def test_scoping_creates_new_variables_across_instances(self):
output_size = 5
x = tf.random.uniform((1, 13))
self.assertFalse(tf.compat.v1.trainable_variables())
fn1 = feedforward_model(
output_size=output_size,
hidden_layer_sizes=(6, 4, 2),
name='feedforward_function_1')
_ = fn1([x])
num_trainable_variables_1 = len(tf.compat.v1.trainable_variables())
fn2 = feedforward_model(
output_size=output_size,
hidden_layer_sizes=(6, 4, 2),
name='feedforward_function_2')
_ = fn2([x])
num_trainable_variables_2 = len(tf.compat.v1.trainable_variables())
self.assertGreater(num_trainable_variables_1, 0)
self.assertEqual(
num_trainable_variables_1 * 2, num_trainable_variables_2)
num_trainable_variables_3 = len(tf.compat.v1.trainable_variables())
self.assertEqual(
num_trainable_variables_2, num_trainable_variables_3)
def test_scoping_creates_new_variables_across_instances(self):
output_size = 5
x = tf.random_uniform((1, 13))
self.assertFalse(tf.trainable_variables())
fn1 = feedforward_model(input_shapes=(x.shape[1:], ),
output_size=output_size,
hidden_layer_sizes=(6, 4, 2),
name='feedforward_function_1')
num_trainable_variables_1 = len(tf.trainable_variables())
fn2 = feedforward_model(input_shapes=(x.shape[1:], ),
output_size=output_size,
hidden_layer_sizes=(6, 4, 2),
name='feedforward_function_2')
num_trainable_variables_2 = len(tf.trainable_variables())
self.assertGreater(num_trainable_variables_1, 0)
self.assertEqual(num_trainable_variables_1 * 2,
num_trainable_variables_2)
# Make sure that all variables were created before calling the fn
_ = fn1([x])
_ = fn2([x])
num_trainable_variables_3 = len(tf.trainable_variables())
self.assertEqual(num_trainable_variables_2, num_trainable_variables_3)
def create_dynamics_model(input_shapes,
dynamics_latent_dim,
*args,
preprocessors=None,
observation_keys=None,
goal_keys=None,
name='dynamics_model',
encoder_kwargs=None,
decoder_kwargs=None,
**kwargs):
inputs_flat = create_inputs(input_shapes)
preprocessors_flat = (
flatten_input_structure(preprocessors)
if preprocessors is not None
else tuple(None for _ in inputs_flat))
assert len(inputs_flat) == len(preprocessors_flat), (
inputs_flat, preprocessors_flat)
preprocessed_inputs = [
preprocessor(input_) if preprocessor is not None else input_
for preprocessor, input_
in zip(preprocessors_flat, inputs_flat)
]
encoder = feedforward_model(
*args,
output_size=dynamics_latent_dim,
name=f'{name}_encoder',
**encoder_kwargs)
output_size = sum([
shape.as_list()[0]
for shape in input_shapes['observations'].values()
])
decoder = feedforward_model(
*args,
output_size=output_size,
name=f'{name}_decoder',
**decoder_kwargs)
latent = encoder(preprocessed_inputs)
dynamics_pred = decoder(latent)
dynamics_model = PicklableModel(inputs_flat, dynamics_pred, name=name)
dynamics_model.observation_keys = observation_keys or tuple()
dynamics_model.goal_keys = goal_keys or tuple()
dynamics_model.all_keys = dynamics_model.observation_keys + dynamics_model.goal_keys
dynamics_model.encoder = PicklableModel(inputs_flat, latent, name=f'{name}_encoder_model')
return dynamics_model
def state_estimator_model(
input_shape,
num_hidden_units=256,
num_hidden_layers=2,
output_size=4, # (x, y, z_cos, z_sin)
kernel_regularizer=None,
preprocessor_params=None,
preprocessor=None,
name='state_estimator_preprocessor'):
# TODO: Make this take in observation keys instead of this hardcoded output size.
obs_preprocessor_params = (preprocessor_params
or DEFAULT_STATE_ESTIMATOR_PREPROCESSOR_PARAMS)
# preprocessor = convnet_model(
# name='convnet_preprocessor_state_est',
# **convnet_kwargs)
if preprocessor is None:
preprocessor = get_preprocessor_from_params(None,
obs_preprocessor_params)
state_estimator = feedforward_model(
hidden_layer_sizes=(num_hidden_units, ) * num_hidden_layers,
output_size=output_size,
output_activation=tf.keras.activations.tanh,
kernel_regularizer=
kernel_regularizer, # tf.keras.regularizers.l2(0.001),
name='feedforward_state_est')
model = tfk.Sequential([
tfk.Input(shape=input_shape, name='pixels', dtype=tf.uint8),
preprocessor,
state_estimator,
],
name=name)
return model
def create_feedforward_Q_function(input_shapes,
*args,
preprocessors=None,
observation_keys=None,
name='feedforward_Q',
**kwargs):
print(input_shapes)
inputs_flat = create_inputs(input_shapes)
preprocessors_flat = (flatten_input_structure(preprocessors)
if preprocessors is not None else tuple(
None for _ in inputs_flat))
assert len(inputs_flat) == len(preprocessors_flat), (inputs_flat,
preprocessors_flat)
preprocessed_inputs = [
tf.cast(preprocessor(input_), dtype=tf.float32)
if preprocessor is not None else tf.cast(input_, dtype=tf.float32)
for preprocessor, input_ in zip(preprocessors_flat, inputs_flat)
]
Q_function = feedforward_model(*args, output_size=1, name=name, **kwargs)
Q_function = PicklableModel(inputs_flat, Q_function(preprocessed_inputs))
Q_function.observation_keys = observation_keys
return Q_function
def create_feedforward_Q_function(input_shapes,
*args,
preprocessors=None,
observation_keys=None,
goal_keys=None,
name='feedforward_Q',
**kwargs):
inputs_flat = create_inputs(input_shapes)
preprocessors_flat = (flatten_input_structure(preprocessors)
if preprocessors is not None else tuple(
None for _ in inputs_flat))
assert len(inputs_flat) == len(preprocessors_flat), (inputs_flat,
preprocessors_flat)
preprocessed_inputs = [
preprocessor(input_) if preprocessor is not None else input_
for preprocessor, input_ in zip(preprocessors_flat, inputs_flat)
]
Q_function = feedforward_model(*args, output_size=1, name=name, **kwargs)
Q_function = PicklableModel(inputs_flat, Q_function(preprocessed_inputs))
preprocessed_inputs_fn = PicklableModel(inputs_flat, preprocessed_inputs)
Q_function.observation_keys = observation_keys or ()
Q_function.goal_keys = goal_keys or ()
Q_function.all_keys = observation_keys + goal_keys
Q_function.actions_preprocessors = preprocessors['actions']
Q_function.observations_preprocessors = preprocessors['observations']
Q_function.preprocessed_inputs_fn = preprocessed_inputs_fn
return Q_function
def __call__(self, x, output_units, **condition_kwargs):
if not self._built:
self._shift_and_log_scale_model = feedforward_model(
hidden_layer_sizes=self.hidden_layer_sizes,
output_shape=[(1 if self.shift_only else 2) * output_units],
activation=self.activation,
output_activation=self.output_activation)
self._built = True
# condition_kwargs is a dict, but feedforward_model implicitly flattens
# these values. Effectively the same as
# self._shift_and_log_scale_model(tree.flatten((x, condition_kwargs)))
shift_and_log_scale = self._shift_and_log_scale_model(
(x, condition_kwargs))
# It would be nice to have these be encapsulated in the
# `self._shift_and_log_scale_model`, but the issue is that
# `tf.keras.Sequential` can't return tuples/lists, and functional
# model type would have to know the input shape in advance.
# The correct way here would be to create a subclassed model and
# instantiate the model in the `build` method.
shift, log_scale = tf.keras.layers.Lambda(
lambda x: tf.split(x, 2, axis=-1))(shift_and_log_scale)
bijector = bijectors.affine_scalar.AffineScalar(shift=shift,
log_scale=log_scale)
return bijector
def create_embedding_fn(input_shapes,
embedding_dim,
*args,
preprocessors=None,
observation_keys=None,
goal_keys=None,
name='embedding_fn',
**kwargs):
inputs_flat = create_inputs(input_shapes)
preprocessors_flat = (flatten_input_structure(preprocessors)
if preprocessors is not None else tuple(
None for _ in inputs_flat))
assert len(inputs_flat) == len(preprocessors_flat), (inputs_flat,
preprocessors_flat)
preprocessed_inputs = [
preprocessor(input_) if preprocessor is not None else input_
for preprocessor, input_ in zip(preprocessors_flat, inputs_flat)
]
embedding_fn = feedforward_model(*args,
output_size=embedding_dim,
name=f'feedforward_{name}',
**kwargs)
embedding_fn = PicklableModel(inputs_flat,
embedding_fn(preprocessed_inputs),
name=name)
embedding_fn.observation_keys = observation_keys or tuple()
embedding_fn.goal_keys = goal_keys or tuple()
embedding_fn.all_keys = embedding_fn.observation_keys + embedding_fn.goal_keys
return embedding_fn
def feedforward_Q_function(input_shapes,
*args,
preprocessors=None,
observation_keys=None,
name='feedforward_Q',
**kwargs):
inputs = create_inputs(input_shapes)
if preprocessors is None:
preprocessors = tree.map_structure(lambda _: None, inputs)
preprocessors = tree.map_structure_up_to(inputs,
preprocessors_lib.deserialize,
preprocessors)
preprocessed_inputs = apply_preprocessors(preprocessors, inputs)
# NOTE(hartikainen): `feedforward_model` would do the `cast_and_concat`
# step for us, but tf2.2 broke the sequential multi-input handling: See:
# https://github.com/tensorflow/tensorflow/issues/37061.
out = tf.keras.layers.Lambda(cast_and_concat)(preprocessed_inputs)
Q_model_body = feedforward_model(*args,
output_shape=[1],
name=name,
**kwargs)
Q_model = tf.keras.Model(inputs, Q_model_body(out), name=name)
Q_function = StateActionValueFunction(model=Q_model,
observation_keys=observation_keys,
name=name)
return Q_function
def _shift_and_log_scale_diag_net(self, output_size):
shift_and_log_scale_diag_net = feedforward_model(
hidden_layer_sizes=self._hidden_layer_sizes,
output_size=output_size,
activation=self._activation,
output_activation=self._output_activation)
return shift_and_log_scale_diag_net
def get_feedforward_preprocessor(observation_shape,
name='feedforward_preprocessor',
**kwargs):
from softlearning.models.feedforward import feedforward_model
preprocessor = feedforward_model(input_shapes=(observation_shape, ),
name=name,
**kwargs)
return preprocessor
def get_random_nn_preprocessor(name='random_nn_preprocessor', **kwargs):
from softlearning.models.feedforward import feedforward_model
preprocessor = feedforward_model(name=name, **kwargs)
# Don't update weights in this random NN
import ipdb
ipdb.set_trace()
preprocessor = tf.stop_gradient(preprocessor)
return preprocessor
def __init__(self, observation_space, output_size, *args, **kwargs):
super(FeedforwardPreprocessor, self).__init__(observation_space,
output_size)
assert isinstance(observation_space, spaces.Box)
input_shapes = (observation_space.shape, )
self._feedforward = feedforward_model(*args,
input_shapes=input_shapes,
output_size=output_size,
**kwargs)
def create_feedforward_V_function(observation_shape,
*args,
observation_preprocessor=None,
name='feedforward_V',
**kwargs):
input_shapes = (observation_shape, )
preprocessors = (observation_preprocessor, None)
return feedforward_model(input_shapes,
*args,
output_size=1,
preprocessors=preprocessors,
**kwargs)
def create_feedforward_Q_function(observation_shape,
action_shape,
*args,
observation_preprocessor=None,
name='feedforward_Q',
**kwargs):
input_shapes = (observation_shape, action_shape)
preprocessors = (observation_preprocessor, None)
return feedforward_model(input_shapes,
*args,
preprocessors=preprocessors,
name=name,
**kwargs)
def _shift_and_scale_diag_net(self, inputs, output_size):
preprocessed_inputs = self._preprocess_inputs(inputs)
shift_and_scale_diag = feedforward_model(
hidden_layer_sizes=self._hidden_layer_sizes,
output_shape=(output_size, ),
activation=self._activation,
output_activation=self._output_activation)(preprocessed_inputs)
shift, scale = tf.keras.layers.Lambda(lambda x: tf.split(
x, num_or_size_splits=2, axis=-1))(shift_and_scale_diag)
scale = tf.keras.layers.Lambda(lambda x: tf.math.softplus(x))(scale)
shift_and_scale_diag_model = tf.keras.Model(inputs, (shift, scale))
return shift_and_scale_diag_model
def create_feedforward_reward_classifier(observation_shape,
*args,
observation_preprocessor=None,
name='feedforward_classifier',
**kwargs):
input_shapes = (observation_shape, )
preprocessors = (observation_preprocessor, None)
return feedforward_model(
input_shapes,
*args,
output_size=1,
preprocessors=preprocessors,
kernel_regularizer=tf.keras.regularizers.l2(0.001),
**kwargs)
def test_clone_model(self):
"""Make sure that cloning works and clones can predict.
TODO(hartikainen): This test weirdly mixed `tf.keras.backend.eval`
with `self.evaluate`. Should figure out the best way to handle keras
and test sessions.
"""
output_size = 5
x_np = np.random.uniform(0, 1, (1, 13)).astype(np.float32)
x = tf.constant(x_np)
fn1 = feedforward_model(input_shapes=(x.shape[1:], x.shape[1:]),
output_size=output_size,
hidden_layer_sizes=(6, 4, 2),
name='feedforward_function')
tf.keras.backend.get_session().run(tf.global_variables_initializer())
fn2 = tf.keras.models.clone_model(fn1)
for variable_1, variable_2 in zip(fn1.trainable_variables,
fn2.trainable_variables):
self.assertEqual(variable_1.shape, variable_2.shape)
if 'kernel' in variable_1.name:
self.assertNotAllClose(tf.keras.backend.eval(variable_1),
tf.keras.backend.eval(variable_2))
self.assertEqual(
len(set(fn1.trainable_variables)
& set(fn2.trainable_variables)), 0)
result_1 = fn1([x, x])
result_1_predict = fn1.predict([x_np, x_np])
result_1_eval = tf.keras.backend.eval(result_1)
result_2 = fn2([x, x])
result_2_predict = fn2.predict([x_np, x_np])
result_2_eval = tf.keras.backend.eval(result_2)
self.assertEqual(fn1.name, fn2.name)
self.assertEqual(result_1_predict.shape, result_2_predict.shape)
self.assertAllEqual(result_1_predict, result_1_eval)
self.assertAllEqual(result_2_predict, result_2_eval)
def create_feedforward_Q_function(input_shapes,
*args,
preprocessors=None,
observation_keys=None,
name='feedforward_Q',
**kwargs):
inputs = create_inputs(input_shapes)
if preprocessors is None:
preprocessors = tree.map_structure(lambda _: None, inputs)
preprocessed_inputs = apply_preprocessors(preprocessors, inputs)
Q_function = feedforward_model(*args, output_size=1, name=name, **kwargs)
Q_function = PicklableModel(inputs, Q_function(preprocessed_inputs))
Q_function.observation_keys = observation_keys
return Q_function
def test_clone_model(self):
"""Make sure that cloning works and clones can predict."""
output_size = 5
x_np = np.random.uniform(0, 1, (1, 13)).astype(np.float32)
x = tf.constant(x_np)
fn1 = feedforward_model(
output_size=output_size,
hidden_layer_sizes=(6, 4, 2),
name='feedforward_function')
result_1 = fn1([x, x])
tf.compat.v1.keras.backend.get_session().run(
tf.compat.v1.global_variables_initializer())
fn2 = tf.keras.models.clone_model(fn1)
result_2 = fn2([x, x])
variable_names = [x.name for x in fn1.variables]
for variable_name, variable_1, variable_2 in zip(
variable_names, fn1.get_weights(), fn2.get_weights()):
self.assertEqual(variable_1.shape, variable_2.shape)
if 'kernel' in variable_name:
self.assertNotAllClose(variable_1, variable_2)
self.assertEqual(
len(set(fn1.trainable_variables)
& set(fn2.trainable_variables)),
0)
with self.assertRaises(ValueError):
# TODO(hartikainen): investigate why this fails
result_1_predict = fn1.predict([x_np, x_np])
result_1_eval = tf.compat.v1.keras.backend.eval(result_1)
result_2_predict = fn2.predict([x_np, x_np])
result_2_eval = tf.compat.v1.keras.backend.eval(result_2)
self.assertEqual(fn1.name, fn2.name)
self.assertEqual(result_1_predict.shape, result_2_predict.shape)
self.assertAllEqual(result_1_predict, result_1_eval)
self.assertAllEqual(result_2_predict, result_2_eval)
def _fn(x, output_units, **condition_kwargs):
"""MLP which concatenates the condition kwargs to input."""
shift_and_log_scale = feedforward_model(
hidden_layer_sizes=hidden_layer_sizes,
output_size=(1 if shift_only else 2) * output_units,
activation=activation,
output_activation=output_activation,
name=name,
)([x, condition_kwargs])
if shift_only:
return shift_and_log_scale, None
shift, log_scale = tf.keras.layers.Lambda(
lambda shift_and_scale: tf.split(shift_and_scale, 2, axis=-1))(
shift_and_log_scale)
return shift, log_scale
def create_distance_estimator(input_shapes,
*args,
preprocessors=None,
observation_keys=None,
goal_keys=None,
name='distance_estimator',
classifier_params=None,
**kwargs):
inputs_flat = create_inputs(input_shapes)
preprocessors_flat = (flatten_input_structure(preprocessors)
if preprocessors is not None else tuple(
None for _ in inputs_flat))
assert len(inputs_flat) == len(preprocessors_flat), (inputs_flat,
preprocessors_flat)
preprocessed_inputs = [
preprocessor(input_) if preprocessor is not None else input_
for preprocessor, input_ in zip(preprocessors_flat, inputs_flat)
]
output_size = 1 if not classifier_params else int(
classifier_params.get('bins', 1) + 1)
distance_fn = feedforward_model(*args,
output_size=output_size,
name=name,
**kwargs)
distance_fn = PicklableModel(inputs_flat, distance_fn(preprocessed_inputs))
# preprocessed_inputs_fn = PicklableModel(inputs_flat, preprocessed_inputs)
distance_fn.observation_keys = observation_keys or tuple()
distance_fn.goal_keys = goal_keys or tuple()
distance_fn.all_keys = distance_fn.observation_keys + distance_fn.goal_keys
distance_fn.classifier_params = classifier_params
# distance_fn.observations_preprocessors = preprocessors['s1']
# distance_fn.preprocessed_inputs_fn = preprocessed_inputs_fn
return distance_fn
def create_feedforward_reward_classifier_function(
input_shapes,
*args,
preprocessors=None,
observation_keys=None,
name='feedforward_reward_classifier',
kernel_regularizer_lambda=1e-3,
# output_activation=tf.math.log_sigmoid,
**kwargs):
inputs_flat = create_inputs(input_shapes)
preprocessors_flat = (flatten_input_structure(preprocessors)
if preprocessors is not None else tuple(
None for _ in inputs_flat))
assert len(inputs_flat) == len(preprocessors_flat), (inputs_flat,
preprocessors_flat)
preprocessed_inputs = [
preprocessor(input_) if preprocessor is not None else input_
for preprocessor, input_ in zip(preprocessors_flat, inputs_flat)
]
reward_classifier_function = feedforward_model(
*args,
output_size=1,
kernel_regularizer=tf.keras.regularizers.l2(kernel_regularizer_lambda)
if kernel_regularizer_lambda else None,
name=name,
# output_activation=output_activation,
**kwargs)
# from IPython import embed; embed()
reward_classifier_function = PicklableModel(
inputs_flat, reward_classifier_function(preprocessed_inputs))
reward_classifier_function.observation_keys = observation_keys
reward_classifier_function.observations_preprocessors = preprocessors
return reward_classifier_function
def test_scoping_reuses_variables_on_single_instance(self):
output_size = 5
x1 = tf.random.uniform((3, 2))
x2 = tf.random.uniform((3, 13))
self.assertFalse(tf.compat.v1.trainable_variables())
fn = feedforward_model(
output_size=output_size,
hidden_layer_sizes=(6, 4, 2),
name='feedforward_function')
self.assertEqual(len(tf.compat.v1.trainable_variables()), 0)
_ = fn([x1, x2])
num_trainable_variables_1 = len(tf.compat.v1.trainable_variables())
self.assertGreater(num_trainable_variables_1, 0)
_ = fn([x2, x1])
num_trainable_variables_2 = len(tf.compat.v1.trainable_variables())
self.assertEqual(num_trainable_variables_1, num_trainable_variables_2)
def test_clone_model(self):
"""Make sure that cloning works and clones can predict."""
output_shape = (5, )
x_np = np.random.uniform(0, 1, (1, 13)).astype(np.float32)
x = tf.constant(x_np)
fn1 = feedforward_model(output_shape=output_shape,
hidden_layer_sizes=(6, 4, 2),
name='feedforward_function')
result_1 = fn1([x, x]).numpy()
fn2 = tf.keras.models.clone_model(fn1)
result_2 = fn2([x, x]).numpy()
variable_names = [x.name for x in fn1.variables]
for variable_name, variable_1, variable_2 in zip(
variable_names, fn1.get_weights(), fn2.get_weights()):
self.assertEqual(variable_1.shape, variable_2.shape)
if 'kernel' in variable_name:
self.assertNotAllClose(variable_1, variable_2)
self.assertEqual(
len(
set((v1.experimental_ref() for v1 in fn1.trainable_variables))
& set((v2.experimental_ref()
for v2 in fn2.trainable_variables))), 0)
result_1_predict = fn1.predict((x_np, x_np))
result_2_predict = fn2.predict((x_np, x_np))
self.assertEqual(fn1.name, fn2.name)
self.assertEqual(result_1_predict.shape, result_2_predict.shape)
self.assertAllEqual(result_1_predict, result_1)
self.assertAllEqual(result_2_predict, result_2)
def convnet_preprocessor(input_shapes,
image_shape,
output_size,
conv_filters=(32, 32),
conv_kernel_sizes=((5, 5), (5, 5)),
pool_type='MaxPool2D',
pool_sizes=((2, 2), (2, 2)),
pool_strides=(2, 2),
dense_hidden_layer_sizes=(64, 64),
data_format='channels_last',
name="convnet_preprocessor",
make_picklable=True,
*args,
**kwargs):
if data_format == 'channels_last':
H, W, C = image_shape
elif data_format == 'channels_first':
C, H, W = image_shape
inputs = [
tf.keras.layers.Input(shape=input_shape)
for input_shape in input_shapes
]
concatenated_input = tf.keras.layers.Lambda(
lambda x: tf.concat(x, axis=-1))(inputs)
images_flat, input_raw = tf.keras.layers.Lambda(
lambda x: [x[..., :H * W * C], x[..., H * W * C:]])(concatenated_input)
images = tf.keras.layers.Reshape(image_shape)(images_flat)
conv_out = images
for filters, kernel_size, pool_size, strides in zip(
conv_filters, conv_kernel_sizes, pool_sizes, pool_strides):
conv_out = tf.keras.layers.Conv2D(filters=filters,
kernel_size=kernel_size,
padding="SAME",
activation=tf.nn.relu,
*args,
**kwargs)(conv_out)
conv_out = getattr(tf.keras.layers,
pool_type)(pool_size=pool_size,
strides=strides)(conv_out)
flattened = tf.keras.layers.Flatten()(conv_out)
concatenated_output = tf.keras.layers.Lambda(
lambda x: tf.concat(x, axis=-1))([flattened, input_raw])
output = (feedforward_model(
input_shapes=(concatenated_output.shape[1:].as_list(), ),
output_size=output_size,
hidden_layer_sizes=dense_hidden_layer_sizes,
activation='relu',
output_activation='linear',
*args,
**kwargs)([concatenated_output])
if dense_hidden_layer_sizes else concatenated_output)
model = PicklableKerasModel(inputs, output, name=name)
return model
def get_feedforward_preprocessor(name='feedforward_preprocessor', **kwargs):
from softlearning.models.feedforward import feedforward_model
preprocessor = feedforward_model(name=name, **kwargs)
return preprocessor
def test_without_name(self):
fn = feedforward_model(
output_size=1,
hidden_layer_sizes=(6, 4, 2))
self.assertEqual(fn.name, 'feedforward_model')