def get_deepspeech(input_dim,
output_dim,
context=9,
units=2048,
dropouts=(0.05, 0.05, 0.05, 0, 0.05),
tflite_version=False,
is_mixed_precision=False,
lstm_implementation=2,
random_state=1) -> keras.Model:
"""
The `get_deepspeech` returns the graph definition of the DeepSpeech
model. Default parameters are overwritten only where it is needed.
Reference:
"Deep Speech: Scaling up end-to-end speech recognition."
(https://arxiv.org/abs/1412.5567)
"""
if is_mixed_precision:
policy = mixed_precision.Policy('mixed_float16')
mixed_precision.set_policy(policy)
if dropouts[3] != 0:
logger.warning("Mozilla DeepSpeech doesn't use dropout "
"after LSTM(dropouts[3]). Be careful!")
np.random.seed(random_state)
tf.random.set_seed(random_state)
max_seq_length = None
if tflite_version:
max_seq_length = 1
with tf.device('/gpu:0'):
input_tensor = layers.Input([max_seq_length, input_dim], name='X')
# Add 4th dimension [batch, time, frequency, channel]
x = layers.Lambda(keras.backend.expand_dims,
arguments=dict(axis=3))(input_tensor)
# Fill zeros around time dimension
x = layers.ZeroPadding2D(padding=(context, 0))(x)
# Convolve signal in time dim
receptive_field = (2 * context + 1, input_dim)
x = layers.Conv2D(filters=units, kernel_size=receptive_field)(x)
# Squeeze into 3rd dim array
x = layers.Lambda(keras.backend.squeeze, arguments=dict(axis=2))(x)
x = layers.ReLU()(x)
x = layers.Dropout(rate=dropouts[0])(x)
x = layers.TimeDistributed(layers.Dense(units), name='td_dense_2')(x)
x = layers.ReLU(max_value=20)(x)
x = layers.Dropout(rate=dropouts[1])(x)
x = layers.TimeDistributed(layers.Dense(units), name='td_dense_3')(x)
x = layers.ReLU(max_value=20)(x)
x = layers.Dropout(rate=dropouts[2])(x)
x = layers.LSTM(units,
return_sequences=True,
name='lstm_1',
unroll=tflite_version,
implementation=lstm_implementation)(x)
x = layers.Dropout(rate=dropouts[3])(x)
x = layers.TimeDistributed(layers.Dense(units), name='td_dense_4')(x)
x = layers.ReLU(max_value=20)(x)
x = layers.Dropout(rate=dropouts[4])(x)
x = layers.TimeDistributed(layers.Dense(output_dim),
name='td_dense_5')(x)
model = keras.Model(input_tensor, x, name='DeepSpeech')
if is_mixed_precision: # revert policy
policy = mixed_precision.Policy('float32')
mixed_precision.set_policy(policy)
return model
'bbox': nms.nmsed_boxes,
'classes': nms.nmsed_classes,
'confidence': nms.nmsed_scores,
}
if __name__ == '__main__':
from yolo.utils.run_utils import prep_gpu
from yolo.configs import yolo as exp_cfg
from yolo.tasks.yolo import YoloTask
import yolo.utils.export.tensor_rt as trt
prep_gpu()
from tensorflow.keras.mixed_precision import experimental as mixed_precision
mixed_precision.set_policy('float16')
# init a fake webcam
# ls /dev/video*
# sudo modprobe -r v4l2loopback
# sudo modprobe v4l2loopback devices=1 video_nr=20 card_label="v4l2loopback" exclusive_caps=1
# name = "saved_models/v4/regular"
# new_name = f"{name}_tensorrt"
# model = trt.TensorRT(saved_model=new_name, save_new_path=new_name, max_workspace_size_bytes=4000000000, max_batch_size=5)#, precision_mode="INT8", use_calibration=True)
# model.compile()
# model.summary()
# model.set_postprocessor_fn(func)
config = exp_cfg.YoloTask()
task = YoloTask(config)
def train(strategy, cfg):
os.makedirs(cfg.MODEL.SAVE_DIR, exist_ok=True)
if cfg.DATASET.BFLOAT16:
policy = mixed_precision.Policy('mixed_bfloat16')
mixed_precision.set_policy(policy)
tf.random.set_seed(cfg.TRAIN.SEED)
np.random.seed(cfg.TRAIN.SEED)
spe = int(np.ceil(cfg.DATASET.TRAIN_SAMPLES / cfg.TRAIN.BATCH_SIZE))
spv = cfg.DATASET.VAL_SAMPLES // cfg.VAL.BATCH_SIZE
if cfg.TRAIN.SCALE_LR:
lr = cfg.TRAIN.BASE_LR * cfg.TRAIN.BATCH_SIZE / 32
cfg.TRAIN.WARMUP_FACTOR = 32 / cfg.TRAIN.BATCH_SIZE
else:
lr = cfg.TRAIN.BASE_LR
if cfg.TRAIN.LR_SCHEDULE == 'warmup_cosine_decay':
lr_schedule = WarmupCosineDecay(
initial_learning_rate=lr,
decay_steps=cfg.TRAIN.EPOCHS * spe,
warmup_steps=cfg.TRAIN.WARMUP_EPOCHS * spe,
warmup_factor=cfg.TRAIN.WARMUP_FACTOR)
elif cfg.TRAIN.LR_SCHEDULE == 'warmup_piecewise':
lr_schedule = WarmupPiecewise(
boundaries=[x * spe for x in cfg.TRAIN.DECAY_EPOCHS],
values=[lr, lr / 10, lr / 10 ** 2],
warmup_steps=spe * cfg.TRAIN.WARMUP_EPOCHS,
warmup_factor=cfg.TRAIN.WARMUP_FACTOR)
else:
lr_schedule = lr
with strategy.scope():
optimizer = tf.keras.optimizers.Adam(lr_schedule)
if cfg.TRAIN.WANDB_RUN_ID:
api = wandb.Api()
run = api.run(f"{cfg.EVAL.WANDB_RUNS}/{cfg.TRAIN.WANDB_RUN_ID}")
run.file("model-best.h5").download(replace=True)
model = tf.keras.models.load_model('model-best.h5',
custom_objects={
'relu6': tf.nn.relu6,
'WarmupCosineDecay': WarmupCosineDecay
})
model.compile(optimizer=model.optimizer, loss=mse)
else:
if cfg.MODEL.TYPE == 'simple_baseline':
model = SimpleBaseline(cfg)
elif cfg.MODEL.TYPE == 'hrnet':
model = HRNet(cfg)
elif cfg.MODEL.TYPE == 'evopose':
model = EvoPose(cfg)
elif cfg.MODEL.TYPE == 'eflite':
model = EfficientNetLite(cfg)
elif cfg.MODEL.TYPE == 'ef':
model = EfficientNet(cfg)
model.compile(optimizer=optimizer, loss=mse)
cfg.DATASET.OUTPUT_SHAPE = model.output_shape[1:]
cfg.DATASET.SIGMA = 2 * cfg.DATASET.OUTPUT_SHAPE[0] / 64
wandb_config = setup_wandb(cfg, model)
train_ds = load_tfds(cfg, 'train')
train_ds = strategy.experimental_distribute_dataset(train_ds)
if cfg.TRAIN.VAL:
val_ds = load_tfds(cfg, 'val')
val_ds = strategy.experimental_distribute_dataset(val_ds)
print('Training {} ({} / {}) on {} for {} epochs'
.format(cfg.MODEL.NAME, wandb_config.parameters,
wandb_config.flops, cfg.TRAIN.ACCELERATOR, cfg.TRAIN.EPOCHS))
initial_epoch = 0
if cfg.TRAIN.WANDB_RUN_ID:
initial_epoch = cfg.TRAIN.INITIAL_EPOCH
model.fit(train_ds, initial_epoch=initial_epoch, epochs=cfg.TRAIN.EPOCHS, verbose=1,
validation_data=val_ds,
validation_steps=spv,
steps_per_epoch=spe,
callbacks=[WandbCallback()])
return model
def train(datadir, var_dict, output_vars, filters, kernels, lr, batch_size,
early_stopping_patience, epochs, exp_id, model_save_dir,
pred_save_dir, train_years, valid_years, test_years, lead_time, gpu,
norm_subsample, data_subsample, lr_step, lr_divide, network_type,
restore_best_weights, bn_position, nt_in, dt_in, use_bias, l2, skip,
dropout, reduce_lr_patience, reduce_lr_factor, min_lr_times, unres,
loss, cmip, cmip_dir, pretrained_model, last_pretrained_layer,
last_trainable_layer, min_es_delta, optimizer, activation, ext_mean,
ext_std, cont_time, multi_dt, momentum, parametric, one_cycle,
long_skip, train_tfr_files, valid_tfr_files, test_tfr_files,
tfr_num_parallel_calls, tfr_buffer_size, tfr_prefetch, y_roll,
X_roll, discard_first, min_lead_time, relu_idxs, tp_log,
tfr_out_idxs, predict_difference, is_categorical, bin_min, bin_max,
num_bins, quantile_bins, **kwargs):
print(type(var_dict))
# os.environ["CUDA_VISIBLE_DEVICES"]=str(2)
# # Limit TF memory usage
# limit_mem()
os.environ["CUDA_VISIBLE_DEVICES"] = ','.join([str(g) for g in gpu])
mirrored_strategy = tf.distribute.MirroredStrategy(
devices=[f"/gpu:{i}" for i, g in enumerate(gpu)])
# Mixed precicion policy
policy = mixed_precision.Policy('mixed_float16')
mixed_precision.set_policy(policy)
# Open dataset and create data generators
if cmip:
if len(cmip_dir) > 1:
dg_train, dg_valid, dg_test = [], [], []
for cd in cmip_dir:
dgtr, dgv, dgte = load_data(
var_dict,
datadir,
cmip,
cd,
train_years,
valid_years,
test_years,
lead_time,
batch_size,
output_vars,
data_subsample,
norm_subsample,
nt_in,
dt_in,
ext_mean=ext_mean,
ext_std=ext_std,
cont_time=cont_time,
multi_dt=multi_dt,
train_tfr_files=train_tfr_files,
valid_tfr_files=valid_tfr_files,
test_tfr_files=test_tfr_files,
tfr_num_parallel_calls=tfr_num_parallel_calls,
tfr_buffer_size=tfr_buffer_size,
tfr_prefetch=tfr_prefetch,
y_roll=y_roll,
X_roll=X_roll,
discard_first=discard_first,
min_lead_time=min_lead_time,
tp_log=tp_log,
tfr_out_idxs=tfr_out_idxs,
predict_difference=predict_difference,
is_categorical=is_categorical,
bin_min=bin_min,
bin_max=bin_max,
num_bins=num_bins,
quantile_bins=quantile_bins)
dg_train.append(dgtr)
dg_valid.append(dgv)
dg_test.append(dgte)
dg_train, dg_valid, dg_test = [
CombinedDataGenerator(dg, batch_size)
for dg in [dg_train, dg_valid, dg_test]
]
else:
dg_train, dg_valid, dg_test = load_data(
var_dict,
datadir,
cmip,
cmip_dir[0],
train_years,
valid_years,
test_years,
lead_time,
batch_size,
output_vars,
data_subsample,
norm_subsample,
nt_in,
dt_in,
ext_mean=ext_mean,
ext_std=ext_std,
cont_time=cont_time,
multi_dt=multi_dt,
train_tfr_files=train_tfr_files,
valid_tfr_files=valid_tfr_files,
test_tfr_files=test_tfr_files,
tfr_num_parallel_calls=tfr_num_parallel_calls,
tfr_buffer_size=tfr_buffer_size,
tfr_prefetch=tfr_prefetch,
y_roll=y_roll,
X_roll=X_roll,
discard_first=discard_first,
min_lead_time=min_lead_time,
tp_log=tp_log,
tfr_out_idxs=tfr_out_idxs,
predict_difference=predict_difference,
is_categorical=is_categorical,
bin_min=bin_min,
bin_max=bin_max,
num_bins=num_bins,
quantile_bins=quantile_bins)
else:
dg_train, dg_valid, dg_test = load_data(
var_dict,
datadir,
cmip,
cmip_dir,
train_years,
valid_years,
test_years,
lead_time,
batch_size,
output_vars,
data_subsample,
norm_subsample,
nt_in,
dt_in,
ext_mean=ext_mean,
ext_std=ext_std,
cont_time=cont_time,
multi_dt=multi_dt,
train_tfr_files=train_tfr_files,
valid_tfr_files=valid_tfr_files,
test_tfr_files=test_tfr_files,
tfr_num_parallel_calls=tfr_num_parallel_calls,
tfr_buffer_size=tfr_buffer_size,
tfr_prefetch=tfr_prefetch,
y_roll=y_roll,
X_roll=X_roll,
discard_first=discard_first,
min_lead_time=min_lead_time,
tp_log=tp_log,
tfr_out_idxs=tfr_out_idxs,
predict_difference=predict_difference,
is_categorical=is_categorical,
bin_min=bin_min,
bin_max=bin_max,
num_bins=num_bins,
quantile_bins=quantile_bins)
# Build model
if pretrained_model is not None:
pretrained_model = keras.models.load_model(pretrained_model,
custom_objects={
'PeriodicConv2D':
PeriodicConv2D,
'ChannelReLU2D':
ChannelReLU2D,
'lat_mse':
keras.losses.mse,
'lat_mae':
keras.losses.mse
})
with mirrored_strategy.scope():
if network_type == 'resnet':
model = build_resnet(filters,
kernels,
input_shape=dg_train.shape,
bn_position=bn_position,
use_bias=use_bias,
l2=l2,
skip=skip,
dropout=dropout,
activation=activation,
long_skip=long_skip,
relu_idxs=relu_idxs,
categorical=is_categorical,
nvars=len(dg_train.output_idxs))
elif network_type == 'uresnet':
model = build_uresnet(filters,
kernels,
unres,
input_shape=dg_train.shape,
bn_position=bn_position,
use_bias=use_bias,
l2=l2,
skip=skip,
dropout=dropout,
activation=activation)
if pretrained_model is not None:
# Copy over weights
for i, l in enumerate(pretrained_model.layers):
model.layers[i].set_weights(l.get_weights())
if l.name == last_pretrained_layer: break
# Set trainable to false
if last_trainable_layer is not None:
for l in model.layers:
l.trainable = False
if l.name == last_trainable_layer: break
if multi_dt > 1:
model = create_multi_dt_model(model, multi_dt, dg_train)
if loss == 'lat_mse':
loss = create_lat_mse(dg_train.data.lat)
if loss == 'lat_mae':
loss = create_lat_mae(dg_train.data.lat)
if loss == 'lat_rmse':
loss = create_lat_rmse(dg_train.data.lat)
if loss == 'lat_crps':
loss = create_lat_crps(dg_train.data.lat,
len(dg_train.output_idxs))
if loss == 'lat_crps_relu':
loss = create_lat_crps(dg_train.data.lat,
len(dg_train.output_idxs),
relu=True)
if loss == 'lat_crps_mae':
loss = create_lat_crps_mae(dg_train.data.lat,
len(dg_train.output_idxs))
if loss == 'lat_crps_lcgev':
loss = create_lat_crps_lcgev(dg_train.data.lat,
len(dg_train.output_idxs))
if loss == 'lat_log_loss':
loss = create_lat_log_loss(dg_train.data.lat,
len(dg_train.output_idxs))
if loss == 'lat_categorical_crossentropy':
loss = create_lat_categorical_loss(dg_train.data.lat,
len(dg_train.output_idxs))
if optimizer == 'adam':
opt = keras.optimizers.Adam(lr)
elif optimizer == 'adadelta':
opt = keras.optimizers.Adadelta(lr)
elif optimizer == 'sgd':
opt = keras.optimizers.SGD(lr, momentum=momentum, nesterov=True)
elif optimizer == 'rmsprop':
opt = keras.optimizers.RMSprop(lr, momentum=momentum)
model.compile(opt, loss)
print(model.summary())
# Learning rate settings
callbacks = []
if early_stopping_patience is not None:
callbacks.append(
tf.keras.callbacks.EarlyStopping(
patience=early_stopping_patience,
verbose=1,
min_delta=min_es_delta,
mode='auto',
restore_best_weights=restore_best_weights))
if reduce_lr_patience is not None:
callbacks.append(
tf.keras.callbacks.ReduceLROnPlateau(
patience=reduce_lr_patience,
factor=reduce_lr_factor,
verbose=1,
min_lr=reduce_lr_factor**min_lr_times * lr,
))
if lr_step is not None:
callbacks.append(
keras.callbacks.LearningRateScheduler(
LRUpdate(lr, lr_step, lr_divide)))
if one_cycle:
callbacks.append(
OneCycleLR(
lr,
maximum_momentum=None if not optimizer == 'sgd' else 0.95,
minimum_momentum=None if not optimizer == 'sgd' else 0.85,
verbose=1))
# Train model
history = model.fit(dg_train.tfr_dataset or dg_train,
epochs=epochs,
validation_data=dg_valid.tfr_dataset or dg_valid,
callbacks=callbacks)
print(f'Saving model: {model_save_dir}/{exp_id}.h5')
model.save(f'{model_save_dir}/{exp_id}.h5')
print(f'Saving model weights: {model_save_dir}/{exp_id}_weights.h5')
model.save_weights(f'{model_save_dir}/{exp_id}_weights.h5')
print(f'Saving training_history: {model_save_dir}/{exp_id}_history.pkl')
to_pickle(history.history, f'{model_save_dir}/{exp_id}_history.pkl')
print(
f'Saving norm files: {model_save_dir}/{exp_id}_mean.nc and {model_save_dir}/{exp_id}_std.nc'
)
dg_train.mean.to_netcdf(f'{model_save_dir}/{exp_id}_mean.nc')
dg_train.std.to_netcdf(f'{model_save_dir}/{exp_id}_std.nc')
# Create predictions
preds = create_predictions(model,
dg_test,
parametric=parametric,
multi_dt=multi_dt > 1)
if len(preds.lat) != 32:
preds = regrid(preds, ddeg_out=5.625)
print(f'Saving predictions: {pred_save_dir}/{exp_id}.nc')
preds.to_netcdf(f'{pred_save_dir}/{exp_id}.nc')
# Print score in real units
if not cmip:
if '5.625deg' in datadir:
valdir = datadir
else:
valdir = '/'.join(datadir.split('/')[:-2] + ['5.625deg/'])
z500_valid = load_test_data(f'{valdir}geopotential_500',
'z',
years=slice(test_years[0],
test_years[1])).drop('level')
t850_valid = load_test_data(f'{valdir}temperature_850',
't',
years=slice(test_years[0],
test_years[1])).drop('level')
tp = xr.open_mfdataset(
f'{valdir}/6hr_precipitation/*.nc',
combine='by_coords').sel(time=slice(test_years[0], test_years[1]))
t2m = xr.open_mfdataset(
f'{valdir}/2m_temperature/*.nc',
combine='by_coords').sel(time=slice(test_years[0], test_years[1]))
valid = xr.merge([z500_valid, t850_valid, tp, t2m])
print(compute_weighted_rmse(preds, valid).load())
def train_updnet(
multicoil=True,
brain=False,
af=4,
contrast=None,
cuda_visible_devices='0123',
n_samples=None,
n_epochs=200,
n_iter=10,
use_mixed_precision=False,
n_layers=3,
base_n_filter=16,
non_linearity='relu',
channel_attention_kwargs=None,
refine_smaps=False,
loss='mae',
original_run_id=None,
fixed_masks=False,
n_epochs_original=250,
equidistant_fake=False,
mask_type=None,
):
if brain:
n_volumes = brain_n_volumes_train
else:
n_volumes = n_volumes_train
# paths
if multicoil:
if brain:
train_path = f'{FASTMRI_DATA_DIR}brain_multicoil_train/'
val_path = f'{FASTMRI_DATA_DIR}brain_multicoil_val/'
else:
train_path = f'{FASTMRI_DATA_DIR}multicoil_train/'
val_path = f'{FASTMRI_DATA_DIR}multicoil_val/'
else:
train_path = f'{FASTMRI_DATA_DIR}singlecoil_train/singlecoil_train/'
val_path = f'{FASTMRI_DATA_DIR}singlecoil_val/'
os.environ["CUDA_VISIBLE_DEVICES"] = ','.join(cuda_visible_devices)
af = int(af)
# trying mixed precision
if use_mixed_precision:
policy_type = 'mixed_float16'
else:
policy_type = 'float32'
policy = mixed_precision.Policy(policy_type)
mixed_precision.set_policy(policy)
# generators
if multicoil:
dataset = multicoil_dataset
if mask_type is None:
if brain:
if equidistant_fake:
mask_type = 'equidistant_fake'
else:
mask_type = 'equidistant'
else:
mask_type = 'random'
kwargs = {
'parallel': False,
'output_shape_spec': brain,
'mask_type': mask_type,
}
else:
dataset = singlecoil_dataset
kwargs = {}
train_set = dataset(
train_path,
AF=af,
contrast=contrast,
inner_slices=None,
rand=True,
scale_factor=1e6,
n_samples=n_samples,
fixed_masks=fixed_masks,
**kwargs
)
val_set = dataset(
val_path,
AF=af,
contrast=contrast,
inner_slices=None,
rand=True,
scale_factor=1e6,
**kwargs
)
run_params = {
'n_primal': 5,
'n_dual': 1,
'primal_only': True,
'multicoil': multicoil,
'n_layers': n_layers,
'layers_n_channels': [base_n_filter * 2**i for i in range(n_layers)],
'non_linearity': non_linearity,
'n_iter': n_iter,
'channel_attention_kwargs': channel_attention_kwargs,
'refine_smaps': refine_smaps,
'output_shape_spec': brain,
}
if multicoil:
updnet_type = 'updnet_sense_'
if brain:
updnet_type += 'brain_'
else:
updnet_type = 'updnet_singlecoil_'
additional_info = f'af{af}'
if contrast is not None:
additional_info += f'_{contrast}'
if n_samples is not None:
additional_info += f'_{n_samples}'
if n_iter != 10:
additional_info += f'_i{n_iter}'
if non_linearity != 'relu':
additional_info += f'_{non_linearity}'
if n_layers != 3:
additional_info += f'_l{n_layers}'
if base_n_filter != 16:
additional_info += f'_bf{base_n_filter}'
if loss != 'mae':
additional_info += f'_{loss}'
if channel_attention_kwargs:
additional_info += '_ca'
if refine_smaps:
additional_info += '_rf_sm'
if fixed_masks:
additional_info += '_fixed_masks'
run_id = f'{updnet_type}_{additional_info}_{int(time.time())}'
chkpt_path = f'{CHECKPOINTS_DIR}checkpoints/{run_id}' + '-{epoch:02d}.hdf5'
chkpt_cback = ModelCheckpoint(chkpt_path, period=n_epochs, save_weights_only=True)
log_dir = op.join(f'{LOGS_DIR}logs', run_id)
tboard_cback = TensorBoard(
profile_batch=0,
log_dir=log_dir,
histogram_freq=0,
write_graph=False,
write_images=False,
)
tqdm_cback = TQDMProgressBar()
model = UPDNet(**run_params)
if original_run_id is not None:
lr = 1e-7
n_steps = brain_volumes_per_contrast['train'].get(contrast, n_volumes//2)
else:
lr = 1e-4
n_steps = n_volumes
default_model_compile(model, lr=lr, loss=loss)
print(run_id)
if original_run_id is not None:
if os.environ.get('FASTMRI_DEBUG'):
n_epochs_original = 1
model.load_weights(f'{CHECKPOINTS_DIR}checkpoints/{original_run_id}-{n_epochs_original:02d}.hdf5')
model.fit(
train_set,
steps_per_epoch=n_steps,
epochs=n_epochs,
validation_data=val_set,
validation_steps=2,
verbose=0,
callbacks=[tboard_cback, chkpt_cback, tqdm_cback],
)
return run_id
def get_deepspeech2(input_dim,
output_dim,
is_mixed_precision=True,
rnn_units=800,
random_state=1) -> keras.Model:
if is_mixed_precision:
policy = mixed_precision.Policy('mixed_float16')
mixed_precision.set_policy(policy)
np.random.seed(random_state)
tf.random.set_seed(random_state)
# Create model under CPU scope and avoid OOM, errors during concatenation
# a large distributed model.
with tf.device('/cpu:0'):
# Define input tensor [batch, time, features]
input_tensor = layers.Input([None, input_dim], name='X')
# Add 4th dimension [batch, time, frequency, channel]
x = layers.Lambda(keras.backend.expand_dims,
arguments=dict(axis=-1))(input_tensor)
x = layers.Conv2D(filters=32,
kernel_size=[11, 41],
strides=[2, 2],
padding='same',
use_bias=False,
name='conv_1')(x)
x = layers.BatchNormalization(name='conv_1_bn')(x)
x = layers.ReLU(name='conv_1_relu')(x)
x = layers.Conv2D(filters=32,
kernel_size=[11, 21],
strides=[1, 2],
padding='same',
use_bias=False,
name='conv_2')(x)
x = layers.BatchNormalization(name='conv_2_bn')(x)
x = layers.ReLU(name='conv_2_relu')(x)
# We need to squeeze to 3D tensor. Thanks to the stride in frequency
# domain, we reduce the number of features four times for each channel.
x = layers.Reshape([-1, input_dim // 4 * 32])(x)
for i in [1, 2, 3, 4, 5]:
recurrent = layers.GRU(units=rnn_units,
activation='tanh',
recurrent_activation='sigmoid',
use_bias=True,
return_sequences=True,
reset_after=True,
name=f'gru_{i}')
x = layers.Bidirectional(recurrent,
name=f'bidirectional_{i}',
merge_mode='concat')(x)
x = layers.Dropout(rate=0.5)(x) if i < 5 else x # Only between
# Return at each time step logits along characters. Then CTC
# computation is more stable, in contrast to the softmax.
x = layers.TimeDistributed(layers.Dense(units=rnn_units * 2),
name='dense_1')(x)
x = layers.ReLU(name='dense_1_relu')(x)
x = layers.Dropout(rate=0.5)(x)
output_tensor = layers.TimeDistributed(layers.Dense(units=output_dim),
name='dense_2')(x)
model = keras.Model(input_tensor, output_tensor, name='DeepSpeech2')
return model
def change_policy(policy): from tensorflow.keras.mixed_precision import experimental as mixed_precision mixed_precision.set_policy(policy) return
def train_dealiaser(
model_fun,
model_kwargs,
run_id,
n_scales=0,
multicoil=False,
af=4,
contrast=None,
cuda_visible_devices='0123',
n_samples=None,
n_epochs=200,
use_mixed_precision=False,
loss='mae',
original_run_id=None,
fixed_masks=False,
n_steps_per_epoch=973,
):
# paths
if multicoil:
train_path = f'{FASTMRI_DATA_DIR}multicoil_train/'
val_path = f'{FASTMRI_DATA_DIR}multicoil_val/'
else:
train_path = f'{FASTMRI_DATA_DIR}singlecoil_train/singlecoil_train/'
val_path = f'{FASTMRI_DATA_DIR}singlecoil_val/'
os.environ["CUDA_VISIBLE_DEVICES"] = ','.join(cuda_visible_devices)
af = int(af)
# trying mixed precision
if use_mixed_precision:
policy_type = 'mixed_float16'
else:
policy_type = 'float32'
policy = mixed_precision.Policy(policy_type)
mixed_precision.set_policy(policy)
# generators
if multicoil:
dataset = multicoil_dataset
kwargs = {'parallel': False}
else:
dataset = singlecoil_dataset
kwargs = {}
train_set = dataset(
train_path,
AF=af,
contrast=contrast,
inner_slices=None,
rand=True,
scale_factor=1e6,
n_samples=n_samples,
fixed_masks=fixed_masks,
**kwargs
)
val_set = dataset(
val_path,
AF=af,
contrast=contrast,
inner_slices=None,
rand=True,
scale_factor=1e6,
**kwargs
)
additional_info = f'af{af}'
if contrast is not None:
additional_info += f'_{contrast}'
if n_samples is not None:
additional_info += f'_{n_samples}'
if loss != 'mae':
additional_info += f'_{loss}'
if fixed_masks:
additional_info += '_fixed_masks'
run_id = f'{run_id}_{additional_info}_{int(time.time())}'
chkpt_path = f'{CHECKPOINTS_DIR}checkpoints/{run_id}' + '-{epoch:02d}.hdf5'
chkpt_cback = ModelCheckpoint(chkpt_path, period=n_epochs, save_weights_only=True)
log_dir = op.join(f'{LOGS_DIR}logs', run_id)
tboard_cback = TensorBoard(
profile_batch=0,
log_dir=log_dir,
histogram_freq=0,
write_graph=False,
write_images=False,
)
tqdm_cback = TQDMProgressBar()
model = MultiscaleComplex(
model_fun=model_fun,
model_kwargs=model_kwargs,
res=False,
n_scales=n_scales,
fastmri_format=True,
)
if original_run_id is not None:
lr = 1e-7
n_steps = n_steps_per_epoch//2
else:
lr = 1e-4
n_steps = n_steps_per_epoch
default_model_compile(model, lr=lr, loss=loss)
print(run_id)
if original_run_id is not None:
if os.environ.get('FASTMRI_DEBUG'):
n_epochs_original = 1
else:
n_epochs_original = 250
model(next(iter(train_set))[0])
model.load_weights(f'{CHECKPOINTS_DIR}checkpoints/{original_run_id}-{n_epochs_original:02d}.hdf5')
model.fit(
train_set,
steps_per_epoch=n_steps,
epochs=n_epochs,
validation_data=val_set,
validation_steps=5,
validation_freq=5,
verbose=0,
callbacks=[tboard_cback, chkpt_cback, tqdm_cback],
)
return run_id
def main(logdir, config):
logdir = pathlib.Path(logdir).expanduser()
config.traindir = config.traindir or logdir / 'train_eps'
config.evaldir = config.evaldir or logdir / 'eval_eps'
config.steps //= config.action_repeat
config.eval_every //= config.action_repeat
config.log_every //= config.action_repeat
config.time_limit //= config.action_repeat
config.act = getattr(tf.nn, config.act)
if config.debug:
tf.config.experimental_run_functions_eagerly(True)
if config.gpu_growth:
message = 'No GPU found. To actually train on CPU remove this assert.'
assert tf.config.experimental.list_physical_devices('GPU'), message
for gpu in tf.config.experimental.list_physical_devices('GPU'):
tf.config.experimental.set_memory_growth(gpu, True)
assert config.precision in (16, 32), config.precision
if config.precision == 16:
prec.set_policy(prec.Policy('mixed_float16'))
print('Logdir', logdir)
logdir.mkdir(parents=True, exist_ok=True)
config.traindir.mkdir(parents=True, exist_ok=True)
config.evaldir.mkdir(parents=True, exist_ok=True)
step = count_steps(config.traindir)
logger = tools.Logger(logdir, config.action_repeat * step)
print('Create envs.')
if config.offline_traindir:
directory = config.offline_traindir.format(**vars(config))
else:
directory = config.traindir
train_eps = tools.load_episodes(directory, limit=config.dataset_size)
if config.offline_evaldir:
directory = config.offline_evaldir.format(**vars(config))
else:
directory = config.evaldir
eval_eps = tools.load_episodes(directory, limit=1)
make = lambda mode: make_env(config, logger, mode, train_eps, eval_eps)
train_envs = [make('train') for _ in range(config.envs)]
eval_envs = [make('eval') for _ in range(config.envs)]
acts = train_envs[0].action_space
config.num_actions = acts.n if hasattr(acts, 'n') else acts.shape[0]
prefill = max(0, config.prefill - count_steps(config.traindir))
print(f'Prefill dataset ({prefill} steps).')
random_agent = lambda o, d, s: ([acts.sample() for _ in d], s)
tools.simulate(random_agent, train_envs, prefill)
tools.simulate(random_agent, eval_envs, episodes=1)
logger.step = config.action_repeat * count_steps(config.traindir)
print('Simulate agent.')
train_dataset = make_dataset(train_eps, config)
eval_dataset = iter(make_dataset(eval_eps, config))
agent = Dreamer(config, logger, train_dataset)
if (logdir / 'variables.pkl').exists():
agent.load(logdir / 'variables.pkl')
agent._should_pretrain._once = False
state = None
while agent._step.numpy().item() < config.steps:
logger.write()
print('Start evaluation.')
video_pred = agent._wm.video_pred(next(eval_dataset))
logger.video('eval_openl', video_pred)
eval_policy = functools.partial(agent, training=False)
tools.simulate(eval_policy, eval_envs, episodes=1)
print('Start training.')
state = tools.simulate(agent, train_envs, config.eval_every, state=state)
agent.save(logdir / 'variables.pkl')
for env in train_envs + eval_envs:
try:
env.close()
except Exception:
pass
def train_model(data_path,
batch_size,
image_size,
crop_size,
lr_schedule_name,
init_lr,
max_lr,
weight_decay,
optimizer,
model_type,
embedding_size,
num_epochs,
checkpoint_path,
margin=0.5,
cache_path=None,
range_test=False,
use_tpu=False,
tpu_name=None,
use_mixed_precision=False,
distributed=False,
eager_execution=False,
weights_path='',
checkpoint_interval=5000,
step_size=6000,
recompile=False,
steps_per_epoch=None,
logist_scale=64):
if use_tpu is True:
assert tpu_name is not None, '[ERROR] TPU name must be specified'
resolver = tf.distribute.cluster_resolver.TPUClusterResolver(
tpu=tpu_name)
tf.config.experimental_connect_to_cluster(resolver)
tf.tpu.experimental.initialize_tpu_system(resolver)
strategy = tf.distribute.experimental.TPUStrategy(resolver)
print("[INFO] TPUs: ", tf.config.list_logical_devices('TPU'))
if use_mixed_precision is True:
if use_tpu is True:
policy = mixed_precision.Policy('mixed_bfloat16')
else:
policy = mixed_precision.Policy('mixed_float16')
mixed_precision.set_policy(policy)
print(
"[INFO] Using mixed precision for training. This will reduce memory consumption\n"
)
if distributed is True and use_tpu is False:
mirrored_strategy = tf.distribute.MirroredStrategy()
print("[INFO] Using distributed training strategy on GPU")
train_dataset, n_imgs, n_classes = generate_training_dataset(
data_path=data_path,
image_size=image_size,
batch_size=batch_size,
crop_size=crop_size,
cache=cache_path,
use_mixed_precision=use_mixed_precision,
use_tpu=use_tpu,
model_type=model_type)
test_dataset = None
run_eagerly = eager_execution if eager_execution is not None else False
log_dir = './logs/log_' + datetime.now().strftime("%Y%m%d_%H%M%S")
tensorboard_callback = tf.keras.callbacks.TensorBoard(log_dir=log_dir,
update_freq=100,
write_graph=False)
stop_on_nan = tf.keras.callbacks.TerminateOnNaN()
loss_fn = SoftmaxLoss()
if range_test is True:
range_finder = RangeTestCallback(start_lr=init_lr,
end_lr=max_lr,
n_imgs=n_imgs,
batch_size=batch_size)
opt = get_optimizer(optimizer_name=optimizer,
lr_schedule=1e-5,
weight_decay=weight_decay)
if use_tpu is True:
with strategy.scope():
model, compiled = create_neural_network(
model_type=model_type,
embedding_size=embedding_size,
weights_path=weights_path,
n_classes=n_classes,
recompile=recompile,
input_shape=[crop_size, crop_size, 3],
training=True,
margin=margin,
logist_scale=logist_scale)
assert model is not None, '[ERROR] There was a problem while loading the pre-trained weights'
if compiled is False:
print(
'[INFO] Recompiling model using passed optimizer and loss arguments'
)
model.compile(optimizer=opt,
loss=loss_fn,
run_eagerly=run_eagerly)
elif distributed is True and use_tpu is False:
with mirrored_strategy.scope():
model, compiled = create_neural_network(
model_type=model_type,
embedding_size=embedding_size,
weights_path=weights_path,
n_classes=n_classes,
recompile=recompile,
input_shape=[crop_size, crop_size, 3],
training=True,
margin=margin,
logist_scale=logist_scale)
opt = get_optimizer(
optimizer_name=optimizer,
lr_schedule=1e-5,
weight_decay=weight_decay
) # Optimizer must be created within scope!
assert model is not None, '[ERROR] There was a problem while loading the pre-trained weights'
if compiled is False:
print(
'[INFO] Recompiling model using passed optimizer and loss arguments'
)
model.compile(optimizer=opt,
loss=loss_fn,
run_eagerly=run_eagerly)
else:
model, compiled = create_neural_network(
model_type=model_type,
embedding_size=embedding_size,
weights_path=weights_path,
n_classes=n_classes,
recompile=recompile,
input_shape=[crop_size, crop_size, 3],
training=True,
margin=margin,
logist_scale=logist_scale)
assert model is not None, '[ERROR] There was a problem while loading the pre-trained weights'
if compiled is False:
print(
'[INFO] Recompiling model using passed optimizer and loss arguments'
)
model.compile(optimizer=opt,
loss=loss_fn,
run_eagerly=run_eagerly)
callback_list = [range_finder, tensorboard_callback, stop_on_nan]
train_history = model.fit(train_dataset,
epochs=num_epochs,
callbacks=callback_list)
print(
'\n[INFO] Training complete. Range test results can be found at "./range_test_result.png"'
)
return
else:
lr_schedule = get_learning_rate_schedule(
schedule_name=lr_schedule_name,
learning_rate=init_lr,
max_lr=max_lr,
image_count=n_imgs,
batch_size=batch_size,
step_size=step_size)
opt = get_optimizer(optimizer_name=optimizer,
lr_schedule=lr_schedule,
weight_decay=weight_decay)
if not os.path.exists(checkpoint_path):
os.mkdir(checkpoint_path)
#checkpoint_name = checkpoint_path + '/' + 'cp-{epoch:03d}.ckpt'
model_saver = tf.keras.callbacks.ModelCheckpoint(
filepath=os.path.join(checkpoint_path, 'full_model'),
save_weights_only=False,
monitor='val_loss',
mode='min',
save_best_only=False,
save_freq=checkpoint_interval)
weights_saver = tf.keras.callbacks.ModelCheckpoint(
filepath=os.path.join(checkpoint_path, 'model_weights'),
save_weights_only=True,
monitor='val_loss',
mode='min',
save_best_only=False,
save_freq=checkpoint_interval)
if use_tpu is True:
with strategy.scope():
model, compiled = create_neural_network(
model_type=model_type,
embedding_size=embedding_size,
weights_path=weights_path,
n_classes=n_classes,
recompile=recompile,
input_shape=[crop_size, crop_size, 3],
training=True,
margin=margin,
logist_scale=logist_scale)
assert model is not None, '[ERROR] There was a problem in loading the pre-trained weights'
if compiled is False:
print(
'[INFO] Recompiling model using passed optimizer and loss arguments'
)
model.compile(optimizer=opt,
loss=loss_fn,
run_eagerly=run_eagerly)
elif distributed is True and use_tpu is False:
with mirrored_strategy.scope():
model, compiled = create_neural_network(
model_type=model_type,
embedding_size=embedding_size,
weights_path=weights_path,
n_classes=n_classes,
recompile=recompile,
input_shape=[crop_size, crop_size, 3],
training=True,
margin=margin,
logist_scale=logist_scale)
opt = get_optimizer(
optimizer_name=optimizer,
lr_schedule=lr_schedule,
weight_decay=weight_decay
) # Optimizer must be created within scope!
assert model is not None, '[ERROR] There was a problem in loading the pre-trained weights'
if compiled is False:
print(
'[INFO] Recompiling model using passed optimizer and loss arguments'
)
model.compile(optimizer=opt,
loss=loss_fn,
run_eagerly=run_eagerly)
else:
model, compiled = create_neural_network(
model_type=model_type,
embedding_size=embedding_size,
weights_path=weights_path,
n_classes=n_classes,
recompile=recompile,
input_shape=[crop_size, crop_size, 3],
training=True,
margin=margin,
logist_scale=logist_scale)
assert model is not None, '[ERROR] There was a problem in loading the pre-trained weights'
if compiled is False:
print(
'[INFO] Recompiling model using passed optimizer and loss arguments'
)
model.compile(optimizer=opt,
loss=loss_fn,
run_eagerly=run_eagerly)
callback_list = [
model_saver, weights_saver, tensorboard_callback, stop_on_nan
]
train_history = model.fit(
train_dataset,
epochs=num_epochs,
callbacks=callback_list,
steps_per_epoch=None if steps_per_epoch == 0 else steps_per_epoch)
if not os.path.exists('./results'):
os.mkdir('./results')
model_name = './results/model-' + datetime.now().strftime(
"%Y%m%d-%H%M%S")
model.save(model_name)
print(
'\n[INFO] Training complete. Saved model can be found in "./results"'
)
return
def get_quartznet(input_dim,
output_dim,
is_mixed_precision=False,
tflite_version=False,
num_b_block_repeats=3,
b_block_kernel_sizes=(33, 39, 51, 63, 75),
b_block_num_channels=(256, 256, 512, 512, 512),
num_small_blocks=5,
random_state=1) -> keras.Model:
"""
Parameters
----------
input_dim: input feature length
output_dim: output feature length
is_mixed_precision: if mixed precision model is needed
tflite_version: if export to tflite is needed
num_b_block_repeats: 1 is 5x5 quartznet, 2 is 10x5, 3 is 15x5
b_block_kernel_sizes: iterable, kernel size of each b block
b_block_num_channels: iterable, number of channels of each b block
"""
assert len(b_block_kernel_sizes) == len(b_block_num_channels), \
"Number of kernel sizes not equal the number of channel sizes"
max_seq_length = None
if tflite_version:
max_seq_length = 5
if is_mixed_precision:
policy = mixed_precision.Policy('mixed_float16')
mixed_precision.set_policy(policy)
np.random.seed(random_state)
tf.random.set_seed(random_state)
with tf.device('/cpu:0'):
input_tensor = layers.Input([max_seq_length, input_dim], name='X')
x = layers.Masking()(input_tensor)
# First encoder layer
x = layers.SeparableConv1D(256,
33,
padding='same',
strides=2,
name='conv_1',
use_bias=False)(x)
x = layers.BatchNormalization(name='BN-1', momentum=0.9)(x)
x = layers.ReLU(name='RELU-1')(x)
block_idx = 1
for kernel_size, n_channels in zip(b_block_kernel_sizes,
b_block_num_channels):
for bk in range(num_b_block_repeats):
x = B_block(kernel_size, n_channels, num_small_blocks,
f'B-{block_idx}')(x)
block_idx += 1
# First final layer
x = layers.SeparableConv1D(512,
87,
padding='same',
name='conv_2',
dilation_rate=2,
use_bias=False)(x)
x = layers.BatchNormalization(name='BN-2', momentum=0.9)(x)
x = layers.ReLU(name='RELU-2')(x)
# Second final layer
x = layers.Conv1D(1024,
1,
padding='same',
name='conv_3',
use_bias=False)(x)
x = layers.BatchNormalization(name='BN-3', momentum=0.9)(x)
x = layers.ReLU(name='RELU-3')(x)
# Third final layer
x = layers.Conv1D(output_dim,
1,
padding='same',
dilation_rate=1,
name='conv_4')(x)
model = keras.Model([input_tensor], x, name='QuartzNet')
if is_mixed_precision:
policy = mixed_precision.Policy('float32')
mixed_precision.set_policy(policy)
return model
def init_network(self):
# This function builds the compute graph.
# Optionally, it can build a 'subset' graph if this mode is
# Net construction:
start = time.time()
# Here, if using mixed precision, set a global policy:
if self.args.run.precision == "mixed":
from tensorflow.keras.mixed_precision import experimental as mixed_precision
self.policy = mixed_precision.Policy('mixed_float16')
mixed_precision.set_policy(self.policy)
if self.args.run.precision == "bfloat16":
from tensorflow.keras.mixed_precision import experimental as mixed_precision
self.policy = mixed_precision.Policy('mixed_bfloat16')
mixed_precision.set_policy(self.policy)
#
self._global_step = tf.Variable(0, dtype=tf.int64)
# Add the dataformat for the network construction:
# This sets up the necessary output shape:
output_shape = self.larcv_fetcher.output_shape('primary')
# Build the network object, forward pass only:
# To initialize the network, we see what the name is
# and act on that:
if self.args.network.name == "resnet":
if self.args.network.data_format == 'sparse':
raise Exception("No sparse networks available in tensorflow")
else:
if self.args.dataset.dimension == 2:
from src.networks.tensorflow import resnet
self._net = resnet.ResNet(output_shape, self.args)
else:
raise Exception("No Resnet3d Implemented!")
elif self.args.network.name == "pointnet":
if self.args.dataset.dimension == 2:
from src.networks.tensorflow import pointnet
self._net = pointnet.PointNet(output_shape, self.args)
else:
from src.networks.tensorflow import pointnet3d
self._net = pointnet3d.PointNet(output_shape, self.args)
elif self.args.network.name == "dgcnn":
from src.networks.tensorflow import dgcnn
self._net = dgcnn.DGCNN(output_shape, self.args)
else:
raise Exception(
f"Couldn't identify network {self.args.network.name}")
self._net.trainable = True
# TO PROPERLY INITIALIZE THE NETWORK, NEED TO DO A FORWARD PASS
minibatch_data = self.larcv_fetcher.fetch_next_batch("primary",
force_pop=False)
minibatch_data = self.cast_input(minibatch_data)
self.forward_pass(minibatch_data['image'], training=False)
end = time.time()
return end - start
def main(args, yaml_path, config):
tf.config.run_functions_eagerly(config['tensorflow']['eager'])
from tfmodel.data import Dataset
cds = config["dataset"]
dataset_def = Dataset(num_input_features=int(cds["num_input_features"]),
num_output_features=int(cds["num_output_features"]),
padded_num_elem_size=int(
cds["padded_num_elem_size"]),
raw_path=cds["raw_path"],
processed_path=cds["processed_path"],
validation_file_path=cds["validation_file_path"],
schema=cds["schema"])
if args.action == "data":
dataset_def.process(config["dataset"]["num_files_per_chunk"])
return
global_batch_size = config['setup']['batch_size']
model_name = os.path.splitext(os.path.basename(yaml_path))[0] + "-" + str(
uuid.uuid4())[:8]
print("model_name=", model_name)
tfr_files = sorted(glob.glob(dataset_def.processed_path))
if len(tfr_files) == 0:
raise Exception("Could not find any files in {}".format(
dataset_def.datapath))
dataset = tf.data.TFRecordDataset(tfr_files).map(
dataset_def.parse_tfr_element,
num_parallel_calls=tf.data.experimental.AUTOTUNE)
num_events = 0
for i in dataset:
num_events += 1
print("dataset loaded, len={}".format(num_events))
n_train = config['setup']['num_events_train']
n_test = config['setup']['num_events_test']
n_epochs = config['setup']['num_epochs']
weight_func = weight_functions[config['setup']['sample_weights']]
assert (n_train + n_test <= num_events)
ps = (tf.TensorShape(
[dataset_def.padded_num_elem_size, dataset_def.num_input_features]),
tf.TensorShape([
dataset_def.padded_num_elem_size, dataset_def.num_output_features
]), tf.TensorShape([
dataset_def.padded_num_elem_size,
]))
ds_train = dataset.take(n_train).map(weight_func).padded_batch(
global_batch_size, padded_shapes=ps)
ds_test = dataset.skip(n_train).take(n_test).map(weight_func).padded_batch(
global_batch_size, padded_shapes=ps)
#small test dataset used in the callback for making monitoring plots
X_test = ds_test.take(100).map(lambda x, y, w: x)
y_test = np.concatenate(
list(
ds_test.take(100).map(
lambda x, y, w: tf.concat(y, axis=-1)).as_numpy_iterator()))
ds_train_r = ds_train.repeat(n_epochs)
ds_test_r = ds_test.repeat(n_epochs)
weights = config['setup']['weights']
if args.weights:
weights = args.weights
if weights is None:
outdir = 'experiments/{}'.format(model_name)
if os.path.isdir(outdir):
print("Output directory exists: {}".format(outdir),
file=sys.stderr)
sys.exit(1)
else:
outdir = os.path.dirname(weights)
try:
num_gpus = len(os.environ.get("CUDA_VISIBLE_DEVICES", "0").split(","))
print("num_gpus=", num_gpus)
if num_gpus > 1:
strategy = tf.distribute.MirroredStrategy()
global_batch_size = num_gpus * global_batch_size
else:
strategy = tf.distribute.OneDeviceStrategy("gpu:0")
except Exception as e:
print("fallback to CPU", e)
strategy = tf.distribute.OneDeviceStrategy("cpu")
num_gpus = 0
actual_lr = global_batch_size * float(config['setup']['lr'])
Xs = []
ygens = []
ycands = []
#for faster loading
if args.action == "train":
dataset_def.val_filelist = dataset_def.val_filelist[:1]
for fi in dataset_def.val_filelist:
X, ygen, ycand = dataset_def.prepare_data(fi)
Xs.append(np.concatenate(X))
ygens.append(np.concatenate(ygen))
ycands.append(np.concatenate(ycand))
X_val = np.concatenate(Xs)
ygen_val = np.concatenate(ygens)
ycand_val = np.concatenate(ycands)
with strategy.scope():
if config['setup']['dtype'] == 'float16':
model_dtype = tf.dtypes.float16
from tensorflow.keras.mixed_precision import experimental as mixed_precision
policy = mixed_precision.Policy('mixed_float16')
mixed_precision.set_policy(policy)
opt = mixed_precision.LossScaleOptimizer(
tf.keras.optimizers.Adam(learning_rate=actual_lr),
loss_scale="dynamic")
else:
model_dtype = tf.dtypes.float32
opt = tf.keras.optimizers.Adam(learning_rate=actual_lr)
if args.action == "train" or args.action == "eval":
model = make_model(config, model_dtype)
loss_cls = PFNetLoss(
num_input_classes=config["dataset"]["num_input_classes"],
num_output_classes=config["dataset"]["num_output_classes"],
momentum_loss_coefs=config["dataset"]["momentum_loss_coefs"])
loss_fn = loss_cls.my_loss_full
if config["setup"]["trainable"] == "cls":
model.set_trainable_classification()
loss_fn = loss_cls.my_loss_cls
elif config["setup"]["trainable"] == "reg":
model.set_trainable_regression()
loss_fn = loss_cls.my_loss_reg
#we use the "temporal" mode to have per-particle weights
model.compile(loss=loss_fn,
optimizer=opt,
sample_weight_mode='temporal')
#Evaluate model once to build the layers
model(tf.cast(X_val[:1], model_dtype))
model.summary()
initial_epoch = 0
if weights:
model.load_weights(weights)
initial_epoch = int(weights.split("/")[-1].split("-")[1])
if args.action == "train":
file_writer_cm = tf.summary.create_file_writer(outdir +
'/val_extra')
callbacks = prepare_callbacks(
X_test, y_test, loss_cls, model, outdir,
config["dataset"]["num_input_classes"],
config["dataset"]["num_output_classes"], file_writer_cm)
model.fit(ds_train_r,
validation_data=ds_test_r,
epochs=initial_epoch + n_epochs,
callbacks=callbacks,
steps_per_epoch=n_train // global_batch_size,
validation_steps=n_test // global_batch_size,
initial_epoch=initial_epoch)
model.save(outdir + "/model_full", save_format="tf")
if args.action == "eval":
eval_model(X_val, ygen_val, ycand_val, model, config, outdir,
global_batch_size)
freeze_model(model, config, outdir)
if args.action == "time":
synthetic_timing_data = []
for iteration in range(config["timing"]["num_iter"]):
numev = config["timing"]["num_ev"]
for evsize in [
128 * 10, 128 * 20, 128 * 30, 128 * 40, 128 * 50,
128 * 60, 128 * 70, 128 * 80, 128 * 90, 128 * 100
]:
for batch_size in [1, 2, 3, 4]:
x = np.random.randn(
batch_size, evsize,
config["dataset"]["num_input_features"]).astype(
np.float32)
model = make_model(config, model_dtype)
model(x)
if weights:
model.load_weights(weights)
t0 = time.time()
for i in range(numev // batch_size):
model(x)
t1 = time.time()
dt = t1 - t0
time_per_event = 1000.0 * (dt / numev)
synthetic_timing_data.append([{
"iteration":
iteration,
"batch_size":
batch_size,
"event_size":
evsize,
"time_per_event":
time_per_event
}])
print(
"Synthetic random data: batch_size={} event_size={}, time={:.2f} ms/ev"
.format(batch_size, evsize, time_per_event))
with open("{}/synthetic_timing.json".format(outdir), "w") as fi:
json.dump(synthetic_timing_data, fi)
def train_ncnet(
model,
run_id=None,
multicoil=False,
three_d=False,
acq_type='radial',
scale_factor=1e6,
dcomp=False,
contrast=None,
cuda_visible_devices='0123',
n_samples=None,
n_epochs=200,
use_mixed_precision=False,
loss='mae',
original_run_id=None,
checkpoint_epoch=0,
save_state=False,
lr=1e-4,
**acq_kwargs,
):
# paths
n_volumes_train = n_volumes_train_fastmri
if multicoil:
train_path = f'{FASTMRI_DATA_DIR}multicoil_train/'
val_path = f'{FASTMRI_DATA_DIR}multicoil_val/'
elif three_d:
train_path = f'{OASIS_DATA_DIR}/train/'
val_path = f'{OASIS_DATA_DIR}/val/'
n_volumes_train = n_volumes_train_oasis
else:
train_path = f'{FASTMRI_DATA_DIR}singlecoil_train/singlecoil_train/'
val_path = f'{FASTMRI_DATA_DIR}singlecoil_val/'
os.environ["CUDA_VISIBLE_DEVICES"] = ','.join(cuda_visible_devices)
# trying mixed precision
if use_mixed_precision:
policy_type = 'mixed_float16'
else:
policy_type = 'float32'
policy = mixed_precision.Policy(policy_type)
mixed_precision.set_policy(policy)
# generators
if multicoil:
dataset = multicoil_dataset
image_size = IM_SIZE
elif three_d:
dataset = three_d_dataset
image_size = VOLUME_SIZE
else:
dataset = singlecoil_dataset
image_size = IM_SIZE
if not three_d:
add_kwargs = {
'contrast': contrast,
'rand': True,
'inner_slices': None,
}
else:
add_kwargs = {}
add_kwargs.update(**acq_kwargs)
train_set = dataset(train_path,
image_size,
acq_type=acq_type,
compute_dcomp=dcomp,
scale_factor=scale_factor,
n_samples=n_samples,
**add_kwargs)
val_set = dataset(val_path,
image_size,
acq_type=acq_type,
compute_dcomp=dcomp,
scale_factor=scale_factor,
**add_kwargs)
additional_info = f'{acq_type}'
if contrast is not None:
additional_info += f'_{contrast}'
if n_samples is not None:
additional_info += f'_{n_samples}'
if loss != 'mae':
additional_info += f'_{loss}'
if dcomp:
additional_info += '_dcomp'
if checkpoint_epoch == 0:
run_id = f'{run_id}_{additional_info}_{int(time.time())}'
else:
run_id = original_run_id
final_epoch = checkpoint_epoch + n_epochs
chkpt_path = f'{CHECKPOINTS_DIR}checkpoints/{run_id}' + '-{epoch:02d}.hdf5'
log_dir = op.join(f'{LOGS_DIR}logs', run_id)
tboard_cback = TensorBoard(
profile_batch=0,
log_dir=log_dir,
histogram_freq=0,
write_graph=False,
write_images=False,
)
tqdm_cback = TQDMProgressBar()
n_steps = n_volumes_train
chkpt_cback = ModelCheckpointWorkAround(
chkpt_path,
save_freq=int(n_epochs * n_steps),
save_weights_only=True,
)
default_model_compile(model, lr=lr, loss=loss)
# first run of the model to avoid the saving error
# ValueError: as_list() is not defined on an unknown TensorShape.
# it can also allow loading of weights
model(next(iter(train_set))[0])
if not checkpoint_epoch == 0:
model.load_weights(
f'{CHECKPOINTS_DIR}checkpoints/{original_run_id}-{checkpoint_epoch:02d}.hdf5'
)
grad_vars = model.trainable_weights
zero_grads = [tf.zeros_like(w) for w in grad_vars]
model.optimizer.apply_gradients(zip(zero_grads, grad_vars))
with open(
f'{CHECKPOINTS_DIR}checkpoints/{original_run_id}-optimizer.pkl',
'rb') as f:
weight_values = pickle.load(f)
model.optimizer.set_weights(weight_values)
print(run_id)
model.fit(
train_set,
steps_per_epoch=n_steps,
initial_epoch=checkpoint_epoch,
epochs=final_epoch,
validation_data=val_set,
validation_steps=2,
verbose=0,
callbacks=[tboard_cback, chkpt_cback, tqdm_cback],
)
if save_state:
symbolic_weights = getattr(model.optimizer, 'weights')
weight_values = K.batch_get_value(symbolic_weights)
with open(f'{CHECKPOINTS_DIR}checkpoints/{run_id}-optimizer.pkl',
'wb') as f:
pickle.dump(weight_values, f)
return run_id
def main(argv):
# set fixed random seed, load config files
tf.random.set_seed(RANDOM_SEED)
# using mix precision or not
if MIXPRECISION:
policy = mixed_precision.Policy('mixed_float16')
mixed_precision.set_policy(policy)
# get params for model
train_iter, input_size, num_cls, lrs_schedule_params, loss_params, parser_params, model_params = get_params(
FLAGS.name)
# -----------------------------------------------------------------
# set up Grappler for graph optimization
# Ref: https://www.tensorflow.org/guide/graph_optimization
@contextlib.contextmanager
def options(opts):
old_opts = tf.config.optimizer.get_experimental_options()
tf.config.optimizer.set_experimental_options(opts)
try:
yield
finally:
tf.config.optimizer.set_experimental_options(old_opts)
# -----------------------------------------------------------------
# Creating the instance of the model specified.
logging.info("Creating the model instance of YOLACT")
model = Yolact(**model_params)
# add weight decay
for layer in model.layers:
if isinstance(layer, tf.keras.layers.Conv2D) or isinstance(
layer, tf.keras.layers.Dense):
layer.add_loss(lambda: tf.keras.regularizers.l2(FLAGS.weight_decay)
(layer.kernel))
if hasattr(layer, 'bias_regularizer') and layer.use_bias:
layer.add_loss(lambda: tf.keras.regularizers.l2(FLAGS.weight_decay)
(layer.bias))
# -----------------------------------------------------------------
# Creating dataloaders for training and validation
logging.info("Creating the dataloader from: %s..." % FLAGS.tfrecord_dir)
dateset = ObjectDetectionDataset(dataset_name=FLAGS.name,
tfrecord_dir=os.path.join(
FLAGS.tfrecord_dir, FLAGS.name),
anchor_instance=model.anchor_instance,
**parser_params)
train_dataset = dateset.get_dataloader(subset='train',
batch_size=FLAGS.batch_size)
valid_dataset = dateset.get_dataloader(subset='val', batch_size=1)
# count number of valid data for progress bar
# Todo any better way to do it?
num_val = 0
for _ in valid_dataset:
num_val += 1
# -----------------------------------------------------------------
# Choose the Optimizor, Loss Function, and Metrics, learning rate schedule
lr_schedule = learning_rate_schedule.Yolact_LearningRateSchedule(
**lrs_schedule_params)
logging.info("Initiate the Optimizer and Loss function...")
optimizer = tf.keras.optimizers.SGD(learning_rate=lr_schedule,
momentum=FLAGS.momentum)
criterion = loss_yolact.YOLACTLoss(**loss_params)
train_loss = tf.keras.metrics.Mean('train_loss', dtype=tf.float32)
loc = tf.keras.metrics.Mean('loc_loss', dtype=tf.float32)
conf = tf.keras.metrics.Mean('conf_loss', dtype=tf.float32)
mask = tf.keras.metrics.Mean('mask_loss', dtype=tf.float32)
seg = tf.keras.metrics.Mean('seg_loss', dtype=tf.float32)
# -----------------------------------------------------------------
# Setup the TensorBoard for better visualization
# Ref: https://www.tensorflow.org/tensorboard/get_started
logging.info("Setup the TensorBoard...")
current_time = datetime.datetime.now().strftime("%Y%m%d-%H%M%S")
train_log_dir = './logs/gradient_tape/' + current_time + '/train'
test_log_dir = './logs/gradient_tape/' + current_time + '/test'
train_summary_writer = tf.summary.create_file_writer(train_log_dir)
test_summary_writer = tf.summary.create_file_writer(test_log_dir)
# -----------------------------------------------------------------
# Start the Training and Validation Process
logging.info("Start the training process...")
# setup checkpoints manager
checkpoint = tf.train.Checkpoint(step=tf.Variable(1),
optimizer=optimizer,
model=model)
manager = tf.train.CheckpointManager(checkpoint,
directory="./checkpoints",
max_to_keep=5)
# restore from latest checkpoint and iteration
status = checkpoint.restore(manager.latest_checkpoint)
if manager.latest_checkpoint:
logging.info("Restored from {}".format(manager.latest_checkpoint))
else:
logging.info("Initializing from scratch.")
best_masks_map = 0.
iterations = checkpoint.step.numpy()
for image, labels in train_dataset:
# check iteration and change the learning rate
if iterations > train_iter:
break
checkpoint.step.assign_add(1)
iterations += 1
with options({
'constant_folding': True,
'layout_optimize': True,
'loop_optimization': True,
'arithmetic_optimization': True,
'remapping': True
}):
loc_loss, conf_loss, mask_loss, seg_loss = train_step(
model, criterion, train_loss, optimizer, image, labels,
num_cls)
loc.update_state(loc_loss)
conf.update_state(conf_loss)
mask.update_state(mask_loss)
seg.update_state(seg_loss)
with train_summary_writer.as_default():
tf.summary.scalar('Total loss',
train_loss.result(),
step=iterations)
tf.summary.scalar('Loc loss', loc.result(), step=iterations)
tf.summary.scalar('Conf loss', conf.result(), step=iterations)
tf.summary.scalar('Mask loss', mask.result(), step=iterations)
tf.summary.scalar('Seg loss', seg.result(), step=iterations)
if iterations and iterations % FLAGS.print_interval == 0:
tf.print(
"Iteration {}, LR: {}, Total Loss: {}, B: {}, C: {}, M: {}, S:{} "
.format(iterations,
optimizer._decayed_lr(var_dtype=tf.float32),
train_loss.result(), loc.result(), conf.result(),
mask.result(), seg.result()))
if iterations and iterations % FLAGS.save_interval == 0:
# save checkpoint
save_path = manager.save()
logging.info("Saved checkpoint for step {}: {}".format(
int(checkpoint.step), save_path))
# validation and print mAP table
all_map = evaluate(model, valid_dataset, num_val, num_cls)
box_map, mask_map = all_map['box']['all'], all_map['mask']['all']
tf.print(f"box mAP:{box_map}, mask mAP:{mask_map}")
with test_summary_writer.as_default():
tf.summary.scalar('Box mAP', box_map, step=iterations)
tf.summary.scalar('Mask mAP', mask_map, step=iterations)
# Saving the weights:
if mask_map > best_masks_map:
best_masks_map = mask_map
model.save_weights(
f'{FLAGS.weights}/weights_{FLAGS.name}_{str(best_masks_map)}.h5'
)
# reset the metrics
train_loss.reset_states()
loc.reset_states()
conf.reset_states()
mask.reset_states()
seg.reset_states()
def main():
configs = yaml.safe_load((
pathlib.Path(sys.argv[0]).parent / 'configs.yaml').read_text())
parsed, remaining = common.Flags(configs=['defaults']).parse(known_only=True)
config = common.Config(configs['defaults'])
for name in parsed.configs:
config = config.update(configs[name])
config = common.Flags(config).parse(remaining)
logdir = pathlib.Path(config.logdir).expanduser()
logdir.mkdir(parents=True, exist_ok=True)
config.save(logdir / 'config.yaml')
print(config, '\n')
print('Logdir', logdir)
import tensorflow as tf
tf.config.experimental_run_functions_eagerly(not config.jit)
message = 'No GPU found. To actually train on CPU remove this assert.'
assert tf.config.experimental.list_physical_devices('GPU'), message
for gpu in tf.config.experimental.list_physical_devices('GPU'):
tf.config.experimental.set_memory_growth(gpu, True)
assert config.precision in (16, 32), config.precision
if config.precision == 16:
from tensorflow.keras.mixed_precision import experimental as prec
prec.set_policy(prec.Policy('mixed_float16'))
train_replay = common.Replay(logdir / 'train_episodes', **config.replay)
eval_replay = common.Replay(logdir / 'eval_episodes', **dict(
capacity=config.replay.capacity // 10,
minlen=config.dataset.length,
maxlen=config.dataset.length))
step = common.Counter(train_replay.stats['total_steps'])
outputs = [
common.TerminalOutput(),
common.JSONLOutput(logdir),
common.TensorBoardOutput(logdir),
]
logger = common.Logger(step, outputs, multiplier=config.action_repeat)
metrics = collections.defaultdict(list)
should_train = common.Every(config.train_every)
should_log = common.Every(config.log_every)
should_video_train = common.Every(config.eval_every)
should_video_eval = common.Every(config.eval_every)
should_expl = common.Until(config.expl_until // config.action_repeat)
def make_env(mode):
suite, task = config.task.split('_', 1)
if suite == 'dmc':
env = common.DMC(
task, config.action_repeat, config.render_size, config.dmc_camera)
env = common.NormalizeAction(env)
elif suite == 'atari':
env = common.Atari(
task, config.action_repeat, config.render_size,
config.atari_grayscale)
env = common.OneHotAction(env)
elif suite == 'crafter':
assert config.action_repeat == 1
outdir = logdir / 'crafter' if mode == 'train' else None
reward = bool(['noreward', 'reward'].index(task)) or mode == 'eval'
env = common.Crafter(outdir, reward)
env = common.OneHotAction(env)
else:
raise NotImplementedError(suite)
env = common.TimeLimit(env, config.time_limit)
return env
def per_episode(ep, mode):
length = len(ep['reward']) - 1
score = float(ep['reward'].astype(np.float64).sum())
print(f'{mode.title()} episode has {length} steps and return {score:.1f}.')
logger.scalar(f'{mode}_return', score)
logger.scalar(f'{mode}_length', length)
for key, value in ep.items():
if re.match(config.log_keys_sum, key):
logger.scalar(f'sum_{mode}_{key}', ep[key].sum())
if re.match(config.log_keys_mean, key):
logger.scalar(f'mean_{mode}_{key}', ep[key].mean())
if re.match(config.log_keys_max, key):
logger.scalar(f'max_{mode}_{key}', ep[key].max(0).mean())
should = {'train': should_video_train, 'eval': should_video_eval}[mode]
if should(step):
for key in config.log_keys_video:
logger.video(f'{mode}_policy_{key}', ep[key])
replay = dict(train=train_replay, eval=eval_replay)[mode]
logger.add(replay.stats, prefix=mode)
logger.write()
print('Create envs.')
num_eval_envs = min(config.envs, config.eval_eps)
if config.envs_parallel == 'none':
train_envs = [make_env('train') for _ in range(config.envs)]
eval_envs = [make_env('eval') for _ in range(num_eval_envs)]
else:
make_async_env = lambda mode: common.Async(
functools.partial(make_env, mode), config.envs_parallel)
train_envs = [make_async_env('train') for _ in range(config.envs)]
eval_envs = [make_async_env('eval') for _ in range(eval_envs)]
act_space = train_envs[0].act_space
obs_space = train_envs[0].obs_space
train_driver = common.Driver(train_envs)
train_driver.on_episode(lambda ep: per_episode(ep, mode='train'))
train_driver.on_step(lambda tran, worker: step.increment())
train_driver.on_step(train_replay.add_step)
train_driver.on_reset(train_replay.add_step)
eval_driver = common.Driver(eval_envs)
eval_driver.on_episode(lambda ep: per_episode(ep, mode='eval'))
eval_driver.on_episode(eval_replay.add_episode)
prefill = max(0, config.prefill - train_replay.stats['total_steps'])
if prefill:
print(f'Prefill dataset ({prefill} steps).')
random_agent = common.RandomAgent(act_space)
train_driver(random_agent, steps=prefill, episodes=1)
eval_driver(random_agent, episodes=1)
train_driver.reset()
eval_driver.reset()
print('Create agent.')
train_dataset = iter(train_replay.dataset(**config.dataset))
report_dataset = iter(train_replay.dataset(**config.dataset))
eval_dataset = iter(eval_replay.dataset(**config.dataset))
agnt = agent.Agent(config, obs_space, act_space, step)
train_agent = common.CarryOverState(agnt.train)
train_agent(next(train_dataset))
if (logdir / 'variables.pkl').exists():
agnt.load(logdir / 'variables.pkl')
else:
print('Pretrain agent.')
for _ in range(config.pretrain):
train_agent(next(train_dataset))
train_policy = lambda *args: agnt.policy(
*args, mode='explore' if should_expl(step) else 'train')
eval_policy = lambda *args: agnt.policy(*args, mode='eval')
def train_step(tran, worker):
if should_train(step):
for _ in range(config.train_steps):
mets = train_agent(next(train_dataset))
[metrics[key].append(value) for key, value in mets.items()]
if should_log(step):
for name, values in metrics.items():
logger.scalar(name, np.array(values, np.float64).mean())
metrics[name].clear()
logger.add(agnt.report(next(report_dataset)), prefix='train')
logger.write(fps=True)
train_driver.on_step(train_step)
while step < config.steps:
logger.write()
print('Start evaluation.')
logger.add(agnt.report(next(eval_dataset)), prefix='eval')
eval_driver(eval_policy, episodes=config.eval_eps)
print('Start training.')
train_driver(train_policy, steps=config.eval_every)
agnt.save(logdir / 'variables.pkl')
for env in train_envs + eval_envs:
try:
env.close()
except Exception:
pass
def train(strategy, cfg):
os.makedirs(cfg.MODEL.SAVE_DIR, exist_ok=True)
if cfg.DATASET.BFLOAT16:
policy = mixed_precision.Policy('mixed_bfloat16')
mixed_precision.set_policy(policy)
tf.random.set_seed(cfg.TRAIN.SEED)
np.random.seed(cfg.TRAIN.SEED)
meta_data = {'train_loss': [], 'val_loss': [], 'config': cfg}
spe = int(np.ceil(cfg.DATASET.TRAIN_SAMPLES / cfg.TRAIN.BATCH_SIZE))
spv = cfg.DATASET.VAL_SAMPLES // cfg.VAL.BATCH_SIZE
if cfg.TRAIN.SCALE_LR:
lr = cfg.TRAIN.BASE_LR * cfg.TRAIN.BATCH_SIZE / 32
cfg.TRAIN.WARMUP_FACTOR = 32 / cfg.TRAIN.BATCH_SIZE
else:
lr = cfg.TRAIN.BASE_LR
if cfg.TRAIN.LR_SCHEDULE == 'warmup_cosine_decay':
lr_schedule = WarmupCosineDecay(initial_learning_rate=lr,
decay_steps=cfg.TRAIN.EPOCHS * spe,
warmup_steps=cfg.TRAIN.WARMUP_EPOCHS *
spe,
warmup_factor=cfg.TRAIN.WARMUP_FACTOR)
elif cfg.TRAIN.LR_SCHEDULE == 'warmup_piecewise':
lr_schedule = WarmupPiecewise(
boundaries=[x * spe for x in cfg.TRAIN.DECAY_EPOCHS],
values=[lr, lr / 10, lr / 10**2],
warmup_steps=spe * cfg.TRAIN.WARMUP_EPOCHS,
warmup_factor=cfg.TRAIN.WARMUP_FACTOR)
else:
lr_schedule = lr
with strategy.scope():
optimizer = tf.keras.optimizers.Adam(lr_schedule)
if cfg.MODEL.TYPE == 'simple_baseline':
model = SimpleBaseline(cfg)
elif cfg.MODEL.TYPE == 'hrnet':
model = HRNet(cfg)
elif cfg.MODEL.TYPE == 'evopose':
model = EvoPose(cfg)
train_loss = tf.keras.metrics.Mean()
val_loss = tf.keras.metrics.Mean()
cfg.DATASET.OUTPUT_SHAPE = model.output_shape[1:]
cfg.DATASET.SIGMA = 2 * cfg.DATASET.OUTPUT_SHAPE[0] / 64
meta_data['parameters'] = model.count_params()
meta_data['flops'] = get_flops(model)
train_ds = load_tfds(cfg, 'train')
train_ds = strategy.experimental_distribute_dataset(train_ds)
train_iterator = iter(train_ds)
if cfg.TRAIN.VAL:
val_ds = load_tfds(cfg, 'val')
val_ds = strategy.experimental_distribute_dataset(val_ds)
@tf.function
def train_step(train_iterator):
def step_fn(inputs):
imgs, targets, valid = inputs
with tf.GradientTape() as tape:
loss, l2_loss = mse_loss(model,
imgs,
targets,
valid,
training=True)
scaled_loss = (loss + l2_loss) / strategy.num_replicas_in_sync
grads = tape.gradient(scaled_loss, model.trainable_variables)
optimizer.apply_gradients(
list(zip(grads, model.trainable_variables)))
train_loss.update_state(loss)
strategy.run(step_fn, args=(next(train_iterator), ))
@tf.function
def val_step(dist_inputs):
def step_fn(inputs):
imgs, targets, valid = inputs
loss, _ = mse_loss(model, imgs, targets, valid, training=False)
val_loss.update_state(loss)
strategy.run(step_fn, args=(dist_inputs, ))
print('Training {} ({:.2f}M / {:.2f}G) on {} for {} epochs'.format(
cfg.MODEL.NAME, meta_data['parameters'] / 1e6,
meta_data['flops'] / 2 / 1e9, cfg.TRAIN.ACCELERATOR, cfg.TRAIN.EPOCHS))
epoch = 1
ts = time()
while epoch <= cfg.TRAIN.EPOCHS:
te = time()
for i in range(spe):
train_step(train_iterator)
if cfg.TRAIN.DISP:
print('epoch {} ({}/{}) | loss: {:.1f}'.format(
epoch, i + 1, spe,
train_loss.result().numpy()))
meta_data['train_loss'].append(train_loss.result().numpy())
if cfg.TRAIN.VAL:
for i, batch in enumerate(val_ds):
val_step(batch)
if cfg.TRAIN.DISP:
print('val {} ({}/{}) | loss: {:.1f}'.format(
epoch, i + 1, spv,
val_loss.result().numpy()))
meta_data['val_loss'].append(val_loss.result().numpy())
if cfg.VAL.SAVE_BEST:
if epoch == 1:
best_weights = model.get_weights()
best_loss = val_loss.result().numpy()
if cfg.TRAIN.DISP:
print('Cached model weights')
elif val_loss.result().numpy() < best_loss:
best_weights = model.get_weights()
best_loss = val_loss.result().numpy()
if cfg.TRAIN.DISP:
print('Cached model weights')
train_loss.reset_states()
val_loss.reset_states()
if cfg.TRAIN.SAVE_EPOCHS and epoch % cfg.TRAIN.SAVE_EPOCHS == 0:
model.save(osp.join(
cfg.MODEL.SAVE_DIR,
'{}_ckpt{:03d}.h5'.format(cfg.MODEL.NAME, epoch)),
save_format='h5')
print(
'Saved checkpoint to',
osp.join(cfg.MODEL.SAVE_DIR,
'{}_ckpt{:03d}.h5'.format(cfg.MODEL.NAME, epoch)))
if cfg.TRAIN.SAVE_META:
pickle.dump(
meta_data,
open(
osp.join(cfg.MODEL.SAVE_DIR,
'{}_meta.pkl'.format(cfg.MODEL.NAME)), 'wb'))
if epoch > 1 and cfg.TRAIN.DISP:
est_time = (cfg.TRAIN.EPOCHS - epoch) * (time() - te) / 3600
print('Estimated time remaining: {:.2f} hrs'.format(est_time))
epoch += 1
meta_data['training_time'] = time() - ts
if cfg.VAL.SAVE_BEST:
model.set_weights(best_weights)
return model, meta_data
def init_network(self):
# This function builds the compute graph.
# Optionally, it can build a 'subset' graph if this mode is
# Net construction:
start = time.time()
# Here, if using mixed precision, set a global policy:
if self.args.precision == "mixed":
from tensorflow.keras.mixed_precision import experimental as mixed_precision
self.policy = mixed_precision.Policy('mixed_float16')
mixed_precision.set_policy(self.policy)
batch_dims = self.larcv_fetcher.batch_dims(1)
# We compute the
batch_dims[0] = self.local_batch_size()
# We have to make placeholders for input objects:
self._input = {
'image':
tf.compat.v1.placeholder(floating_point_format,
batch_dims,
name="input_image"),
'label':
tf.compat.v1.placeholder(integer_format,
batch_dims,
name="input_label"),
'io_time':
tf.compat.v1.placeholder(floating_point_format, (),
name="io_fetch_time")
}
# Build the network object, forward pass only:
if self.args.conv_mode == '2D':
self._net = uresnet2D.UResNet(self.args)
else:
self._net = uresnet3D.UResNet3D(self.args)
self._net.trainable = True
self._logits = self._net(self._input['image'],
training=self.args.training)
# If channels first, need to permute the logits:
if self._channels_dim == 1:
permutation = tf.keras.layers.Permute((2, 3, 1))
self._loss_logits = [permutation(l) for l in self._logits]
else:
self._loss_logits = self._logits
# Used to accumulate gradients over several iterations:
with tf.compat.v1.variable_scope("gradient_accumulation"):
self._accum_vars = [
tf.Variable(tv.initialized_value(), trainable=False)
for tv in tf.compat.v1.trainable_variables()
]
if self.args.mode == "train" or self.args.mode == "inference":
# Here, if the data format is channels_first, we have to reorder the logits tensors
# To put channels last. Otherwise it does not work with the softmax tensors.
# Apply a softmax and argmax:
self._output = dict()
# Take the logits (which are one per plane) and create a softmax and prediction (one per plane)
with tf.compat.v1.variable_scope("prediction"):
self._output['prediction'] = [
tf.argmax(x, axis=self._channels_dim) for x in self._logits
]
with tf.compat.v1.variable_scope("cross_entropy"):
self.loss_calculator = LossCalculator.LossCalculator(
self.args.loss_balance_scheme, self._channels_dim)
self._input['split_labels'] = [
tf.squeeze(l, axis=self._channels_dim) for l in tf.split(
self._input['label'], 3, self._channels_dim)
]
self._input['split_images'] = [
tf.squeeze(l, axis=self._channels_dim) for l in tf.split(
self._input['image'], 3, self._channels_dim)
]
self._loss = self.loss_calculator(
labels=self._input['split_labels'],
logits=self._loss_logits)
if self.args.mode == "inference":
self._output['softmax'] = [
tf.nn.softmax(x, axis=self._channels_dim)
for x in self._logits
]
self._accuracy_calc = AccuracyCalculator.AccuracyCalculator()
self._accuracy = self._accuracy_calc(
prediction=self._output['prediction'],
labels=self._input['split_labels'])
# Add the metrics by hand:
self._metrics = {}
for p in [0, 1, 2]:
self._metrics[f"plane{p}/Total_Accuracy"] = self._accuracy[
"total_accuracy"][p]
self._metrics[f"plane{p}/Non_Bkg_Accuracy"] = self._accuracy[
"non_bkg_accuracy"][p]
self._metrics[f"plane{p}/Neutrino_IoU"] = self._accuracy[
"neut_iou"][p]
self._metrics[f"plane{p}/Cosmic_IoU"] = self._accuracy[
"cosmic_iou"][p]
self._metrics[f"plane{p}/mIoU"] = self._accuracy["miou"][p]
with tf.compat.v1.variable_scope("accuracy"):
self._metrics["Average/Total_Accuracy"] = tf.reduce_mean(
self._accuracy["total_accuracy"])
self._metrics["Average/Non_Bkg_Accuracy"] = tf.reduce_mean(
self._accuracy["non_bkg_accuracy"])
self._metrics["Average/Neutrino_IoU"] = tf.reduce_mean(
self._accuracy["neut_iou"])
self._metrics["Average/Cosmic_IoU"] = tf.reduce_mean(
self._accuracy["cosmic_iou"])
self._metrics["Average/mIoU"] = tf.reduce_mean(
self._accuracy["miou"])
self._metrics['loss'] = self._loss
self._log_keys = ["loss", "Average/Non_Bkg_Accuracy", "Average/mIoU"]
end = time.time()
return end - start
def train_ncnet(
model,
run_id=None,
multicoil=False,
three_d=False,
acq_type='radial',
scale_factor=1e6,
dcomp=False,
contrast=None,
cuda_visible_devices='0123',
n_samples=None,
n_epochs=200,
use_mixed_precision=False,
loss='mae',
original_run_id=None,
**acq_kwargs,
):
# paths
n_volumes_train = n_volumes_train_fastmri
if multicoil:
train_path = f'{FASTMRI_DATA_DIR}multicoil_train/'
val_path = f'{FASTMRI_DATA_DIR}multicoil_val/'
elif three_d:
train_path = f'{OASIS_DATA_DIR}/train/'
val_path = f'{OASIS_DATA_DIR}/val/'
n_volumes_train = n_volumes_train_oasis
else:
train_path = f'{FASTMRI_DATA_DIR}singlecoil_train/singlecoil_train/'
val_path = f'{FASTMRI_DATA_DIR}singlecoil_val/'
os.environ["CUDA_VISIBLE_DEVICES"] = ','.join(cuda_visible_devices)
# trying mixed precision
if use_mixed_precision:
policy_type = 'mixed_float16'
else:
policy_type = 'float32'
policy = mixed_precision.Policy(policy_type)
mixed_precision.set_policy(policy)
# generators
if multicoil:
dataset = multicoil_dataset
image_size = IM_SIZE
elif three_d:
dataset = three_d_dataset
image_size = VOLUME_SIZE
else:
dataset = singlecoil_dataset
image_size = IM_SIZE
if not three_d:
add_kwargs = {
'contrast': contrast,
'rand': True,
'inner_slices': None,
}
else:
add_kwargs = {}
add_kwargs.update(**acq_kwargs)
train_set = dataset(
train_path,
image_size,
acq_type=acq_type,
compute_dcomp=dcomp,
scale_factor=scale_factor,
n_samples=n_samples,
**add_kwargs
)
val_set = dataset(
val_path,
image_size,
acq_type=acq_type,
compute_dcomp=dcomp,
scale_factor=scale_factor,
**add_kwargs
)
additional_info = f'{acq_type}'
if contrast is not None:
additional_info += f'_{contrast}'
if n_samples is not None:
additional_info += f'_{n_samples}'
if loss != 'mae':
additional_info += f'_{loss}'
if dcomp:
additional_info += '_dcomp'
run_id = f'{run_id}_{additional_info}_{int(time.time())}'
chkpt_path = f'{CHECKPOINTS_DIR}checkpoints/{run_id}' + '-{epoch:02d}.hdf5'
chkpt_cback = ModelCheckpoint(chkpt_path, period=n_epochs, save_weights_only=True)
log_dir = op.join(f'{LOGS_DIR}logs', run_id)
tboard_cback = TensorBoard(
profile_batch=0,
log_dir=log_dir,
histogram_freq=0,
write_graph=False,
write_images=False,
)
tqdm_cback = TQDMProgressBar()
if original_run_id is not None:
lr = 1e-7
n_steps = n_volumes_train//2
else:
lr = 1e-4
n_steps = n_volumes_train
default_model_compile(model, lr=lr, loss=loss)
print(run_id)
if original_run_id is not None:
if os.environ.get('FASTMRI_DEBUG'):
n_epochs_original = 1
else:
n_epochs_original = 250
model.load_weights(f'{CHECKPOINTS_DIR}checkpoints/{original_run_id}-{n_epochs_original:02d}.hdf5')
model.fit(
train_set,
steps_per_epoch=n_steps,
epochs=n_epochs,
validation_data=val_set,
validation_steps=2,
verbose=0,
callbacks=[tboard_cback, chkpt_cback, tqdm_cback],
)
return run_id
def __init__(
self,
seq_len,
vocab_size,
embedding_dim=20,
hidden_dim=256,
n_hidden=2,
dff=512,
n_epochs=1,
batch_size=1000,
inference_batch_size=1500,
cache_dir='.',
model_name='bilstm',
seed=None,
verbose=False
):
super().__init__(seed=seed,)
policy = mixed_precision.Policy('mixed_float16')
mixed_precision.set_policy(policy)
mirrored_strategy = tf.distribute.MirroredStrategy()
print('Number of devices: {}'.format(mirrored_strategy.num_replicas_in_sync))
with mirrored_strategy.scope():
input_pre = Input(shape=(seq_len - 1,))
input_post = Input(shape=(seq_len - 1,))
embed = Embedding(vocab_size + 1, embedding_dim,
input_length=seq_len - 1)
x_pre = embed(input_pre)
x_post = embed(input_post)
for _ in range(n_hidden - 1):
lstm = LSTM(hidden_dim, return_sequences=True)
x_pre = lstm(x_pre)
x_post = lstm(x_post)
lstm = LSTM(hidden_dim)
x_pre = lstm(x_pre)
x_post = lstm(x_post)
x = concatenate([ x_pre, x_post ],
name='embed_layer')
#x = Dense(dff, activation='relu')(x)
x = Dense(vocab_size + 1)(x)
output = Activation('softmax', dtype='float32')(x)
self.model_ = Model(inputs=[ input_pre, input_post ],
outputs=output)
opt = Adam(learning_rate=0.001, beta_1=0.9, beta_2=0.999,
amsgrad=False)
self.model_.compile(
loss='sparse_categorical_crossentropy', optimizer=opt,
metrics=['accuracy']
)
self.seq_len_ = seq_len
self.vocab_size_ = vocab_size
self.embedding_dim_ = embedding_dim
self.hidden_dim_ = hidden_dim
self.n_hidden_ = n_hidden
self.dff_ = dff
self.n_epochs_ = n_epochs
self.batch_size_ = batch_size
self.inference_batch_size_ = inference_batch_size
self.cache_dir_ = cache_dir
self.model_name_ = model_name
self.verbose_ = verbose
def run_training(
encoder_f,
box_f,
lr_f,
name,
epochs,
batch_size,
steps_per_epoch,
img,
data,
val_data,
img_size,
mixed_float=True,
notebook=True,
):
"""
val_data : (X_val, Y_val) tuple
"""
if mixed_float:
policy = mixed_precision.Policy('mixed_float16')
mixed_precision.set_policy(policy)
st = time.time()
inputs = {
'image': keras.Input((img_size[0], img_size[1], 3)),
'pos': keras.Input((2))
}
mymodel = BoxModel(inputs, encoder_f, box_f)
loss = keras.losses.MeanSquaredError()
mymodel.compile(
optimizer='adam',
loss=loss,
# metrics=[
# 'mse',
# ]
)
logdir = 'logs/fit/' + name
tensorboard_callback = tf.keras.callbacks.TensorBoard(log_dir=logdir,
histogram_freq=1,
profile_batch='3,5',
update_freq='epoch')
lr_callback = keras.callbacks.LearningRateScheduler(lr_f, verbose=1)
savedir = 'savedmodels/' + name + '/{epoch}'
save_callback = keras.callbacks.ModelCheckpoint(savedir,
save_weights_only=True,
verbose=1)
if notebook:
tqdm_callback = TqdmNotebookCallback(
metrics=['loss', 'binary_accuracy'], leave_inner=False)
else:
tqdm_callback = TqdmCallback()
# if augment:
train_ds = create_train_dataset(img, data, img_size, batch_size)
mymodel.fit(
x=train_ds,
epochs=epochs,
steps_per_epoch=steps_per_epoch,
validation_data=val_data,
callbacks=[
tensorboard_callback,
lr_callback,
save_callback,
tqdm_callback,
],
verbose=0,
# validation_data=val_data,
)
# else:
# mymodel.fit(
# x=X_train,
# y=Y_train,
# epochs=epochs,
# batch_size=batch_size,
# callbacks=[
# tensorboard_callback,
# lr_callback,
# save_callback,
# tqdm_callback,
# ],
# verbose=0,
# validation_data=val_data
# )
print('Took {} seconds'.format(time.time() - st))
def __init__(
self,
seq_len,
vocab_size,
embedding_dim=20,
hidden_dim=256,
n_hidden=2,
n_heads=8,
dff=2048,
dropout_rate=0.1,
n_epochs=1,
batch_size=1000,
cache_dir='.',
model_name='attention',
seed=None,
verbose=False
):
super().__init__(seed=seed,)
policy = mixed_precision.Policy('mixed_float16')
mixed_precision.set_policy(policy)
mirrored_strategy = tf.distribute.MirroredStrategy()
print('Number of devices: {}'.format(mirrored_strategy.num_replicas_in_sync))
with mirrored_strategy.scope():
input_ = Input(shape=(seq_len - 1,))
from transformer_layers import Encoder
self.encoder_ = Encoder(
n_hidden, hidden_dim, n_heads, dff,
vocab_size + 1, seq_len, dropout_rate,
name='embed_layer',
)
x = self.encoder_(input_, None)
x = Reshape((hidden_dim * (seq_len - 1),))(x)
#x = Dense(dff, activation='relu')(x)
x = Dense(vocab_size + 1)(x)
output = Activation('softmax', dtype='float32')(x)
self.model_ = Model(inputs=input_, outputs=output)
opt = Adam(learning_rate=0.001, beta_1=0.9, beta_2=0.999,
amsgrad=False)
self.model_.compile(
loss='sparse_categorical_crossentropy', optimizer=opt,
metrics=['accuracy']
)
self.seq_len_ = seq_len
self.vocab_size_ = vocab_size
self.embedding_dim_ = embedding_dim
self.hidden_dim_ = hidden_dim
self.n_hidden_ = n_hidden
self.n_heads_ = n_heads
self.dff_ = dff
self.dropout_rate_ = dropout_rate
self.n_epochs_ = n_epochs
self.batch_size_ = batch_size
self.cache_dir_ = cache_dir
self.model_name_ = model_name
self.verbose_ = verbose
def train_xpdnet_block(
model_fun,
model_kwargs,
model_size=None,
multicoil=True,
brain=False,
af=4,
contrast=None,
n_samples=None,
batch_size=None,
n_epochs=200,
n_iter=10,
res=True,
n_scales=0,
n_primal=5,
use_mixed_precision=False,
refine_smaps=False,
refine_big=False,
loss='mae',
lr=1e-4,
fixed_masks=False,
equidistant_fake=False,
multi_gpu=False,
mask_type=None,
primal_only=True,
n_dual=1,
n_dual_filters=16,
multiscale_kspace_learning=False,
block_size=10,
block_overlap=0,
epochs_per_block_step=None,
):
r"""Train an XPDNet network on the fastMRI dataset.
The training is done with a learning rate of 1e-4, using the RAdam optimizer.
The validation is performed every 5 epochs on 5 volumes.
A scale factor of 1e6 is applied to the data.
Arguments:
model_fun (function): the function initializing the image correction
network of the XPDNet.
model_kwargs (dict): the set of arguments used to initialize the image
correction network.
model_size (str or None): a string describing the size of the network
used. This is used in the run id. Defaults to None.
multicoil (bool): whether the input data is multicoil. Defaults to False.
brain (bool): whether to consider brain data instead of knee. Defaults
to False.
af (int): the acceleration factor for the retrospective undersampling
of the data. Defaults to 4.
contrast (str or None): the contrast used for this specific training.
If None, all contrasts are considered. Defaults to None
n_samples (int or None): the number of samples to consider for this
training. If None, all samples are considered. Defaults to None.
n_epochs (int): the number of epochs (i.e. one pass though all the
volumes/samples) for this training. Defaults to 200.
checkpoint_epoch (int): the number of epochs used to train the model
during the first step of the full training. This is typically used
when on a cluster the training duration exceeds the maximum job
duration. Defaults to 0, which means that the training is done
without checkpoints.
save_state (bool): whether you should save the entire model state for
this training, for example to retrain where left off. Defaults to
False.
n_iter (int): the number of iterations for the XPDNet.
res (bool): whether the XPDNet image correction networks should be
residual.
n_scales (int): the number of scales used in the image correction
network. Defaults to 0.
n_primal (int): the size of the buffer in the image space. Defaults to
5.
use_mixed_precision (bool): whether to use the mixed precision API for
training. Currently not working. Defaults to False.
refine_smaps (bool): whether you want to refine the sensitivity maps
with a neural network.
loss (tf.keras.losses.Loss or str): the loss function used for the
training. It should be understandable by the tf.keras loss API,
or be 'compound_mssim', in which case the compound L1 MSSIM loss
inspired by [P2020]. Defaults to 'mae'.
original_run_id (str or None): run id of the same network trained before
fine-tuning. If this is present, the training is considered
fine-tuning for a network trained for 250 epochs. It will therefore
apply a learning rate of 1e-7 and the epoch size will be divided in
half. If None, the training is done normally, without loading
weights. Defaults to None.
fixed_masks (bool): whether fixed masks should be used for the
retrospective undersampling. Defaults to False
n_epochs_original (int): the number of epochs used to pre-train the
model, only applicable if original_run_id is not None. Defaults to
250.
equidistant_fake (bool): whether to use fake equidistant masks from
fastMRI. Defaults to False.
multi_gpu (bool): whether to use multiple GPUs for the XPDNet training.
Defaults to False.
Returns:
- str: the run id of the trained network.
"""
if brain:
n_volumes = brain_n_volumes_train
else:
n_volumes = n_volumes_train
# paths
if multicoil:
if brain:
train_path = f'{FASTMRI_DATA_DIR}brain_multicoil_train/'
val_path = f'{FASTMRI_DATA_DIR}brain_multicoil_val/'
else:
train_path = f'{FASTMRI_DATA_DIR}multicoil_train/'
val_path = f'{FASTMRI_DATA_DIR}multicoil_val/'
else:
train_path = f'{FASTMRI_DATA_DIR}singlecoil_train/singlecoil_train/'
val_path = f'{FASTMRI_DATA_DIR}singlecoil_val/'
af = int(af)
# trying mixed precision
if use_mixed_precision:
policy_type = 'mixed_float16'
else:
policy_type = 'float32'
policy = mixed_precision.Policy(policy_type)
mixed_precision.set_policy(policy)
# generators
if multicoil:
dataset = multicoil_dataset
if mask_type is None:
if brain:
if equidistant_fake:
mask_type = 'equidistant_fake'
else:
mask_type = 'equidistant'
else:
mask_type = 'random'
kwargs = {
'parallel': False,
'output_shape_spec': brain,
'mask_type': mask_type,
}
else:
dataset = singlecoil_dataset
kwargs = {}
train_set = dataset(train_path,
AF=af,
contrast=contrast,
inner_slices=None,
rand=True,
scale_factor=1e6,
n_samples=n_samples,
fixed_masks=fixed_masks,
batch_size=batch_size,
target_image_size=IM_SIZE,
**kwargs)
val_set = dataset(val_path,
AF=af,
contrast=contrast,
inner_slices=None,
rand=True,
scale_factor=1e6,
**kwargs)
run_params = {
'n_primal': n_primal,
'multicoil': multicoil,
'n_scales': n_scales,
'n_iter': n_iter,
'refine_smaps': refine_smaps,
'res': res,
'output_shape_spec': brain,
'multi_gpu': multi_gpu,
'refine_big': refine_big,
'primal_only': primal_only,
'n_dual': n_dual,
'n_dual_filters': n_dual_filters,
'multiscale_kspace_learning': multiscale_kspace_learning,
}
if multicoil:
xpdnet_type = 'xpdnet_sense_'
if brain:
xpdnet_type += 'brain_'
else:
xpdnet_type = 'xpdnet_singlecoil_'
additional_info = f'af{af}'
if contrast is not None:
additional_info += f'_{contrast}'
if n_samples is not None:
additional_info += f'_{n_samples}'
if n_iter != 10:
additional_info += f'_i{n_iter}'
if loss != 'mae':
additional_info += f'_{loss}'
if refine_smaps:
additional_info += '_rf_sm'
if refine_big:
additional_info += 'b'
if fixed_masks:
additional_info += '_fixed_masks'
if block_overlap != 0:
additional_info += f'_blkov{block_overlap}'
submodel_info = model_fun.__name__
if model_size is not None:
submodel_info += model_size
run_id = f'{xpdnet_type}_{additional_info}_bbb_{submodel_info}_{int(time.time())}'
chkpt_path = f'{CHECKPOINTS_DIR}checkpoints/{run_id}' + '-{epoch:02d}'
chkpt_path += '.hdf5'
log_dir = op.join(f'{LOGS_DIR}logs', run_id)
tboard_cback = TensorBoard(
profile_batch=0,
log_dir=log_dir,
histogram_freq=0,
write_graph=False,
write_images=False,
)
tqdm_cback = TQDMProgressBar()
model = XPDNet(model_fun, model_kwargs, **run_params)
n_steps = n_volumes
if batch_size is not None:
n_steps //= batch_size
chkpt_cback = ModelCheckpointWorkAround(
chkpt_path,
save_freq=int(n_epochs * n_steps),
save_weights_only=True,
)
print(run_id)
stride = block_size - block_overlap
assert stride > 0
n_block_steps = int(math.ceil((n_iter - block_size) / stride) + 1)
## epochs handling
start_epoch = 0
final_epoch = min(epochs_per_block_step, n_epochs)
for i_step in range(n_block_steps):
first_block_to_train = i_step * stride
blocks = list(
range(first_block_to_train, first_block_to_train + block_size))
model.blocks_to_train = blocks
default_model_compile(model, lr=lr, loss=loss)
model.fit(
train_set,
steps_per_epoch=n_steps,
initial_epoch=start_epoch,
epochs=final_epoch,
validation_data=val_set,
validation_steps=5,
validation_freq=5,
verbose=0,
callbacks=[tboard_cback, chkpt_cback, tqdm_cback],
)
n_epochs = n_epochs - (final_epoch - start_epoch)
if n_epochs <= 0:
break
start_epoch = final_epoch
final_epoch += min(epochs_per_block_step, n_epochs)
return run_id
def training(meta_train_iterations, meta_batch_size, k_support, k_query,
num_inner_updates, inner_update_lr, learn_inner_update_lr,
meta_lr, job_dir):
policy = mixed_precision.Policy('mixed_float16')
mixed_precision.set_policy(policy)
mirrored_strategy = tf.distribute.MirroredStrategy()
data_generator = DataGenerator(k_support, k_query, meta_batch_size,
'meta_train', job_dir)
data_generator_valid = DataGenerator(2, 32, meta_batch_size, 'meta_val',
job_dir)
itr = 0
meta_loss_log_dir_2 = os.path.join(job_dir,
'summary_6_intrain_2_intest/meta_loss')
meta_metric_log_dir_2 = os.path.join(
job_dir, 'summary_6_intrain_2_intest/meta_metric')
meta_loss_summary_writer = tf.summary.create_file_writer(
meta_loss_log_dir_2)
meta_metric_writer = tf.summary.create_file_writer(meta_metric_log_dir_2)
with mirrored_strategy.scope():
maml = MAML(k_support,
k_query,
num_inner_updates=num_inner_updates,
inner_update_lr=inner_update_lr,
learn_inner_update_lr=learn_inner_update_lr)
optim = tf.keras.optimizers.Adam(learning_rate=meta_lr)
optim = mixed_precision.LossScaleOptimizer(optim, loss_scale='dynamic')
storage_client = storage.Client()
acc_metric = tf.keras.metrics.CategoricalAccuracy('train_accuracy')
dataset = data_generator.create_dataset().take(meta_train_iterations)
dist_dataset = mirrored_strategy.experimental_distribute_dataset(dataset)
num_replicas = mirrored_strategy.num_replicas_in_sync
logging.info('mirrored_strategy.num_replicas_in_sync: %d' % (num_replicas))
best_evel_mIoU = 0
model_exp_str = 'mbs_' + str(meta_batch_size) + '.k_support_' + str(
k_support) + '.k_query_' + str(k_query) + '.inner_steps_' + str(
num_inner_updates) + '.inner_lr_' + str(
inner_update_lr) + '.learn_inner_update_lr_' + str(
learn_inner_update_lr) + '.meta_lr_' + str(meta_lr)
model_file = os.path.join(job_dir, 'weights_inner_update_4', model_exp_str)
for input_support_replica, input_query_replica, label_support_replica, label_query_replica, ids_replica, query_indices_replica in dist_dataset:
itr = itr + 1
inp = (input_support_replica, input_query_replica,
label_support_replica, label_query_replica)
output_query_replicas, meta_loss = distributed_train_step(
inp, maml, num_replicas, optim, mirrored_strategy)
logging.info('Iteration %d: meta loss: %.5f ' % (itr, meta_loss))
if itr % 1 == 0:
if num_replicas > 1:
output_query = output_query_replicas.values
output_query = tf.concat(output_query, 0)
label_query = label_query_replica.values
label_query = tf.concat(label_query, 0)
else:
output_query = output_query_replicas
label_query = label_query_replica
label_query = tf.cast(label_query, dtype=tf.float32)
pred = tf.one_hot(tf.argmax(output_query, axis=-1),
depth=data_generator.LABEL_SIZE)
with tf.device('/CPU:0'):
mIoU = compute_mIoU(label_query[:, :, :, :,
1:], pred[:, :, :, :, 1:],
data_generator.LABEL_SIZE - 1)
logging.info('Iteration %d: mean IoU: %.5f ' % (itr, mIoU))
with tf.device('/CPU:0'):
acc_metric.update_state(
label_query[:, :, :, :, 1:],
tf.math.softmax(output_query)[:, :, :, :, 1:])
acc = acc_metric.result()
logging.info('Iteration %d: accuracy: %.5f ' % (itr, acc))
acc_metric.reset_states()
with meta_loss_summary_writer.as_default():
tf.summary.scalar('train-meta-loss', meta_loss, step=itr)
with meta_metric_writer.as_default():
tf.summary.scalar('train mean IoU', mIoU, step=itr)
with meta_metric_writer.as_default():
tf.summary.scalar('train accuracy', acc, step=itr)
# evaluation session
if itr % 150 == 0:
valid_set = data_generator_valid.sample_batch(
) # only one batch, size of meta_batch_size
dist_valid_dataset_single_elem = mirrored_strategy.experimental_distribute_dataset(
valid_set)
for input_support_val_replica, input_query_val_replica, label_support_val_replica, label_query_val_replica, ids_val_replica, query_indices_val_replica in dist_valid_dataset_single_elem: # only one elem in the dataset
inp_valid = (input_support_val_replica,
input_query_val_replica,
label_support_val_replica,
label_query_val_replica)
output_query_valid_replicas, meta_loss_valid = distributed_valid_step(
inp_valid, maml, num_replicas, optim, mirrored_strategy)
logging.info('[VALIDATION] Iteration %d: meta loss: %.5f ' %
(itr, meta_loss_valid))
if num_replicas > 1:
output_query_valid = output_query_valid_replicas.values
output_query_valid = tf.concat(output_query_valid, 0)
label_query_valid = label_query_val_replica.values
label_query_valid = tf.concat(label_query_valid, 0)
ids_valid = tf.concat(ids_val_replica.values, 0)
query_indices_valid = tf.concat(
query_indices_val_replica.values, 0)
else:
output_query_valid = output_query_valid_replicas
label_query_valid = label_query_val_replica
ids_valid = ids_val_replica
query_indices_valid = query_indices_val_replica
label_query_valid = tf.cast(label_query_valid,
dtype=tf.float32)
pred_valid = tf.one_hot(tf.argmax(output_query_valid, axis=-1),
depth=data_generator.LABEL_SIZE)
with tf.device('/CPU:0'):
mIoU_valid = compute_mIoU(
label_query_valid[:, :, :, :,
1:], pred_valid[:, :, :, :, 1:],
data_generator.LABEL_SIZE - 1)
logging.info('[VALIDATION] Iteration %d: mean IoU: %.5f ' %
(itr, mIoU_valid))
if mIoU_valid > best_evel_mIoU:
best_evel_mIoU = mIoU_valid
logging.info("saving to ", model_file)
maml.save_weights(model_file)
with tf.device('/CPU:0'):
acc_metric.update_state(
label_query_valid[:, :, :, :, 1:],
tf.math.softmax(output_query_valid)[:, :, :, :, 1:])
acc_valid = acc_metric.result()
logging.info('[VALIDATION] Iteration %d: accuracy: %.5f ' %
(itr, acc_valid))
acc_metric.reset_states()
with meta_metric_writer.as_default():
tf.summary.scalar('eval mean IoU', mIoU_valid, step=itr)
with meta_metric_writer.as_default():
tf.summary.scalar('eval accuracy', acc_valid, step=itr)
with tf.device('/CPU:0'):
construct_predicted_label_batch(itr, ids_valid,
query_indices_valid,
label_query_valid,
pred_valid, job_dir,
storage_client)
with meta_loss_summary_writer.as_default():
tf.summary.scalar('eval-meta-loss',
meta_loss_valid,
step=itr)
def train_model(data_path,
batch_size,
image_size,
crop_size,
lr_schedule_name,
init_lr,
max_lr,
weight_decay,
optimizer,
model_type,
embedding_size,
num_epochs,
checkpoint_path,
cache_path=None,
margin=0.35,
range_test=False,
use_tpu=False,
tpu_name=None,
test_path='',
use_mixed_precision=False,
triplet_strategy='',
images_per_person=35,
people_per_sample=12,
pretrained_model='',
distance_metric="L2",
soft=True,
sigma=0.3,
use_lfw=True):
if use_tpu is True:
assert tpu_name is not None, '[ERROR] TPU name must be specified'
resolver = tf.distribute.cluster_resolver.TPUClusterResolver(
tpu=tpu_name)
tf.config.experimental_connect_to_cluster(resolver)
tf.tpu.experimental.initialize_tpu_system(resolver)
strategy = tf.distribute.experimental.TPUStrategy(resolver)
print("[INFO] TPUs: ", tf.config.list_logical_devices('TPU'))
if use_mixed_precision is True:
if use_tpu is True:
policy = mixed_precision.Policy('mixed_bfloat16')
else:
policy = mixed_precision.Policy('mixed_float16')
mixed_precision.set_policy(policy)
print(
"[INFO] Using mixed precision for training. This will reduce memory consumption\n"
)
train_dataset, n_imgs, n_classes = generate_training_dataset(
data_path=data_path,
image_size=image_size,
batch_size=batch_size,
crop_size=crop_size,
cache=cache_path,
use_mixed_precision=use_mixed_precision,
images_per_person=images_per_person,
people_per_sample=people_per_sample,
use_tpu=use_tpu,
model_type=model_type)
if test_path is not None and len(test_path) > 1:
if use_lfw is True:
test_dataset, test_images, _ = get_LFW_dataset(
data_path=test_path,
image_size=image_size,
batch_size=batch_size,
crop_size=crop_size,
cache='./lfw_dataset_cache.tfcache',
use_mixed_precision=use_mixed_precision,
use_tpu=use_tpu,
train_classes=n_classes,
model_type=model_type)
else:
test_dataset, test_images, _ = get_test_dataset(
data_path=test_path,
image_size=image_size,
batch_size=30,
crop_size=crop_size,
cache='./test_dataset_cache.tfcache',
use_mixed_precision=use_mixed_precision,
use_tpu=use_tpu,
train_classes=n_classes,
model_type=model_type)
else:
test_dataset = None
if triplet_strategy == 'VANILLA':
loss_fn = tfa.losses.TripletSemiHardLoss(margin=margin)
print('[INFO] Using vanilla triplet loss')
elif triplet_strategy == 'BATCH_HARD':
loss_fn = TripletBatchHardLoss(margin=margin,
soft=soft,
distance_metric=distance_metric)
print('[INFO] Using batch-hard strategy.')
elif triplet_strategy == 'BATCH_HARD_V2':
loss_fn = TripletBatchHardV2Loss(margin1=(-1.0 * margin),
margin2=(margin1 / 100.0),
beta=0.002,
distance_metric=distance_metric)
print('[INFO] Using batch-hard V2 strategy')
elif triplet_strategy == 'ADAPTIVE':
loss_fn = AdaptiveTripletLoss(margin=margin, soft=soft, lambda_=sigma)
print('[INFO] Using Adaptive Triplet Loss')
else:
loss_fn = TripletFocalLoss(margin=margin,
sigma=sigma,
soft=soft,
distance_metric=distance_metric)
print('[INFO] Using triplet focal loss.')
triplet_loss_metrics = TripletLossMetrics(test_images, embedding_size)
if range_test is True:
opt = get_optimizer(optimizer_name=optimizer,
lr_schedule=1e-5,
weight_decay=weight_decay)
if use_tpu is True:
with strategy.scope():
model = create_neural_network(model_type=model_type,
embedding_size=embedding_size)
assert model is not None, '[ERROR] There was a problem while loading the pre-trained weights'
else:
model = create_neural_network(model_type=model_type,
embedding_size=embedding_size)
assert model is not None, '[ERROR] There was a problem while loading the pre-trained weights'
lrs = []
losses = []
for epoch in range(5):
for step, (x_batch_train,
y_batch_train) in enumerate(train_dataset):
with tf.GradientTape() as tape:
logits = model(x_batch_train, training=True)
loss_value = loss_fn(y_batch_train, logits)
grads = tape.gradient(loss_value, model.trainable_weights)
perturbations = opt.first_step(grads, model)
with tf.GradientTape() as tape:
logits = model(x_batch_train, training=True)
loss_value = loss_fn(y_batch_train, logits)
grads = tape.gradient(loss_value, model.trainable_weights)
opt.second_step(grads, model, perturbations)
losses.append(float(loss_value.numpy()))
lrs.append(opt.base_optimizer.lr.numpy())
if step % 200 == 0 and step > 0:
print("Step : %d :: Current loss : %f" %
(step, float(loss_value.numpy())))
plt.xscale('log')
plt.plot(lrs, losses, color='blue')
smooth_losses = savgol_filter(losses, 7, 3)
plt.plot(lrs, smooth_losses, color='red')
plt.xlabel('Log learning rate')
plt.ylabel('Loss')
plt.savefig('./range_test_result.png')
for x_batch_test, y_batch_test in test_dataset:
val_logits = model(x_batch_test, training=False)
triplet_loss_metrics.update_state(y_batch_test, val_logits)
result = triplet_loss_metrics.result()
print(str(result.numpy()))
triplet_loss_metrics.reset_states()
plt.xscale('log')
plt.plot(lrs, losses, color='blue')
smooth_losses = savgol_filter(losses, 7, 3)
plt.plot(lrs, smooth_losses, color='red')
plt.xlabel('Log learning rate')
plt.ylabel('Loss')
plt.savefig('./range_test_result.png')
print(
'\n[INFO] Training complete. Range test results can be found at "./range_test_result.png"'
)
return
else:
lr_schedule = get_learning_rate_schedule(
schedule_name=lr_schedule_name,
learning_rate=init_lr,
max_lr=max_lr,
image_count=n_imgs,
batch_size=batch_size)
opt = get_optimizer(optimizer_name=optimizer,
lr_schedule=lr_schedule,
weight_decay=weight_decay)
if not os.path.exists(checkpoint_path):
os.mkdir(checkpoint_path)
checkpoint_name = checkpoint_path + '/' + 'cp-{epoch:03d}.ckpt'
if use_tpu is True:
with strategy.scope():
model = create_neural_network(model_type=model_type,
embedding_size=embedding_size)
assert model is not None, '[ERROR] There was a problem while loading the pre-trained weights'
else:
model = create_neural_network(model_type=model_type,
embedding_size=embedding_size)
assert model is not None, '[ERROR] There was a problem while loading the pre-trained weights'
for epoch in range(num_epochs):
for step, (x_batch_train,
y_batch_train) in enumerate(train_dataset):
with tf.GradientTape() as tape:
logits = model(x_batch_train, training=True)
loss_value = loss_fn(y_batch_train, logits)
grads = tape.gradient(loss_value, model.trainable_weights)
perturbations = opt.first_step(grads, model)
with tf.GradientTape() as tape:
logits = model(x_batch_train, training=True)
loss_value = loss_fn(y_batch_train, logits)
grads = tape.gradient(loss_value, model.trainable_weights)
opt.second_step(grads, model, perturbations)
if step % 200 == 0:
print("Step : %d :: Current loss : %f" %
(step, float(loss_value)))
for x_batch_test, y_batch_test in test_dataset:
val_logits = model(x_batch_test, training=False)
triplet_loss_metrics.update_state(y_batch_test, val_logits)
result = triplet_loss_metrics.result()
print(str(result))
triplet_loss_metrics.reset_states()
if epoch % 5 == 0:
model.save(checkpoint_name.format(epoch))
if not os.path.exists('./results'):
os.mkdir('./results')
model_name = './results/model-' + datetime.now().strftime(
"%Y%m%d-%H%M%S")
model.save(model_name)
print(
'\n[INFO] Training complete. Saved model can be found in "./results"'
)
return
def set_keras_mixed_precision_policy(policy_name: str) -> None:
"""Set tf.keras mixed precision"""
policy = mixed_precision.Policy(policy_name)
mixed_precision.set_policy(policy)
def main(config):
gpus = tf.config.experimental.list_physical_devices('GPU')
tf.config.experimental.set_visible_devices(devices=gpus[config.device],
device_type='GPU')
if config.gpu_growth:
for gpu in tf.config.experimental.list_physical_devices('GPU'):
tf.config.experimental.set_memory_growth(gpu, True)
assert config.precision in (16, 32), config.precision
if config.precision == 16:
prec.set_policy(prec.Policy('mixed_float16'))
config.steps = int(config.steps)
config.logdir.mkdir(parents=True, exist_ok=True)
print('Logdir', config.logdir)
# Create environments.
datadir = config.logdir / 'episodes'
writer = tf.summary.create_file_writer(str(config.logdir),
max_queue=1000,
flush_millis=20000)
writer.set_as_default()
train_envs = [
wrappers.Async(
lambda: make_env(config, writer, 'train', datadir, store=True),
config.parallel) for _ in range(config.envs)
]
test_envs = [
wrappers.Async(
lambda: make_env(config, writer, 'test', datadir, store=False),
config.parallel) for _ in range(config.envs)
]
actspace = train_envs[0].action_space
# Prefill dataset with random episodes.
step = count_steps(datadir, config)
prefill = max(0, config.prefill - step)
print(f'Prefill dataset with {prefill} steps.')
random_agent = lambda o, d, _: ([actspace.sample() for _ in d], None)
tools.simulate(random_agent, train_envs, prefill / config.action_repeat)
writer.flush()
# Train and regularly evaluate the agent.
step = count_steps(datadir, config)
print(f'Simulating agent for {config.steps - step} steps.')
agent = Dreamer(config, datadir, actspace, writer)
if (config.logdir / 'variables.pkl').exists():
print('Load checkpoint.')
agent.load(config.logdir / 'variables.pkl')
state = None
while step < config.steps:
print('Start evaluation.')
if config.test_model == True:
print('Start evaluate model.')
tools.test_model(
functools.partial(agent, training=False),
test_envs,
episodes=1,
dynamics=agent._dynamics,
model_metric_summaries=agent._model_metric_summaries,
value=agent._value,
decode=agent._decode,
test_len=config.test_len)
else:
tools.simulate(functools.partial(agent, training=False),
test_envs,
episodes=1)
writer.flush()
print('Start collection.')
steps = config.eval_every // config.action_repeat
state = tools.simulate(agent, train_envs, steps, state=state)
step = count_steps(datadir, config)
agent.save(config.logdir / 'variables.pkl')
for env in train_envs + test_envs:
env.close()
def init_network(self):
# This function builds the compute graph.
# Optionally, it can build a 'subset' graph if this mode is
# Net construction:
start = time.time()
# Here, if using mixed precision, set a global policy:
if self.args.precision == "mixed":
from tensorflow.keras.mixed_precision import experimental as mixed_precision
self.policy = mixed_precision.Policy('mixed_float16')
mixed_precision.set_policy(self.policy)
if self.args.precision == "bfloat16":
from tensorflow.keras.mixed_precision import experimental as mixed_precision
self.policy = mixed_precision.Policy('mixed_bfloat16')
mixed_precision.set_policy(self.policy)
batch_dims = self.larcv_fetcher.batch_dims(1)
# We compute the
batch_dims[0] = self.local_batch_size()
#
self._global_step = tf.Variable(0, dtype=tf.int64)
# We have to make placeholders for input objects:
#
# self._input = {
# 'image' : tf.compat.v1.placeholder(floating_point_format, batch_dims, name="input_image"),
# 'label' : tf.compat.v1.placeholder(integer_format, batch_dims, name="input_label"),
# 'io_time' : tf.compat.v1.placeholder(floating_point_format, (), name="io_fetch_time")
# }
# Build the network object, forward pass only:
if self.args.conv_mode == '2D':
self._net = uresnet2D.UResNet(self.args)
else:
self._net = uresnet3D.UResNet3D(self.args)
self._net.trainable = True
# self._logits = self._net(self._input['image'], training=self.args.training)
# # If channels first, need to permute the logits:
# if self._channels_dim == 1:
# permutation = tf.keras.layers.Permute((2, 3, 1))
# self._loss_logits = [ permutation(l) for l in self._logits ]
# else:
# self._loss_logits = self._logits
# TO PROPERLY INITIALIZE THE NETWORK, NEED TO DO A FORWARD PASS
minibatch_data = self.larcv_fetcher.fetch_next_batch("train",
force_pop=False)
image, label = self.cast_input(minibatch_data['image'],
minibatch_data['label'])
self.forward_pass(image, label, training=False)
# # Here, if the data format is channels_first, we have to reorder the logits tensors
# # To put channels last. Otherwise it does not work with the softmax tensors.
#
#
# # Apply a softmax and argmax:
# self._output = dict()
#
# # Take the logits (which are one per plane) and create a softmax and prediction (one per plane)
# with tf.compat.v1.variable_scope("prediction"):
# self._output['prediction'] = [ tf.argmax(x, axis=self._channels_dim) for x in self._logits]
#
# with tf.compat.v1.variable_scope("cross_entropy"):
#
# self._input['split_labels'] = [
# tf.squeeze(l, axis=self._channels_dim)
# for l in tf.split(self._input['label'], 3, self._channels_dim)
# ]
# self._input['split_images'] = [
# tf.squeeze(l, axis=self._channels_dim)
# for l in tf.split(self._input['image'], 3, self._channels_dim)
# ]
#
# self._loss = self.loss_calculator(
# labels = self._input['split_labels'],
# logits = self._loss_logits)
#
#
# if self.args.mode == "inference":
# self._output['softmax'] = [tf.nn.softmax(x, axis=self._channels_dim) for x in self._logits]
self.acc_calculator = AccuracyCalculator.AccuracyCalculator()
self.loss_calculator = LossCalculator.LossCalculator(
self.args.loss_balance_scheme, self._channels_dim)
self._log_keys = ["loss", "Average/Non_Bkg_Accuracy", "Average/mIoU"]
end = time.time()
return end - start
import tensorflow as tf
from tensorflow.keras.preprocessing.image import ImageDataGenerator
from tensorflow.keras.mixed_precision import experimental as mixed_precision
import pandas as pd
from tensorflow.keras.layers import Flatten, Dense, LeakyReLU, BatchNormalization, Dropout
import keras.backend as K
from tensorflow.keras.callbacks import ModelCheckpoint, EarlyStopping
import efficientnet.keras as efn
import tensorflow_addons as tfa
policy = mixed_precision.Policy('mixed_float16')
mixed_precision.set_policy(policy)
datagen = ImageDataGenerator(rescale=1. / 255, validation_split=0.2, horizontal_flip=True)
train_csv = pd.read_csv(r"/content/train.csv")
train_csv["label"] = train_csv["label"].astype(str)
base_model = tf.keras.applications.ResNet50(weights='imagenet', input_shape=(512, 512, 3), include_top=True)
base_model.trainable = True
model = tf.keras.Sequential([
tf.keras.layers.Input((512, 512, 3)),
tf.keras.layers.BatchNormalization(renorm=True),
base_model,
BatchNormalization(),
tf.keras.layers.LeakyReLU(),
tf.keras.layers.Flatten(),
tf.keras.layers.Dense(512),
BatchNormalization(),
def build(model_fn: Callable[[], Union[Model, List[Model]]],
optimizer_fn: Union[str, Scheduler, Callable, List[str],
List[Callable], List[Scheduler], None],
weights_path: Union[str, None, List[Union[str, None]]] = None,
model_name: Union[str, List[str], None] = None,
mixed_precision: bool = False) -> Union[Model, List[Model]]:
"""Build model instances and associate them with optimizers.
This method can be used with TensorFlow models / optimizers:
```python
model_def = fe.architecture.tensorflow.LeNet
model = fe.build(model_fn = model_def, optimizer_fn="adam")
model = fe.build(model_fn = model_def, optimizer_fn=lambda: tf.optimizers.Adam(lr=0.1))
model = fe.build(model_fn = model_def, optimizer_fn="adam", weights_path="~/weights.h5")
```
This method can be used with PyTorch models / optimizers:
```python
model_def = fe.architecture.pytorch.LeNet
model = fe.build(model_fn = model_def, optimizer_fn="adam")
model = fe.build(model_fn = model_def, optimizer_fn=lambda x: torch.optim.Adam(params=x, lr=0.1))
model = fe.build(model_fn = model_def, optimizer_fn="adam", weights_path="~/weights.pt)
```
Args:
model_fn: A function that define model(s).
optimizer_fn: Optimizer string/definition or a list of optimizer instances/strings. The number of optimizers
provided here should match the number of models generated by the `model_fn`.
model_name: Name(s) of the model(s) that will be used for logging purpose. If None, a name will be
automatically generated and assigned.
weights_path: Path(s) from which to load model weights. If not None, then the number of weight paths provided
should match the number of models generated by the `model_fn`.
mixed_precision: Whether to enable mix precision network operations, only applies to tensorflow models.
Returns:
models: The model(s) built by FastEstimator.
"""
def _generate_model_names(num_names):
names = [
"model" if i + build.count == 0 else "model{}".format(i +
build.count)
for i in range(num_names)
]
build.count += num_names
return names
if not hasattr(build, "count"):
build.count = 0
# mix-precision handling
if mixed_precision:
mixed_precision_tf.set_policy(
mixed_precision_tf.Policy('mixed_float16'))
else:
mixed_precision_tf.set_policy(mixed_precision_tf.Policy('float32'))
models, optimizer_fn = to_list(model_fn()), to_list(optimizer_fn)
# fill optimizer
if not optimizer_fn:
optimizer_fn = [None]
# check framework
if isinstance(models[0], tf.keras.Model):
framework = "tf"
elif isinstance(models[0], torch.nn.Module):
framework = "torch"
else:
raise ValueError("unrecognized model format: {}".format(type(
models[0])))
# multi-gpu handling
if torch.cuda.device_count() > 1:
if framework == "tf" and not isinstance(
tf.distribute.get_strategy(), tf.distribute.MirroredStrategy):
tf.distribute.experimental_set_strategy(
tf.distribute.MirroredStrategy())
models = to_list(model_fn())
if framework == "torch":
models = [torch.nn.DataParallel(model) for model in models]
# generate names
if not model_name:
model_name = _generate_model_names(len(models))
model_name = to_list(model_name)
# load weights
if weights_path:
weights_path = to_list(weights_path)
else:
weights_path = [None] * len(models)
assert len(models) == len(optimizer_fn) == len(weights_path) == len(model_name), \
"Found inconsistency in number of models, optimizers, model_name or weights"
# create optimizer
for idx, (model, optimizer_def, weight, name) in enumerate(
zip(models, optimizer_fn, weights_path, model_name)):
models[idx] = trace_model(_fe_compile(model, optimizer_def, weight,
name, framework),
model_idx=idx if len(models) > 1 else -1,
model_fn=model_fn,
optimizer_fn=optimizer_def,
weights_path=weight)
if len(models) == 1:
models = models[0]
return models
