class LELPPO(Layer):
def __init__(self, input_shape, pool_shape, nactions, name=None):
self.input_shape = input_shape
self.batch_size, self.h, self.w, self.fin = self.input_shape
self.pool_shape = pool_shape
self.nactions = nactions
self.name = name
self.action_name = self.name + '_action'
self.value_name = self.name + '_value'
self.nlp_name = self.name + '_nlp'
self.pool = AvgPool(size=self.input_shape,
ksize=self.pool_shape,
strides=self.pool_shape,
padding='SAME')
l2_input_shape = l1.output_shape()
self.conv2fc = ConvToFullyConnected(input_shape=l2_input_shape)
l3_input_shape = l2.output_shape()
self.actions = FullyConnected(input_shape=l3_input_shape,
size=self.nactions,
init='alexnet',
name=self.name + '_actions')
self.values = FullyConnected(input_shape=l3_input_shape,
size=1,
init='alexnet',
name=self.name + '_values')
####################################################
self.logits_bias = tf.Variable(np.zeros(shape=(self.nbatch,
self.nclass)),
dtype=tf.float32)
self.values_bias = tf.Variable(np.zeros(shape=(self.nbatch, 1)),
dtype=tf.float32)
# self.actions_model = Model(layers=[l1, l2, actions])
# self.values_model = Model(layers=[l1, l2, values])
####################################################
self.advantages = tf.placeholder("float", [None])
self.rewards = tf.placeholder("float", [None])
self.old_actions = tf.placeholder("int32", [None])
self.old_values = tf.placeholder("float", [None])
self.old_nlps = tf.placeholder("float", [None])
####################################################
def get_weights(self):
return []
def output_shape(self):
return self.input_shape
def num_params(self):
return 0
def place_holders(self):
place_holders_dict = {}
place_holders_dict[self.name + '_advantages'] = self.advantages
place_holders_dict[self.name + '_rewards'] = self.rewards
place_holders_dict[self.name + '_old_actions'] = self.old_actions
place_holders_dict[self.name + '_old_values'] = self.old_values
place_holders_dict[self.name + '_old_nlps'] = self.old_nlps
return place_holders_dict
###################################################################
def forward(self, X):
return X
def predict(self, X):
# [logits, logits_forward] = self.actions_model.forward(X)
# [values, values_forward] = self.values_model.forward(X)
pool = self.pool.forward(AI)
conv2fc = self.conv2fc.forward(pool)
logits = self.actions.forward(conv2fc)
values = self.values.forward(conv2fc)
values = tf.reshape(values, (-1, ))
actions = sample(logits)
nlps = neg_log_prob(logits, actions)
# states, rewards, advantages, old_actions, old_values, old_nlps
cache = {
self.action_name: actions,
self.value_name: values,
self.nlp_name: nlps
}
return X, cache
###################################################################
def backward(self, AI, AO, DO):
return DO
def gv(self, AI, AO, DO):
return []
###################################################################
def dfa_backward(self, AI, AO, E, DO):
return DO
def dfa_gv(self, AI, AO, E, DO):
return []
###################################################################
def lel_backward(self, AI, AO, DO, cache):
pool = self.pool.forward(AI)
conv2fc = self.conv2fc.forward(pool)
logits = self.actions.forward(conv2fc)
values = self.values.forward(conv2fc)
# [logits, logits_forward] = self.actions_model.forward(AI)
# [values, values_forward] = self.values_model.forward(AI)
logits = logits + self.logits_bias
values = values + self.values_bias
values = tf.reshape(values, (-1, ))
nlps = neg_log_prob(logits, self.old_actions)
ratio = tf.exp(nlps - self.old_nlps)
ratio = tf.clip_by_value(ratio, 0, 10)
surr1 = self.advantages * ratio
surr2 = self.advantages * tf.clip_by_value(ratio, 1 - epsilon_decay,
1 + epsilon_decay)
policy_loss = -tf.reduce_mean(tf.minimum(surr1, surr2))
entropy_loss = -policy_entropy(train)
clipped_value_estimate = self.old_values + tf.clip_by_value(
values - self.old_values, -epsilon_decay, epsilon_decay)
value_loss_1 = tf.squared_difference(clipped_value_estimate,
self.rewards)
value_loss_2 = tf.squared_difference(values, self.rewards)
value_loss = 0.5 * tf.reduce_mean(
tf.maximum(value_loss_1, value_loss_2))
###################################################################
loss = policy_loss + 0.01 * entropy_loss + 1. * value_loss
# grads = tf.gradients(self.loss, [self.logits_bias, self.values_bias] + self.params)
grads = tf.gradients(self.loss, [self.logits_bias, self.values_bias])
do_logits = grads[0]
do_values = grads[1]
# we never call forward in lel, until backwards... forward just returns X.
# actually works out nicely.
# perhaps we dont actually need a cache then.
# a few cheap redundant computations isnt so bad.
dlogits = self.actions.backward(conv2fc, logits, do_logits)
dvalues = self.values.backward(conv2fc, values, do_values)
dconv2fc = self.conv2fc.backward(pool, conv2fc, dlogits + dvalues)
dpool = self.pool.backward(AI, pool, dconv2fc)
return dpool
def lel_gv(self, AI, AO, DO, cache):
pool = self.pool.forward(AI)
conv2fc = self.conv2fc.forward(pool)
logits = self.actions.forward(conv2fc)
values = self.values.forward(conv2fc)
# [logits, logits_forward] = self.actions_model.forward(AI)
# [values, values_forward] = self.values_model.forward(AI)
logits = logits + self.logits_bias
values = values + self.values_bias
values = tf.reshape(values, (-1, ))
nlps = neg_log_prob(logits, self.old_actions)
ratio = tf.exp(nlps - self.old_nlps)
ratio = tf.clip_by_value(ratio, 0, 10)
surr1 = self.advantages * ratio
surr2 = self.advantages * tf.clip_by_value(ratio, 1 - epsilon_decay,
1 + epsilon_decay)
policy_loss = -tf.reduce_mean(tf.minimum(surr1, surr2))
entropy_loss = -policy_entropy(train)
clipped_value_estimate = self.old_values + tf.clip_by_value(
values - self.old_values, -epsilon_decay, epsilon_decay)
value_loss_1 = tf.squared_difference(clipped_value_estimate,
self.rewards)
value_loss_2 = tf.squared_difference(values, self.rewards)
value_loss = 0.5 * tf.reduce_mean(
tf.maximum(value_loss_1, value_loss_2))
###################################################################
loss = policy_loss + 0.01 * entropy_loss + 1. * value_loss
# grads = tf.gradients(self.loss, [self.logits_bias, self.values_bias] + self.params)
grads = tf.gradients(self.loss, [self.logits_bias, self.values_bias])
do_logits = grads[0]
do_values = grads[1]
# we never call forward in lel, until backwards... forward just returns X.
# actually works out nicely.
# perhaps we dont actually need a cache then.
# a few cheap redundant computations isnt so bad.
gvs = []
dlogits = self.actions.gv(conv2fc, logits, do_logits)
dvalues = self.values.gv(conv2fc, values, do_values)
# dconv2fc = self.conv2fc.backward(pool, conv2fc, dlogits + dvalues)
# dpool = self.pool.backward(AI, pool, dconv2fc)
gvs.extend(dlogits, dvalues)
return gvs
class LELFC(Layer):
def __init__(self, input_shape, num_classes, name=None):
self.num_classes = num_classes
self.input_shape = input_shape
self.name = name
'''
if load:
weight_dict = np.load(load).item()
self.B = tf.cast(tf.Variable(weight_dict[self.name]), tf.float32)
elif std is not None:
b = np.random.normal(loc=0., scale=std, size=(self.num_classes, self.output_size))
self.B = tf.cast(tf.Variable(b), tf.float32)
else:
# var = 1. / self.output_size
# std = np.sqrt(var)
# b = np.random.normal(loc=0., scale=std, size=(self.num_classes, self.output_size))
b = FeedbackMatrix(size=(self.num_classes, self.output_size), sparse=self.sparse, rank=self.rank)
self.B = tf.cast(tf.Variable(b), tf.float32)
'''
# THE PROBLEM WAS NEVER THE BIAS ... IT WAS THE FACT WE WERNT DIVIDING BY N
# l0 = FullyConnected(input_shape=input_shape, size=self.input_shape, init='alexnet', activation=Relu(), bias=1., name=self.name)
self.l0 = FullyConnected(input_shape=input_shape,
size=self.num_classes,
init='alexnet',
activation=Linear(),
bias=0.,
name=self.name)
# self.B = Model(layers=[l1])
def get_weights(self):
# return self.l0.get_weights()
return []
def get_feedback(self):
return self.B
def output_shape(self):
return self.input_shape
def num_params(self):
return 0
def forward(self, X):
return X
###################################################################
def backward(self, AI, AO, DO):
return DO
def gv(self, AI, AO, DO):
return []
def train(self, AI, AO, DO):
return []
###################################################################
def dfa_backward(self, AI, AO, E, DO):
return DO
def dfa_gv(self, AI, AO, E, DO):
return []
def dfa(self, AI, AO, E, DO):
return []
###################################################################
# > https://ml-cheatsheet.readthedocs.io/en/latest/loss_functions.html
# > https://www.ics.uci.edu/~pjsadows/notes.pdf
# > https://deepnotes.io/softmax-crossentropy
def lel_backward(self, AI, AO, E, DO, Y):
'''
S = tf.matmul(AO, tf.transpose(self.B))
# should be doing cross entropy here.
# is this right ?
# just adding softmax ?
ES = tf.subtract(tf.nn.softmax(S), Y)
DO = tf.matmul(ES, self.B)
# (* activation.gradient) and (* AI) occur in the actual layer itself.
return DO
'''
# '''
S = self.l0.forward(AI)
ES = tf.subtract(tf.nn.softmax(S), Y)
DI = self.l0.backward(AI, S, ES)
# '''
# DI = self.B.backwards(AI, Y)
return DI
def lel_gv(self, AI, AO, E, DO, Y):
# '''
S = self.l0.forward(AI)
ES = tf.subtract(tf.nn.softmax(S), Y)
gvs = self.l0.gv(AI, S, ES)
# '''
# gvs = self.B.gvs(AI, Y)
return gvs
def lel(self, AI, AO, E, DO, Y):
assert (False)