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randomly_weighted_feature_networks.py
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randomly_weighted_feature_networks.py
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import tensorflow as tf
import numpy as np
import sys
from scipy import sparse
default_smooth_factor = 0.0000001
default_tnorm = "product"
default_optimizer = "gd"
default_aggregator = "min"
default_positive_fact_penality = 1e-6
default_clauses_aggregator = "min"
def train_op(loss, optimization_algorithm):
if optimization_algorithm == "ftrl":
optimizer = tf.train.FtrlOptimizer(learning_rate=0.01, learning_rate_power=-0.5)
if optimization_algorithm == "gd":
optimizer = tf.train.GradientDescentOptimizer(learning_rate=0.05)
if optimization_algorithm == "ada":
optimizer = tf.train.AdagradOptimizer(learning_rate=0.01)
if optimization_algorithm == "rmsprop":
optimizer = tf.train.RMSPropOptimizer(learning_rate=0.01, decay=0.9)
if optimization_algorithm == "adam":
optimizer = tf.train.AdamOptimizer(learning_rate=0.01)
return optimizer.minimize(loss)
def PR(tensor):
global count
np.set_printoptions(threshold=sys.maxsize)
return tf.Print(tensor, [tf.shape(tensor), tensor.name, tensor], summarize=200000)
def disjunction_of_literals(literals, label="no_label"):
list_of_literal_tensors = [lit.tensor for lit in literals]
literals_tensor = tf.concat(list_of_literal_tensors, 1)
if default_tnorm == "product":
result = 1.0 - tf.reduce_prod(1.0 - literals_tensor, 1, keep_dims=True)
if default_tnorm == "yager2":
result = tf.minimum(1.0, tf.sqrt(tf.reduce_sum(tf.square(literals_tensor), 1, keep_dims=True)))
if default_tnorm == "luk":
result = tf.minimum(1.0, tf.reduce_sum(literals_tensor, 1, keep_dims=True))
if default_tnorm == "goedel":
result = tf.reduce_max(literals_tensor, 1, keep_dims=True, name=label)
if default_aggregator == "product":
return tf.reduce_prod(result, keep_dims=True)
if default_aggregator == "mean":
return tf.reduce_mean(result, keep_dims=True, name=label)
if default_aggregator == "gmean":
return tf.exp(tf.muliply(tf.reduce_sum(tf.log(result), keep_dims=True),
tf.reciprocal(tf.to_float(tf.size(result)))), name=label)
if default_aggregator == "hmean":
return tf.div(tf.to_float(tf.size(result)), tf.reduce_sum(tf.reciprocal(result), keep_dims=True))
if default_aggregator == "min":
return tf.reduce_min(result, keep_dims=True, name=label)
def smooth(parameters):
norm_of_omega = tf.reduce_sum(
tf.expand_dims(tf.concat([tf.expand_dims(tf.reduce_sum(tf.square(par)), 0) for par in parameters], 0), 1))
return tf.multiply(default_smooth_factor, norm_of_omega)
class Domain:
def __init__(self, columns, dom_type="float", label=None):
self.columns = columns
self.label = label
self.tensor = tf.placeholder(dom_type, shape=[None, self.columns], name=self.label)
self.parameters = []
class Domain_concat(Domain):
def __init__(self, domains):
self.columns = np.sum([dom.columns for dom in domains])
self.label = "concatenation of" + ",".join([dom.label for dom in domains])
self.tensor = tf.concat(1, [dom.tensor for dom in domains])
self.parameters = [par for dom in domains for par in dom.parameters]
class Domain_slice(Domain):
def __init__(self, domain, begin_column, end_column):
self.columns = end_column - begin_column
self.label = "projection of" + domain.label + "from column " + begin_column + " to column " + end_column
self.tensor = tf.concat(1, tf.split(1, domain.columns, domain.tensor)[begin_column:end_column])
self.parameters = domain.parameters
class Function(Domain):
def __init__(self, label, domain, range, value=None):
self.label = label
self.domain = domain
self.range = range
self.value = value
if self.value:
self.parameters = []
else:
self.M = tf.Variable(tf.random_normal([self.domain.columns,
self.range.columns]),
name="M_" + self.label)
self.n = tf.Variable(tf.random_normal([1, self.range.columns]),
name="n_" + self.label)
self.parameters = [self.n, self.M]
if self.value:
self.tensor = self.value
else:
self.tensor = tf.add(tf.matmul(self.domain, self.M), self.n)
def generate_V(num_layers, num_features, num_glom_inputs=7):
weight = np.zeros((num_layers, num_features))
for i in range(num_layers):
final_num_input = np.clip(num_glom_inputs, 1, num_features).item()
indices = np.random.choice(num_features, final_num_input, replace=False)
weight[i, indices] = 1.
return weight
def generate_R(num_layers, num_features):
return tf.random_normal([num_layers, num_features])
def generate_Rb(num_layers):
return tf.random_uniform(shape=[1, num_layers], minval=0, maxval=2 * np.pi)
class Predicate:
def __init__(self, label, domain,
layers=None,
sigma=1.,
predefined_V=None,
predefined_R=None,
predefined_Rb=None):
self.label = label
self.domain = domain
self.num_features = self.domain.columns
self.num_layers = layers
self.sigma = sigma
# AL-MB projection weight V
if predefined_V is None:
self.W = tf.Variable(initial_value=generate_V(self.num_layers, self.num_features), dtype=np.float32,
name="rwtn_V" + label, trainable=False)
else:
self.W = tf.Variable(initial_value=predefined_V, dtype=np.float32, name="rwtn_V" + label, trainable=False)
# Random Fourier feature
if predefined_R is None:
self.R = tf.Variable(initial_value=generate_R(self.num_layers, self.num_features),
dtype=np.float32,
name="rwtn_R" + label, trainable=False)
else:
self.R = tf.Variable(initial_value=predefined_R, dtype=np.float32, name="rwtn_R" + label, trainable=False)
if predefined_Rb is None:
self.b = tf.Variable(initial_value=generate_Rb(self.num_layers),
dtype=np.float32,
name="rwtn_R_b" + label, trainable=False)
else:
self.b = tf.Variable(initial_value=predefined_Rb, dtype=np.float32, name="rwtn_R_b" + label, trainable=False)
# Decoder
self.beta = tf.Variable(tf.random_normal([2 * self.num_layers, 1]),
dtype=np.float32,
name="rwtn_u" + label)
self.parameters = [self.W, self.R, self.b, self.beta]
def tensor(self, domain=None):
# Original Code
if domain is None:
domain = self.domain
X = domain.tensor
# Insect brain-inspired feature
# AL-MB transformation
XV = tf.matmul(X, tf.transpose(self.W))
H1 = tf.nn.relu(XV - tf.reduce_mean(XV, axis=1, keepdims=True))
# Random Fourier feature
XR = tf.matmul(X, tf.transpose(self.R))
tr = self.sigma * XR + self.b
H2 = 1 / np.sqrt(self.num_layers) * np.sqrt(2) * tf.math.cos(tr)
# Final feature representation
H = tf.concat([H1, H2], axis=1)
betaH = tf.matmul(tf.tanh(H), self.beta)
result = tf.sigmoid(betaH)
return result
class Literal:
def __init__(self, polarity, predicate, domain=None):
self.predicate = predicate
self.polarity = polarity
if domain is None:
self.domain = predicate.domain
else:
self.domain = domain
if polarity:
self.tensor = predicate.tensor(domain)
else:
if default_tnorm == "product" or default_tnorm == "goedel":
y = tf.equal(predicate.tensor(domain), 0.0)
self.tensor = tf.cast(y, tf.float32)
if default_tnorm == "yager2":
self.tensor = 1 - predicate.tensor(domain)
if default_tnorm == "luk":
self.tensor = 1 - predicate.tensor(domain)
self.parameters = predicate.parameters + domain.parameters
class Clause:
def __init__(self, literals, label=None, weight=1.0):
self.weight = weight
self.label = label
self.literals = literals
self.tensor = disjunction_of_literals(self.literals, label=label)
self.predicates = set([lit.predicate for lit in self.literals])
self.parameters = [par for lit in literals for par in lit.parameters]
class KnowledgeBase:
def __init__(self, label, clauses, save_path=""):
print "defining the knowledge base", label
self.label = label
self.clauses = clauses
self.parameters = [par for cl in self.clauses for par in cl.parameters]
if not self.clauses:
self.tensor = tf.constant(1.0)
else:
clauses_value_tensor = tf.concat([cl.tensor for cl in clauses], 0)
if default_clauses_aggregator == "min":
print "clauses aggregator is min"
self.tensor = tf.reduce_min(clauses_value_tensor)
if default_clauses_aggregator == "mean":
self.tensor = tf.reduce_mean(clauses_value_tensor)
if default_clauses_aggregator == "hmean":
self.tensor = tf.div(tf.to_float(tf.size(clauses_value_tensor)),
tf.reduce_sum(tf.reciprocal(clauses_value_tensor), keep_dims=True))
if default_clauses_aggregator == "wmean":
weights_tensor = tf.constant([cl.weight for cl in clauses])
self.tensor = tf.div(tf.reduce_sum(tf.mul(weights_tensor, clauses_value_tensor)),
tf.reduce_sum(weights_tensor))
if default_positive_fact_penality != 0:
self.loss = smooth(self.parameters) + \
tf.multiply(default_positive_fact_penality, self.penalize_positive_facts()) - \
PR(self.tensor)
else:
self.loss = smooth(self.parameters) - PR(self.tensor)
self.save_path = save_path
self.train_op = train_op(self.loss, default_optimizer)
self.saver = tf.train.Saver()
def penalize_positive_facts(self):
tensor_for_positive_facts = [tf.reduce_sum(Literal(True, lit.predicate, lit.domain).tensor, keep_dims=True) for
cl in self.clauses for lit in cl.literals]
return tf.reduce_sum(tf.concat(tensor_for_positive_facts, 0))
def save(self, sess, version=""):
save_path = self.saver.save(sess, self.save_path + self.label + version + ".ckpt")
def restore(self, sess):
ckpt = tf.train.get_checkpoint_state(self.save_path)
if ckpt and ckpt.model_checkpoint_path:
print("restoring model")
self.saver.restore(sess, ckpt.model_checkpoint_path)
def train(self, sess, feed_dict={}):
return sess.run(self.train_op, feed_dict)
def is_nan(self, sess, feed_dict={}):
return sess.run(tf.is_nan(self.tensor), feed_dict)