def __init__(self, layers_info, output_activation=None, hidden_activations="relu", dropout= 0.0, initialiser="default",
batch_norm=False, y_range=(), random_seed=0, input_dim=None):
Model.__init__(self)
self.valid_cnn_hidden_layer_types = {'conv', 'maxpool', 'avgpool', 'linear'}
self.valid_layer_types_with_no_parameters = (MaxPool2D, AveragePooling2D)
Base_Network.__init__(self, layers_info, output_activation, hidden_activations, dropout, initialiser,
batch_norm, y_range, random_seed, input_dim)
def __init__(self, layers_info: list, output_activation=None, input_dim=None,
hidden_activations="relu", dropout: float =0.0, initialiser: str ="default", batch_norm: bool =False,
columns_of_data_to_be_embedded: list =[], embedding_dimensions: list =[], y_range: tuple = (),
random_seed=0, print_model_summary: bool =False):
Model.__init__(self)
self.embedding_to_occur = len(columns_of_data_to_be_embedded) > 0
self.columns_of_data_to_be_embedded = columns_of_data_to_be_embedded
self.embedding_dimensions = embedding_dimensions
self.embedding_layers = self.create_embedding_layers()
TensorFlow_Base_Network.__init__(self, input_dim, layers_info, output_activation,
hidden_activations, dropout, initialiser, batch_norm, y_range, random_seed,
print_model_summary)
def __init__(self, num_head,
mu_shared_nodes, mu_branched_nodes=None,
sigma_shared_nodes=None, sigma_branched_nodes=None,
learning_rate=0.001, lr_decay_step=None, lr_decay_rate=None,
single_head_multi_out=False):
Model.__init__(self)
self.gaussian_layer = BranchedMultiHeadGaussianMLP(num_head,
mu_shared_nodes, mu_branched_nodes=mu_branched_nodes,
sigma_shared_nodes=sigma_shared_nodes, sigma_branched_nodes=sigma_branched_nodes,
single_head_multi_out=single_head_multi_out)
self.learning_rate = tf.Variable(learning_rate, trainable=False)
self.lr_decay_step = lr_decay_step
self.lr_decay_rate = lr_decay_rate
self.optimizer = tf.keras.optimizers.RMSprop(self.learning_rate)
def __init__(self,
layers_info,
output_activation=None,
hidden_activations="relu",
dropout=0.0,
initialiser="default",
batch_norm=False,
columns_of_data_to_be_embedded=[],
embedding_dimensions=[],
y_range=(),
random_seed=0,
input_dim=None):
Model.__init__(self)
self.embedding_to_occur = len(columns_of_data_to_be_embedded) > 0
self.columns_of_data_to_be_embedded = columns_of_data_to_be_embedded
self.embedding_dimensions = embedding_dimensions
self.embedding_layers = self.create_embedding_layers()
Base_Network.__init__(self, layers_info, output_activation,
hidden_activations, dropout, initialiser,
batch_norm, y_range, random_seed, input_dim)
def __init__(self,
layers_info,
output_activation=None,
hidden_activations="relu",
dropout=0.0,
initialiser="default",
batch_norm=False,
columns_of_data_to_be_embedded=[],
embedding_dimensions=[],
y_range=(),
return_final_seq_only=True,
random_seed=0,
input_dim=None):
Model.__init__(self)
self.embedding_to_occur = len(columns_of_data_to_be_embedded) > 0
self.columns_of_data_to_be_embedded = columns_of_data_to_be_embedded
self.embedding_dimensions = embedding_dimensions
self.embedding_layers = self.create_embedding_layers()
self.return_final_seq_only = return_final_seq_only
self.valid_RNN_hidden_layer_types = {"linear", "gru", "lstm"}
Base_Network.__init__(self, layers_info, output_activation,
hidden_activations, dropout, initialiser,
batch_norm, y_range, random_seed, input_dim)
def __init__(
self,
x_dim,
y_dim,
f_i_embedder_fn,
r_ik_embedder_fn,
predictor_fn,
updater_fn,
xy_embedder_fn,
x_embedder_fn,
L,
num_encoder_decoder_stack,
i_dim_reduction=0,
o_dim_reduction=0,
dot_product_attention_scale=False,
max_grad_norm=0,
entropy_lambda=0,
learning_rate=1e-3,
alter_psi=False,
):
Model.__init__(self)
self.L = L
self.alter_psi = alter_psi
self.f_i_embedder = f_i_embedder_fn()
self.r_ik_embedder = r_ik_embedder_fn()
self.predictor = predictor_fn(y_dim=y_dim)
self.xy_embedder = xy_embedder_fn()
self.xq_embedder = x_embedder_fn()
self.encoder = [M.attention.Encoder() for _ in range(num_encoder_decoder_stack)]
self.decoder = [M.attention.Decoder() for _ in range(num_encoder_decoder_stack)]
self.encoder_decoder = [(e,d) for e,d in zip(self.encoder,self.decoder)]
self.i_transform = Dense(i_dim_reduction,use_bias=False) if i_dim_reduction > 0 else None
self.o_transform = Dense(o_dim_reduction,use_bias=False) if o_dim_reduction > 0 else None
self.dot_product_attention_scale = dot_product_attention_scale
self.updater = updater_fn()
self.optimizer = tf.keras.optimizers.Adam(learning_rate)
self.train_loss = tf.keras.metrics.Mean(name='train_loss')
self.grad_norm = tf.keras.metrics.Mean(name='grad_norm')
self.entropy = tf.keras.metrics.Mean(name='entropy')
self.reports = {
'loss': self.train_loss,
'grad_norm': self.grad_norm,
'entropy': self.entropy,
}
@tf.function(input_signature=(
tf.TensorSpec(shape=[None,None,x_dim],dtype=tf.float32),
tf.TensorSpec(shape=[None,None,y_dim],dtype=tf.float32),
tf.TensorSpec(shape=[None,None,x_dim],dtype=tf.float32),
tf.TensorSpec(shape=[None,None,y_dim],dtype=tf.float32)))
def update(x,y,q,a):
with tf.GradientTape() as tape:
if isinstance(self.predictor,M.ProbabilisticPrediction):
a_hat, dist = self((x,y,q),training=True)
loss = tf.reduce_mean(-1. * dist.log_prob(a))
entropy = tf.reduce_mean(dist.mixture_distribution.entropy())
self.entropy(entropy)
if entropy_lambda > 0:
loss += entropy_lambda * entropy
else:
a_hat, dist = self((x,y,q),training=True)
loss = tf.reduce_mean(tf.reduce_sum(0.5 * (a - a_hat) ** 2,axis=-1))
if dist is not None:
entropy = tf.reduce_mean(dist.mixture_distribution.entropy())
self.entropy(entropy)
gradients = tape.gradient(loss, self.trainable_variables)
gradients_clipped, grad_norm = tf.clip_by_global_norm(gradients, max_grad_norm)
self.grad_norm(grad_norm)
if max_grad_norm > 0:
gradients = gradients_clipped
self.optimizer.apply_gradients(zip(gradients, self.trainable_variables))
self.train_loss(loss)
self.update = update