def qnet(observation_space, action_space, net_name, net_size):
num_actions = action_space.n
net_size = int(net_size)
net_name = net_name.lower()
state, feature, net = _atari_state_feature_net(observation_space, net_name)
# dueling or regular dqn/drqn
if 'dueling' in net_name:
value1 = net(net_size, activation='relu')(feature)
adv1 = net(net_size, activation='relu')(feature)
value2 = Dense(1)(value1)
adv2 = Dense(num_actions)(adv1)
mean_adv2 = Lambda(lambda x: K.mean(x, axis=1))(adv2)
ones = K.ones([1, num_actions])
lambda_exp = lambda x: K.dot(K.expand_dims(x, axis=1), -ones)
exp_mean_adv2 = Lambda(lambda_exp)(mean_adv2)
sum_adv = layers.add([exp_mean_adv2, adv2])
exp_value2 = Lambda(lambda x: K.dot(x, ones))(value2)
q_value = layers.add([exp_value2, sum_adv])
else:
hid = net(net_size, activation='relu')(feature)
q_value = Dense(num_actions)(hid)
# build model
return models.Model(inputs=state, outputs=q_value)
def call(self, inputs, **kwargs):
# Return the transpose layer mapping using the explicit weight matrices
output = K.dot(inputs - self.tied_weights[1],
K.transpose(self.tied_weights[0]))
if self.activation is not None:
output = self.activation(output)
return output
def gram_matrix(x):
assert K.ndim(x) == 3
if K.image_data_format() == 'channels_first':
features = K.flatten(x)
else:
features = K.batch_flatten(K.permute_dimensions(x, (2, 0, 1)))
# Dot product of the flattened feature map and the transpose of the
# flattened feature map
gram = K.dot(features, K.transpose(features))
return gram
def call(self, x, **kwargs):
perm_dims = range(len(self.shape))
perm_dims[self.joints_dim], perm_dims[-1] = perm_dims[-1], perm_dims[self.joints_dim]
perm_shape = [int(self.shape[i]) for i in perm_dims]
x = permute_dimensions(x, perm_dims)
x = reshape(x, [np.prod(perm_shape[:-1]), perm_shape[-1]])
x = dot(x, self.comb_matrix)
x = reshape(x, perm_shape)
x = permute_dimensions(x, perm_dims)
return x
def tsne(P, activations):
# d = K.shape(activations)[1]
v = d - 1.
eps = K.variable(
10e-15
) # needs to be at least 10e-8 to get anything after Q /= K.sum(Q)
sum_act = K.sum(K.square(activations), axis=1)
Q = K.reshape(sum_act, [-1, 1]) + -2 * K.dot(activations,
K.transpose(activations))
Q = (sum_act + Q) / v
Q = K.pow(1 + Q, -(v + 1) / 2)
Q *= K.variable(1 - np.eye(n))
Q /= K.sum(Q)
Q = K.maximum(Q, eps)
C = K.log((P + eps) / (Q + eps))
C = K.sum(P * C)
return C
def call(self, x):
output = K.dot(x, self.noisynet_kernel)
output = K.bias_add(output, self.noisynet_bias)
output = self.activation(output)
return output