def __init__(
self,
input_shape,
output_dim,
name,
hidden_sizes=(32, 32),
hidden_nonlinearity=tf.nn.relu,
optimizer=None,
tr_optimizer=None,
use_trust_region=True,
step_size=0.01,
normalize_inputs=True,
no_initial_trust_region=True,
):
"""
:param input_shape: Shape of the input data.
:param output_dim: Dimension of output.
:param hidden_sizes: Number of hidden units of each layer of the mean network.
:param hidden_nonlinearity: Non-linearity used for each layer of the mean network.
:param optimizer: Optimizer for minimizing the negative log-likelihood.
:param use_trust_region: Whether to use trust region constraint.
:param step_size: KL divergence constraint for each iteration
"""
Serializable.quick_init(self, locals())
with tf.variable_scope(name):
if optimizer is None:
optimizer = LbfgsOptimizer(name="optimizer")
if tr_optimizer is None:
tr_optimizer = ConjugateGradientOptimizer()
self.output_dim = output_dim
self.optimizer = optimizer
self.tr_optimizer = tr_optimizer
p_network = MLP(input_shape=input_shape,
output_dim=output_dim,
hidden_sizes=hidden_sizes,
hidden_nonlinearity=hidden_nonlinearity,
output_nonlinearity=tf.nn.sigmoid,
name="p_network")
l_p = p_network.output_layer
LayersPowered.__init__(self, [l_p])
xs_var = p_network.input_layer.input_var
ys_var = tf.placeholder(dtype=tf.float32,
shape=(None, output_dim),
name="ys")
old_p_var = tf.placeholder(dtype=tf.float32,
shape=(None, output_dim),
name="old_p")
x_mean_var = tf.get_variable(name="x_mean",
initializer=tf.zeros_initializer,
shape=(1, ) + input_shape)
x_std_var = tf.get_variable(name="x_std",
initializer=tf.ones_initializer,
shape=(1, ) + input_shape)
normalized_xs_var = (xs_var - x_mean_var) / x_std_var
p_var = L.get_output(l_p,
{p_network.input_layer: normalized_xs_var})
old_info_vars = dict(p=old_p_var)
info_vars = dict(p=p_var)
dist = self._dist = Bernoulli(output_dim)
mean_kl = tf.reduce_mean(dist.kl_sym(old_info_vars, info_vars))
loss = -tf.reduce_mean(dist.log_likelihood_sym(ys_var, info_vars))
predicted = p_var >= 0.5
self.f_predict = tensor_utils.compile_function([xs_var], predicted)
self.f_p = tensor_utils.compile_function([xs_var], p_var)
self.l_p = l_p
self.optimizer.update_opt(loss=loss,
target=self,
network_outputs=[p_var],
inputs=[xs_var, ys_var])
self.tr_optimizer.update_opt(loss=loss,
target=self,
network_outputs=[p_var],
inputs=[xs_var, ys_var, old_p_var],
leq_constraint=(mean_kl, step_size))
self.use_trust_region = use_trust_region
self.name = name
self.normalize_inputs = normalize_inputs
self.x_mean_var = x_mean_var
self.x_std_var = x_std_var
self.first_optimized = not no_initial_trust_region
def __init__(
self,
name,
input_shape,
output_dim,
prob_network=None,
hidden_sizes=(32, 32),
hidden_nonlinearity=tf.nn.tanh,
optimizer=None,
tr_optimizer=None,
use_trust_region=True,
step_size=0.01,
normalize_inputs=True,
no_initial_trust_region=True,
):
"""
:param input_shape: Shape of the input data.
:param output_dim: Dimension of output.
:param hidden_sizes: Number of hidden units of each layer of the mean network.
:param hidden_nonlinearity: Non-linearity used for each layer of the mean network.
:param optimizer: Optimizer for minimizing the negative log-likelihood.
:param use_trust_region: Whether to use trust region constraint.
:param step_size: KL divergence constraint for each iteration
"""
Serializable.quick_init(self, locals())
with tf.variable_scope(name):
if optimizer is None:
optimizer = LbfgsOptimizer(name="optimizer")
if tr_optimizer is None:
tr_optimizer = ConjugateGradientOptimizer()
self.input_dim = input_shape[0]
self.observation_space = Discrete(self.input_dim)
self.action_space = Discrete(output_dim)
self.output_dim = output_dim
self.optimizer = optimizer
self.tr_optimizer = tr_optimizer
if prob_network is None:
prob_network = MLP(
input_shape=input_shape,
output_dim=output_dim,
hidden_sizes=hidden_sizes,
hidden_nonlinearity=hidden_nonlinearity,
output_nonlinearity=tf.nn.softmax,
name="prob_network"
)
l_prob = prob_network.output_layer
LayersPowered.__init__(self, [l_prob])
xs_var = prob_network.input_layer.input_var
ys_var = tf.placeholder(dtype=tf.float32, shape=[None, output_dim], name="ys")
old_prob_var = tf.placeholder(dtype=tf.float32, shape=[None, output_dim], name="old_prob")
x_mean_var = tf.get_variable(
name="x_mean",
shape=(1,) + input_shape,
initializer=tf.constant_initializer(0., dtype=tf.float32)
)
x_std_var = tf.get_variable(
name="x_std",
shape=(1,) + input_shape,
initializer=tf.constant_initializer(1., dtype=tf.float32)
)
self.x_mean_var = x_mean_var
self.x_std_var = x_std_var
normalized_xs_var = (xs_var - x_mean_var) / x_std_var
prob_var = L.get_output(l_prob, {prob_network.input_layer: normalized_xs_var})
old_info_vars = dict(prob=old_prob_var)
info_vars = dict(prob=prob_var)
dist = self._dist = Categorical(output_dim)
mean_kl = tf.reduce_mean(dist.kl_sym(old_info_vars, info_vars))
loss = - tf.reduce_mean(dist.log_likelihood_sym(ys_var, info_vars))
predicted = tensor_utils.to_onehot_sym(tf.argmax(prob_var, axis=1), output_dim)
self.prob_network = prob_network
self.f_predict = tensor_utils.compile_function([xs_var], predicted)
self.f_prob = tensor_utils.compile_function([xs_var], prob_var)
self.l_prob = l_prob
self.optimizer.update_opt(loss=loss, target=self, network_outputs=[prob_var], inputs=[xs_var, ys_var])
self.tr_optimizer.update_opt(loss=loss, target=self, network_outputs=[prob_var],
inputs=[xs_var, ys_var, old_prob_var],
leq_constraint=(mean_kl, step_size)
)
self.use_trust_region = use_trust_region
self.name = name
self.normalize_inputs = normalize_inputs
self.x_mean_var = x_mean_var
self.x_std_var = x_std_var
self.first_optimized = not no_initial_trust_region
def __init__(
self,
name,
input_shape,
output_dim,
# observation_space,
mean_network=None,
hidden_sizes=(32, 32),
hidden_nonlinearity=tf.nn.tanh,
optimizer=None,
use_trust_region=True,
step_size=0.01,
learn_std=True,
init_std=1.0,
adaptive_std=False,
std_share_network=False,
std_hidden_sizes=(32, 32),
std_nonlinearity=None,
normalize_inputs=True,
normalize_outputs=True,
subsample_factor=1.0
):
"""
:param input_shape: Shape of the input data.
:param output_dim: Dimension of output.
:param hidden_sizes: Number of hidden units of each layer of the mean network.
:param hidden_nonlinearity: Non-linearity used for each layer of the mean network.
:param optimizer: Optimizer for minimizing the negative log-likelihood.
:param use_trust_region: Whether to use trust region constraint.
:param step_size: KL divergence constraint for each iteration
:param learn_std: Whether to learn the standard deviations. Only effective if adaptive_std is False. If
adaptive_std is True, this parameter is ignored, and the weights for the std network are always learned.
:param adaptive_std: Whether to make the std a function of the states.
:param std_share_network: Whether to use the same network as the mean.
:param std_hidden_sizes: Number of hidden units of each layer of the std network. Only used if
`std_share_network` is False. It defaults to the same architecture as the mean.
:param std_nonlinearity: Non-linearity used for each layer of the std network. Only used if `std_share_network`
is False. It defaults to the same non-linearity as the mean.
"""
Serializable.quick_init(self, locals())
with tf.variable_scope(name):
if optimizer is None:
if use_trust_region:
optimizer = PenaltyLbfgsOptimizer("optimizer")
else:
optimizer = LbfgsOptimizer("optimizer")
self._optimizer = optimizer
self._subsample_factor = subsample_factor
if mean_network is None:
mean_network = MLP(
name="mean_network",
input_shape=input_shape,
output_dim=output_dim,
hidden_sizes=hidden_sizes,
hidden_nonlinearity=hidden_nonlinearity,
output_nonlinearity=None,
)
l_mean = mean_network.output_layer
if adaptive_std:
l_log_std = MLP(
name="log_std_network",
input_shape=input_shape,
input_var=mean_network.input_layer.input_var,
output_dim=output_dim,
hidden_sizes=std_hidden_sizes,
hidden_nonlinearity=std_nonlinearity,
output_nonlinearity=None,
).output_layer
else:
l_log_std = L.ParamLayer(
mean_network.input_layer,
num_units=output_dim,
param=tf.constant_initializer(np.log(init_std)),
name="output_log_std",
trainable=learn_std,
)
LayersPowered.__init__(self, [l_mean, l_log_std])
xs_var = mean_network.input_layer.input_var
ys_var = tf.placeholder(dtype=tf.float32, name="ys", shape=(None, output_dim))
old_means_var = tf.placeholder(dtype=tf.float32, name="ys", shape=(None, output_dim))
old_log_stds_var = tf.placeholder(dtype=tf.float32, name="old_log_stds", shape=(None, output_dim))
x_mean_var = tf.Variable(
np.zeros((1,) + input_shape, dtype=np.float32),
name="x_mean",
)
x_std_var = tf.Variable(
np.ones((1,) + input_shape, dtype=np.float32),
name="x_std",
)
y_mean_var = tf.Variable(
np.zeros((1, output_dim), dtype=np.float32),
name="y_mean",
)
y_std_var = tf.Variable(
np.ones((1, output_dim), dtype=np.float32),
name="y_std",
)
self.x_mean_var = x_mean_var
self.x_std_var = x_std_var
self.y_mean_var = y_mean_var
self.y_std_var = y_std_var
# self.observation_space = observation_space
normalized_xs_var = (xs_var - x_mean_var) / x_std_var
normalized_ys_var = (ys_var - y_mean_var) / y_std_var
normalized_means_var = L.get_output(l_mean, {mean_network.input_layer: normalized_xs_var})
normalized_log_stds_var = L.get_output(l_log_std, {mean_network.input_layer: normalized_xs_var})
means_var = normalized_means_var * y_std_var + y_mean_var
log_stds_var = normalized_log_stds_var + tf.log(y_std_var)
normalized_old_means_var = (old_means_var - y_mean_var) / y_std_var
normalized_old_log_stds_var = old_log_stds_var - tf.log(y_std_var)
dist = self._dist = DiagonalGaussian(output_dim)
normalized_dist_info_vars = dict(mean=normalized_means_var, log_std=normalized_log_stds_var)
mean_kl = tf.reduce_mean(dist.kl_sym(
dict(mean=normalized_old_means_var, log_std=normalized_old_log_stds_var),
normalized_dist_info_vars,
))
loss = - tf.reduce_mean(dist.log_likelihood_sym(normalized_ys_var, normalized_dist_info_vars))
self._f_predict = tensor_utils.compile_function([xs_var], means_var)
self._f_pdists = tensor_utils.compile_function([xs_var], [means_var, log_stds_var])
self._l_mean = l_mean
self._l_log_std = l_log_std
optimizer_args = dict(
loss=loss,
target=self,
network_outputs=[normalized_means_var, normalized_log_stds_var],
)
if use_trust_region:
optimizer_args["leq_constraint"] = (mean_kl, step_size)
optimizer_args["inputs"] = [xs_var, ys_var, old_means_var, old_log_stds_var]
else:
optimizer_args["inputs"] = [xs_var, ys_var]
self._optimizer.update_opt(**optimizer_args)
self._use_trust_region = use_trust_region
self._name = name
self._normalize_inputs = normalize_inputs
self._normalize_outputs = normalize_outputs
self._mean_network = mean_network
self._x_mean_var = x_mean_var
self._x_std_var = x_std_var
self._y_mean_var = y_mean_var
self._y_std_var = y_std_var
self.input_dim = input_shape[0]
self.output_dim = output_dim
def __init__(
self,
name,
input_shape,
output_dim,
network=None,
hidden_sizes=(32, 32),
hidden_nonlinearity=tf.nn.tanh,
output_nonlinearity=None,
optimizer=None,
normalize_inputs=True,
):
"""
:param input_shape: Shape of the input data.
:param output_dim: Dimension of output.
:param hidden_sizes: Number of hidden units of each layer of the mean network.
:param hidden_nonlinearity: Non-linearity used for each layer of the mean network.
:param optimizer: Optimizer for minimizing the negative log-likelihood.
"""
Serializable.quick_init(self, locals())
with tf.variable_scope(name):
if optimizer is None:
optimizer = LbfgsOptimizer(name="optimizer")
self.output_dim = output_dim
self.optimizer = optimizer
if network is None:
network = MLP(input_shape=input_shape,
output_dim=output_dim,
hidden_sizes=hidden_sizes,
hidden_nonlinearity=hidden_nonlinearity,
output_nonlinearity=output_nonlinearity,
name="network")
l_out = network.output_layer
LayersPowered.__init__(self, [l_out])
xs_var = network.input_layer.input_var
ys_var = tf.placeholder(dtype=tf.float32,
shape=[None, output_dim],
name="ys")
x_mean_var = tf.get_variable(name="x_mean",
shape=(1, ) + input_shape,
initializer=tf.constant_initializer(
0., dtype=tf.float32))
x_std_var = tf.get_variable(name="x_std",
shape=(1, ) + input_shape,
initializer=tf.constant_initializer(
1., dtype=tf.float32))
normalized_xs_var = (xs_var - x_mean_var) / x_std_var
fit_ys_var = L.get_output(l_out,
{network.input_layer: normalized_xs_var})
loss = -tf.reduce_mean(tf.square(fit_ys_var - ys_var))
self.f_predict = tensor_utils.compile_function([xs_var],
fit_ys_var)
optimizer_args = dict(
loss=loss,
target=self,
network_outputs=[fit_ys_var],
)
optimizer_args["inputs"] = [xs_var, ys_var]
self.optimizer.update_opt(**optimizer_args)
self.name = name
self.l_out = l_out
self.normalize_inputs = normalize_inputs
self.x_mean_var = x_mean_var
self.x_std_var = x_std_var
def __init__(
self,
name,
input_shape,
output_dim,
mean_network=None,
hidden_sizes=(32, 32),
hidden_nonlinearity=tf.nn.tanh,
output_nonlinearity=lambda x: x * 0.0 + tf.Variable(
initial_value=-1.0, dtype=tf.float32),
# output_nonlinearity=tf.identity,
optimizer=None,
use_trust_region=True,
step_size=0.01,
learn_std=True,
init_std=1.0,
adaptive_std=False,
std_share_network=False,
std_hidden_sizes=(32, 32),
std_nonlinearity=None,
normalize_inputs=True,
normalize_outputs=True,
subsample_factor=1.0):
"""
:param input_shape: Shape of the input data.
:param output_dim: Dimension of output.
:param hidden_sizes: Number of hidden units of each layer of the mean network.
:param hidden_nonlinearity: Non-linearity used for each layer of the mean network.
:param optimizer: Optimizer for minimizing the negative log-likelihood.
:param use_trust_region: Whether to use trust region constraint.
:param step_size: KL divergence constraint for each iteration
:param learn_std: Whether to learn the standard deviations. Only effective if adaptive_std is False. If
adaptive_std is True, this parameter is ignored, and the weights for the std network are always learned.
:param adaptive_std: Whether to make the std a function of the states.
:param std_share_network: Whether to use the same network as the mean.
:param std_hidden_sizes: Number of hidden units of each layer of the std network. Only used if
`std_share_network` is False. It defaults to the same architecture as the mean.
:param std_nonlinearity: Non-linearity used for each layer of the std network. Only used if `std_share_network`
is False. It defaults to the same non-linearity as the mean.
"""
Serializable.quick_init(self, locals())
with tf.variable_scope(name):
if optimizer is None:
if use_trust_region:
optimizer = PenaltyLbfgsOptimizer("optimizer")
else:
optimizer = LbfgsOptimizer("optimizer")
self._optimizer = optimizer
self._subsample_factor = subsample_factor
if mean_network is None:
mean_network = create_MLP(
name="mean_network",
output_dim=1,
hidden_sizes=hidden_sizes,
hidden_nonlinearity=hidden_nonlinearity,
output_nonlinearity=output_nonlinearity,
)
forward_mean = lambda x, params, is_train: self.forward_MLP(
'mean_network',
all_params=params,
input_tensor=x,
is_training=is_train)[1]
else:
raise NotImplementedError('Not supported.')
# print("Debug2, mean network is defined here")
# mean_network = L.ParamLayer(
# incoming=L.InputLayer(
# shape=(None,) + input_shape,
# name="input_layer"),
# num_units=1,
# param=tf.constant_initializer(-200.0),
# name="mean_network",
# trainable=True,
# ),
# print(mean_network.input_layer)
# print("debug4", isinstance(L.InputLayer(
# shape=(None,) + input_shape,
# name="input_layer"), tuple))
#
# l_mean = mean_network
# mean_network = MLP(
# name="mean_network",
# input_shape=input_shape,
# output_dim=output_dim,
# hidden_sizes=hidden_sizes,
# hidden_nonlinearity=hidden_nonlinearity,
# output_nonlinearity=output_nonlinearity,
# )
#
# l_mean = mean_network.output_layer
if adaptive_std:
# l_log_std = MLP(
# name="log_std_network",
# input_shape=input_shape,
# input_var=mean_network.input_layer.input_var,
# output_dim=output_dim,
# hidden_sizes=std_hidden_sizes,
# hidden_nonlinearity=std_nonlinearity,
# output_nonlinearity=None,
# ).output_layer
raise NotImplementedError('Not supported.')
else:
# l_log_std = L.ParamLayer(
# mean_network.input_layer,
# num_units=output_dim,
# param=tf.constant_initializer(np.log(init_std)),
# name="output_log_std",
# trainable=learn_std,
# )
self.all_params['std_param'] = make_param_layer(
num_units=1,
param=tf.constant_initializer(init_std),
name="output_std_param",
trainable=learn_std,
)
forward_std = lambda x, params: forward_param_layer(
x, params['std_param'])
self.all_param_vals = None
LayersPowered.__init__(self, [l_mean, l_log_std])
xs_var = mean_network.input_layer.input_var
ys_var = tf.placeholder(dtype=tf.float32,
name="ys",
shape=(None, output_dim))
old_means_var = tf.placeholder(dtype=tf.float32,
name="ys",
shape=(None, output_dim))
old_log_stds_var = tf.placeholder(dtype=tf.float32,
name="old_log_stds",
shape=(None, output_dim))
x_mean_var = tf.Variable(
np.zeros((1, ) + input_shape, dtype=np.float32),
name="x_mean",
)
x_std_var = tf.Variable(
np.ones((1, ) + input_shape, dtype=np.float32),
name="x_std",
)
y_mean_var = tf.Variable(
np.zeros((1, output_dim), dtype=np.float32),
name="y_mean",
)
y_std_var = tf.Variable(
np.ones((1, output_dim), dtype=np.float32),
name="y_std",
)
normalized_xs_var = (xs_var - x_mean_var) / x_std_var
normalized_ys_var = (ys_var - y_mean_var) / y_std_var
normalized_means_var = L.get_output(
l_mean, {mean_network.input_layer: normalized_xs_var})
normalized_log_stds_var = L.get_output(
l_log_std, {mean_network.input_layer: normalized_xs_var})
means_var = normalized_means_var * y_std_var + y_mean_var
log_stds_var = normalized_log_stds_var + tf.log(y_std_var)
normalized_old_means_var = (old_means_var - y_mean_var) / y_std_var
normalized_old_log_stds_var = old_log_stds_var - tf.log(y_std_var)
## code added for symbolic prediction, used in constructing the meta-learning objective
def normalized_means_var_sym(xs, params):
inputs = OrderedDict({mean_network.input_layer: xs})
inputs.update(params)
return L.get_output(layer_or_layers=l_mean, inputs=inputs)
# normalized_means_var_sym = lambda xs, params: L.get_output(layer_or_layers=l_mean, inputs=OrderedDict({mean_network.input_layer:xs}.) #mean_network.input_layer: (xs-x_mean_var)/x_std_var,
# normalized_log_stds_var_sym = L.get_output(l_log_std, {mean_network.input_layer: normalized_xs_var})
means_var_sym = lambda xs, params: normalized_means_var_sym(
xs=xs, params=params) * y_std_var + y_mean_var
# log_stds_var = normalized_log_stds_var + tf.log(y_std_var)
dist = self._dist = DiagonalGaussian(output_dim)
normalized_dist_info_vars = dict(mean=normalized_means_var,
log_std=normalized_log_stds_var)
mean_kl = tf.reduce_mean(
dist.kl_sym(
dict(mean=normalized_old_means_var,
log_std=normalized_old_log_stds_var),
normalized_dist_info_vars,
))
# loss = - tf.reduce_mean(dist.log_likelihood_sym(normalized_ys_var, normalized_dist_info_vars))
loss = tf.nn.l2_loss(normalized_ys_var - normalized_means_var
) + tf.nn.l2_loss(normalized_log_stds_var)
self._f_predict = tensor_utils.compile_function([xs_var],
means_var)
self._f_pdists = tensor_utils.compile_function(
[xs_var], [means_var, log_stds_var])
self._l_mean = l_mean
self._l_log_std = l_log_std
self._f_predict_sym = means_var_sym
self.loss_sym = loss
optimizer_args = dict(
loss=loss,
target=self,
network_outputs=[
normalized_means_var, normalized_log_stds_var
],
)
if use_trust_region:
optimizer_args["leq_constraint"] = (mean_kl, step_size)
optimizer_args["inputs"] = [
xs_var, ys_var, old_means_var, old_log_stds_var
]
else:
optimizer_args["inputs"] = [xs_var, ys_var]
self._optimizer.update_opt(**optimizer_args)
self._use_trust_region = use_trust_region
self._name = name
self._normalize_inputs = normalize_inputs
self._normalize_outputs = normalize_outputs
self._mean_network = mean_network
self._x_mean_var = x_mean_var
self._x_std_var = x_std_var
self._y_mean_var = y_mean_var
self._y_std_var = y_std_var
