def apply(self,
inputs,
num_classes,
filter_shape=(5, 5),
filters=(16, 32),
dense_size=64,
train=True,
init_fn=flax.nn.initializers.kaiming_normal,
activation_fn=flax.nn.relu,
masks=None,
masked_layer_indices=None):
"""Applies a convolution to the inputs.
Args:
inputs: Input data with dimensions (batch, spatial_dims..., features).
num_classes: Number of classes in the dataset.
filter_shape: Shape of the convolutional filters.
filters: Number of filters in each convolutional layer, and number of conv
layers (given by length of sequence).
dense_size: Number of filters in each convolutional layer, and number of
conv layers (given by length of sequence).
train: If model is being evaluated in training mode or not.
init_fn: Initialization function used for convolutional layers.
activation_fn: Activation function to be used for convolutional layers.
masks: Masks of the layers in this model, in the same form as
module params, or None.
masked_layer_indices: The layer indices of layers in model to be masked.
Returns:
A tensor of shape (batch, num_classes), containing the logit output.
Raises:
ValueError if the number of pooling layers is too many for the given input
size.
"""
# Note: First dim is batch, last dim is channels, other dims are "spatial".
if not all([(dim >= 2**len(filters)) for dim in inputs.shape[1:-2]]):
raise ValueError(
'Input spatial size, {}, does not allow {} pooling layers.'.
format(str(inputs.shape[1:-2]), len(filters)))
depth = 2 + len(filters)
masks = masked.generate_model_masks(depth, masks, masked_layer_indices)
batch_norm = flax.nn.BatchNorm.partial(use_running_average=not train,
momentum=0.99,
epsilon=1e-5)
for i, filter_num in enumerate(filters):
if f'MaskedModule_{i}' in masks:
logging.info('Layer %d is masked in model', i)
mask = masks[f'MaskedModule_{i}']
inputs = masked.masked(flax.nn.Conv, mask)(
inputs,
features=filter_num,
kernel_size=filter_shape,
kernel_init=init.sparse_init(
init_fn(),
mask['kernel'] if mask is not None else None))
else:
inputs = flax.nn.Conv(inputs,
features=filter_num,
kernel_size=filter_shape,
kernel_init=init_fn())
inputs = batch_norm(inputs, name='bn_conv_{}'.format(i))
inputs = activation_fn(inputs)
if i < len(filters) - 1:
inputs = flax.nn.max_pool(inputs,
window_shape=(2, 2),
strides=(2, 2),
padding='VALID')
# Global average pool at end of convolutional layers.
inputs = flax.nn.avg_pool(inputs,
window_shape=inputs.shape[1:-1],
padding='VALID')
# This is effectively a Dense layer, but we cast it as a convolution layer
# to allow us to easily propagate masks, avoiding b/156135283.
if f'MaskedModule_{depth - 2}' in masks:
mask_dense_1 = masks[f'MaskedModule_{depth - 2}']
inputs = masked.masked(flax.nn.Conv, mask_dense_1)(
inputs,
features=dense_size,
kernel_size=inputs.shape[1:-1],
kernel_init=init.sparse_init(
init_fn(), mask_dense_1['kernel']
if mask_dense_1 is not None else None))
else:
inputs = flax.nn.Conv(inputs,
features=dense_size,
kernel_size=inputs.shape[1:-1],
kernel_init=init_fn())
inputs = batch_norm(inputs, name='bn_dense_1')
inputs = activation_fn(inputs)
inputs = flax.nn.Dense(
inputs,
features=num_classes,
kernel_init=flax.nn.initializers.xavier_normal())
inputs = batch_norm(inputs, name='bn_dense_2')
inputs = jnp.squeeze(inputs)
return flax.nn.log_softmax(inputs)
def apply(self,
inputs,
num_classes,
features=(32, 32),
train=True,
init_fn=flax.deprecated.nn.initializers.kaiming_normal,
activation_fn=flax.deprecated.nn.relu,
masks=None,
masked_layer_indices=None,
dropout_rate=0.):
"""Applies fully-connected neural network to the inputs.
Args:
inputs: Input data with dimensions (batch, features), if features has more
than one dimension, it is flattened.
num_classes: Number of classes in the dataset.
features: Number of neurons in each layer, and number of layers (given by
length of sequence) + one layer for softmax.
train: If model is being evaluated in training mode or not.
init_fn: Initialization function used for dense layers.
activation_fn: Activation function to be used for dense layers.
masks: Masks of the layers in this model, in the same form as module
params, or None.
masked_layer_indices: The layer indices of layers in model to be masked.
dropout_rate: Dropout rate, if 0 then dropout is not used (default).
Returns:
A tensor of shape (batch, num_classes), containing the logit output.
"""
batch_norm = flax.deprecated.nn.BatchNorm.partial(
use_running_average=not train, momentum=0.99, epsilon=1e-5)
depth = 1 + len(features)
masks = masked.generate_model_masks(depth, masks, masked_layer_indices)
# If inputs are in image dimensions, flatten image.
inputs = inputs.reshape(inputs.shape[0], -1)
for i, feature_num in enumerate(features):
if f'MaskedModule_{i}' in masks:
logging.info('Layer %d is masked in model', i)
mask = masks[f'MaskedModule_{i}']
inputs = masked.masked(flax.deprecated.nn.Dense, mask)(
inputs,
features=feature_num,
kernel_init=init.sparse_init(
init_fn(),
mask['kernel'] if mask is not None else None))
else:
inputs = flax.deprecated.nn.Dense(inputs,
features=feature_num,
kernel_init=init_fn())
inputs = batch_norm(inputs, name=f'bn_conv_{i}')
inputs = activation_fn(inputs)
if dropout_rate > 0.0:
inputs = flax.deprecated.nn.dropout(inputs,
dropout_rate,
deterministic=not train)
inputs = flax.deprecated.nn.Dense(
inputs,
features=num_classes,
kernel_init=flax.deprecated.nn.initializers.xavier_normal())
return flax.deprecated.nn.log_softmax(inputs)