FLAGS.train_batch_size)
def get_logits():
"""Return the logits."""
avg_pool = model.conv_model(feature, mode)
name = 'final_dense_dst'
with tf.variable_scope('target_CLS'):
logits = tf.layers.dense(inputs=avg_pool,
units=FLAGS.src_num_classes,
name=name)
return logits
logits = get_logits()
logits = tf.cast(logits, tf.float32)
dst_loss = tf.losses.softmax_cross_entropy(
logits=logits,
onehot_labels=one_hot_labels,
)
dst_l2_loss = FLAGS.weight_decay * tf.add_n([
tf.nn.l2_loss(v) for v in tf.trainable_variables()
if 'batch_normalization' not in v.name and 'kernel' in v.name
])
loss = dst_loss + dst_l2_loss
train_op = None
if mode == tf.estimator.ModeKeys.TRAIN:
cur_finetune_step = tf.train.get_global_step()
update_ops = tf.get_collection(tf.GraphKeys.UPDATE_OPS)
with tf.control_dependencies(update_ops):
finetune_learning_rate = lr_schedule()
optimizer = tf.train.AdamOptimizer(finetune_learning_rate)
train_op = tf.contrib.slim.learning.create_train_op(
loss, optimizer)
with tf.variable_scope('finetune'):
train_op = optimizer.minimize(loss, cur_finetune_step)
else:
train_op = None
eval_metrics = None
if mode == tf.estimator.ModeKeys.EVAL:
eval_metrics = model_utils.metric_fn(labels, logits)
if mode == tf.estimator.ModeKeys.TRAIN:
with tf.control_dependencies([train_op]):
tf.summary.scalar('classifier/finetune_lr',
finetune_learning_rate)
else:
train_op = None
return tf.estimator.EstimatorSpec(
mode=mode,
loss=loss,
train_op=train_op,
eval_metric_ops=eval_metrics,
)
# Use function binding to create all the builder functions that are neeeded:
bound_train_model = partial(model, lr_placeholder, outfeed_train_queue, True)
bound_train_loop = partial(loop_builder, batches_per_step, bound_train_model,
infeed_train_queue)
bound_test_model = partial(model, lr_placeholder, outfeed_test_queue, False)
bound_test_loop = partial(loop_builder, test_batches, bound_test_model,
infeed_test_queue)
# Use the bound builder functions to place the model on the IPU:
with scopes.ipu_scope("/device:IPU:0"):
train_loop = ipu_compiler.compile(bound_train_loop, inputs=[])
test_loop = ipu_compiler.compile(bound_test_loop, inputs=[])
# Initialisers should go on the CPU:
with tf.device("cpu"):
metrics_vars = tf.get_collection(tf.GraphKeys.LOCAL_VARIABLES,
scope="metrics")
metrics_initializer = tf.variables_initializer(var_list=metrics_vars)
saver = tf.train.Saver()
# Setup and acquire an IPU device:
config = utils.create_ipu_config()
config = utils.auto_select_ipus(config, 1)
utils.configure_ipu_system(config)
# These allow us to retrieve the results of IPU feeds:
dequeue_train_outfeed = outfeed_train_queue.dequeue()
dequeue_test_outfeed = outfeed_test_queue.dequeue()
# Create a benchmark program for the infeed to determine maximum achievable throughput:
infeed_perf = dataset_benchmark.infeed_benchmark(infeed_train_queue, epochs,
num_train, True)