def _infer_state_specs(
layers: Sequence[tf.keras.layers.Layer]
) -> Tuple[types.NestedTensorSpec, List[bool]]:
"""Infer the state spec of a sequence of keras Layers and Networks.
Args:
layers: A list of Keras layers and Network.
Returns:
A tuple with `state_spec`, a tuple of the state specs of length
`len(layers)` and a list of bools indicating if the corresponding layer
has lists in it's state.
"""
state_specs = []
layer_state_is_list = []
for layer in layers:
spec = network.get_state_spec(layer)
if isinstance(spec, list):
layer_state_is_list.append(True)
state_specs.append(tuple(spec))
else:
state_specs.append(spec)
layer_state_is_list.append(False)
return tuple(state_specs), layer_state_is_list
def _infer_specs(
layers: typing.Sequence[tf.keras.layers.Layer],
input_spec: types.NestedTensorSpec
) -> typing.Tuple[
types.NestedTensorSpec,
types.NestedTensorSpec
]:
"""Infer the state spec of a sequence of keras Layers and Networks.
This runs `create_variables` on each layer, and identifies the
state spec from each. Running `create_variables` is necessary
because this creates a `_network_state_spec` property on each
generic (non-Network) Keras layer.
Args:
layers: A list of Keras layers and Network.
input_spec: The input to the first laayer.
Returns:
A tuple `(output_spec, state_spec)` where `output_spec` is the output spec
from the final layer and `state_spec` is a tuple of the state specs.
"""
state_specs = []
output_spec = input_spec
for layer in layers:
output_spec = network.create_variables(layer, output_spec)
state_spec = network.get_state_spec(layer)
state_specs.append(state_spec)
state_specs = tuple(state_specs)
return output_spec, state_specs
def _infer_state_specs(
layers: Sequence[tf.keras.layers.Layer]) -> types.NestedTensorSpec:
"""Infer the state spec of a sequence of keras Layers and Networks.
Args:
layers: A list of Keras layers and Network.
Returns:
`state_spec`, a tuple of the state specs of length `len(layers)`.
"""
state_specs = tuple(network.get_state_spec(layer) for layer in layers)
return state_specs # pytype: disable=bad-return-type