def build(P,input_size,output_size,mem_size,mem_width,layer_size):
"""
Create controller function for use during scan op
"""
# Weights for external input
P.W_input_hidden = U.initial_weights(input_size,layer_size)
# Weights for input from read head (read from memory)
P.W_read_hidden = U.initial_weights(mem_width, layer_size)
# Shared bias for external input and read head input
P.b_hidden_0 = 0. * U.initial_weights(layer_size)
# Weights and biases for output of controller
P.W_hidden_output = 0. * U.initial_weights(layer_size,output_size)
P.b_output = 0. * U.initial_weights(output_size)
def controller(input_t,read_t):
"""
Controller consists of single hidden layer between inputs and outputs
"""
hidden_layer = T.tanh(
T.dot(input_t,P.W_input_hidden) +\
T.dot(read_t,P.W_read_hidden) +\
P.b_hidden_0
)
output_t = T.nnet.sigmoid(T.dot(hidden_layer,P.W_hidden_output) + P.b_output)
# Return output and hidden layer of controller used by heads (in model.py)
return output_t,hidden_layer
return controller
def build(P, input_size, output_size, mem_width):
"""
Create controller function for use during scan op
"""
P.W_input_hidden = U.initial_weights(input_size, output_size)
P.b_hidden_0 = 0. * U.initial_weights(output_size)
P.attention_weight = np.array(0.1,dtype=theano.config.floatX)
def controller(input_t, read_t):
# print "input_t",input_t.type
lstm_weight = 1-P.attention_weight
weighted_sum = lstm_weight*input_t + P.attention_weight*read_t
if input_t.ndim > 1 :
output_t = T.nnet.softmax(
T.dot(weighted_sum, P.W_input_hidden) +
P.b_hidden_0
)
else :
output_t = U.vector_softmax(
T.dot(weighted_sum, P.W_input_hidden) +
P.b_hidden_0)
# print "input",read_t.type,input_t.type
# print "weights",P.W_input_hidden.type,P.W_read_hidden.type,P.b_hidden_0.type
# print "layer", hidden_0.type
return output_t
return controller
def build_model(hidden_size, predict_only=False):
X = T.matrix('X')
Y = T.ivector('Y')
#* (0.001 * U.initial_weights(2,hidden_size) + np.array([[0,0,1,1],[1,1,0,0]])))
W_input_hidden = U.create_shared(U.initial_weights(2, hidden_size))
b_hidden = U.create_shared(U.initial_weights(hidden_size))
W_hidden_predict = U.create_shared(U.initial_weights(hidden_size, 2))
b_predict = U.create_shared(U.initial_weights(2))
params = [W_input_hidden, b_hidden, W_hidden_predict, b_predict]
hidden_lin = T.dot(X, W_input_hidden) + b_hidden
hidden = T.nnet.sigmoid(hidden_lin)
predict = T.nnet.softmax(T.dot(hidden, W_hidden_predict) + b_predict)
cost = -T.mean(T.log(
predict[T.arange(Y.shape[0]), Y])) + 1e-3 * adjacency_constraint(
hidden_lin) # + 1e-4 * sum(T.sum(p**2) for p in params)
accuracy = T.mean(T.eq(T.argmax(predict, axis=1), Y))
grad = T.grad(cost, params)
train = theano.function(
inputs=[X, Y],
#updates = updates.momentum(params,grad,0.9999,0.1) if not predict_only else None,
#updates = updates.momentum(params,grad,0.999,0.0005),
updates=updates.adadelta(params, grad),
outputs=[accuracy, W_input_hidden, b_hidden, (hidden > 0.5)])
predict = theano.function(inputs=[X], outputs=predict[:, 0])
i = T.iscalar('i')
hidden_p = theano.function(inputs=[X, i], outputs=hidden[:, i])
return train, predict, hidden_p, params
def __init__(self, inputs, input_size, output_size, is_backward=False, parameters=None):
if parameters is None:
W_if = U.create_shared(U.initial_weights(input_size, output_size), name='W_if')
W_ff = U.create_shared(U.initial_weights(output_size, output_size), name='W_ff')
b = U.create_shared(U.initial_weights(output_size), name='b')
else:
W_if = theano.shared(parameters['W_if'], name='W_if')
W_ff = theano.shared(parameters['W_ff'], name='W_ff')
b = theano.shared(parameters['b'], name='b')
initial = U.create_shared(U.initial_weights(output_size))
self.is_backward = is_backward
self.activation_fn = lambda x: T.minimum(x * (x > 0), 20)
def step(in_t, out_tminus1):
return self.activation_fn(T.dot(out_tminus1, W_ff) + T.dot(in_t, W_if) + b)
self.output, _ = theano.scan(
step,
sequences=[inputs],
outputs_info=[initial],
go_backwards=self.is_backward
)
self.params = [W_if, W_ff, b]
def __init__(self, inputs, input_size, output_size, is_backward=False, parameters=None):
if parameters is None:
self.W_if = U.create_shared(U.initial_weights(input_size, output_size), name='W_if')
self.W_ff = U.create_shared(U.initial_weights(output_size, output_size), name='W_ff')
self.b = U.create_shared(U.initial_weights(output_size), name='b')
else:
self.W_if = theano.shared(parameters['W_if'], name='W_if')
self.W_ff = theano.shared(parameters['W_ff'], name='W_ff')
self.b = theano.shared(parameters['b'], name='b')
initial = T.zeros((output_size,))
self.is_backward = is_backward
self.activation_fn = lambda x: T.cast(T.minimum(x * (x > 0), 20), dtype='float32')#dtype=theano.config.floatX)
nonrecurrent = T.dot(inputs, self.W_if) + self.b
self.output, _ = theano.scan(
lambda in_t, out_tminus1, weights: self.activation_fn(in_t + T.dot(out_tminus1, weights)),
sequences=[nonrecurrent],
outputs_info=[initial],
non_sequences=[self.W_ff],
go_backwards=self.is_backward
)
self.params = [self.W_if, self.W_ff, self.b]
def build(P, id, input_size, mem_width):
# P["W_%d_key" % id] = U.initial_weights(input_size, mem_width)
P["W_%d_key" % id] = U.initial_weights(input_size, mem_width)
P["b_%d_key" % id] = 0. * U.initial_weights(mem_width)
P["W_%d_sim" % id] = U.initial_weights(input_size, mem_width)
P["b_%d_sim" % id] = 0. * U.initial_weights(mem_width)
# P["W_%d_shift" % id] = U.initial_weights(input_size, shift_width)
# P["b_%d_shift" % id] = 0. * U.initial_weights(shift_width)
if id != 0 :
P["W_%d_g" % id] = U.initial_weights(input_size)
P["b_%d_g" % id] = 0.
def head_params(x):
# key
key_t = T.dot(x, P["W_%d_key" % id]) + P["b_%d_key" % id]
#similarity weight
sim_t = T.nnet.sigmoid(T.dot(x, P["W_%d_sim" % id]) + P["b_%d_sim" % id])
#attention weight
att_t = 1 - sim_t
if id != 0 :
g_t = T.nnet.sigmoid(T.dot(x, P["W_%d_g" % id]) + P["b_%d_g" % id])#guess this is a vector
else :
g_t = T.ones([x.shape[0]])
return key_t, g_t, sim_t, att_t
return head_params
def build(P, input_size, output_size, mem_width):
"""
Create controller function for use during scan op
"""
P.W_input_hidden = U.initial_weights(input_size, output_size)
P.b_hidden_0 = 0. * U.initial_weights(output_size)
P.W_read_hidden = U.initial_weights(mem_width, input_size)
P.b_hidden_read = 0. * U.initial_weights(input_size)
def controller(input_t, read_t):
# print "input_t",input_t.type
new_input_t = (input_t + T.nnet.sigmoid(T.dot(read_t,P.W_read_hidden) + P.b_hidden_read))/2
if input_t.ndim > 1 :
output_t = T.nnet.softmax(
T.dot(new_input_t, P.W_input_hidden) +
P.b_hidden_0
)
else :
output_t = U.vector_softmax(
T.dot(new_input_t, P.W_input_hidden) +
P.b_hidden_0)
# print "input",read_t.type,input_t.type
# print "weights",P.W_input_hidden.type,P.W_read_hidden.type,P.b_hidden_0.type
# print "layer", hidden_0.type
return output_t
return controller
def __init__(self, inputs, input_size, output_size, parameters=None):
if parameters is None:
self.W = U.create_shared(U.initial_weights(input_size, output_size), name='W')
self.b = U.create_shared(U.initial_weights(output_size), name='b')
else:
self.W = theano.shared(parameters['W'], name='W')
self.b = theano.shared(parameters['b'], name='b')
self.output = T.nnet.softmax(T.dot(inputs, self.W) + self.b)
self.params = [self.W, self.b]
def __init__(self, inputs, input_size, output_size, parameters=None):
if parameters is None:
W = U.create_shared(U.initial_weights(input_size, output_size), name='W')
b = U.create_shared(U.initial_weights(output_size), name='b')
else:
W = theano.shared(parameters['W'], name='W')
b = theano.shared(parameters['b'], name='b')
self.output = T.nnet.softmax(T.dot(inputs, W) + b)
self.params = [W, b]
def __init__(self, forward_in, backward_in, input_size, output_size):
Wf = U.create_shared(U.initial_weights(input_size, output_size))
Wb = U.create_shared(U.initial_weights(input_size, output_size))
b = U.create_shared(U.initial_weights(output_size))
self.activations = T.dot(forward_in, Wf) + T.dot(backward_in, Wb) + b
self.output, _ = theano.scan(lambda inpt: T.nnet.softmax(inpt),
sequences=[self.activations])
self.params = [Wf, Wb, b]
def build(P, n_input, n_hidden, n_output):
P.W_i_h = U.initial_weights(n_input, n_hidden)
P.W_h_o = U.initial_weights(n_hidden, n_output)
P.b_h = U.initial_weights(n_hidden)
P.b_o = U.initial_weights(n_output)
def f(X):
hidden = T.nnet.sigmoid(T.dot(X, P.W_i_h) + P.b_h)
output = T.nnet.softmax(T.dot(hidden, P.W_h_o) + P.b_o)
return output
return f
def __init__(self, forward_in, backward_in, input_size, output_size):
Wf = U.create_shared(U.initial_weights(input_size, output_size))
Wb = U.create_shared(U.initial_weights(input_size, output_size))
b = U.create_shared(U.initial_weights(output_size))
self.activations = T.dot(forward_in, Wf) + T.dot(backward_in, Wb) + b
self.output, _ = theano.scan(
lambda inpt: T.nnet.softmax(inpt),
sequences=[self.activations]
)
self.params = [Wf, Wb, b]
def __init__(self, inputs, input_size, output_size, parameters=None):
self.activation_fn = lambda x: T.minimum(x * (x > 0), 20)
if parameters is None:
self.W = U.create_shared(U.initial_weights(input_size, output_size), name='W')
self.b = U.create_shared(U.initial_weights(output_size), name='b')
else:
self.W = theano.shared(parameters['W'], name='W')
self.b = theano.shared(parameters['b'], name='b')
self.output = self.activation_fn(T.dot(inputs, self.W) + self.b)
self.params = [self.W, self.b]
def __init__(self, inputs, input_size, output_size):
self.activation_fn = lambda x: T.minimum(x * (x > 0), 20)
W = U.create_shared(U.initial_weights(input_size, output_size))
b = U.create_shared(U.initial_weights(output_size))
self.output2 = self.activation_fn(T.dot(inputs, W) + b)
self.output, _ = theano.scan(
lambda element: self.activation_fn(T.dot(element, W) + b),
sequences=[inputs])
self.params = [W, b]
def __init__(self, inputs, input_size, output_size, rng, dropout_rate, parameters=None):
self.activation_fn = lambda x: T.minimum(x * (x > 0), 20)
if parameters is None:
self.W = U.create_shared(U.initial_weights(input_size, output_size), name='W')
self.b = U.create_shared(U.initial_weights(output_size), name='b')
else:
self.W = theano.shared(parameters['W'], name='W')
self.b = theano.shared(parameters['b'], name='b')
self.output = T.cast(self.activation_fn( (T.dot(inputs, self.W) + self.b)*(1.0-dropout_rate) ), dtype=theano.config.floatX)
self.params = [self.W, self.b]
def __init__(self, inputs, input_size, output_size):
self.activation_fn = lambda x: T.minimum(x * (x > 0), 20)
W = U.create_shared(U.initial_weights(input_size, output_size))
b = U.create_shared(U.initial_weights(output_size))
self.output2 = self.activation_fn(T.dot(inputs, W) + b)
self.output, _ = theano.scan(
lambda element: self.activation_fn(T.dot(element, W) + b),
sequences=[inputs]
)
self.params = [W, b]
def __init__(self, inputs, input_size, output_size, parameters=None):
self.activation_fn = lambda x: T.minimum(x * (x > 0), 20)
if parameters is None:
self.W = U.create_shared(U.initial_weights(input_size,
output_size),
name='W')
self.b = U.create_shared(U.initial_weights(output_size), name='b')
else:
self.W = theano.shared(parameters['W'], name='W')
self.b = theano.shared(parameters['b'], name='b')
self.output = self.activation_fn(T.dot(inputs, self.W) + self.b)
self.params = [self.W, self.b]
def build_network(input_size, hidden_size, constraint_adj=False):
P = Parameters()
X = T.bmatrix('X')
P.W_input_hidden = U.initial_weights(input_size, hidden_size)
P.b_hidden = U.initial_weights(hidden_size)
P.b_output = U.initial_weights(input_size)
hidden_lin = T.dot(X, P.W_input_hidden) + P.b_hidden
hidden = T.nnet.sigmoid(hidden_lin)
output = T.nnet.softmax(T.dot(hidden, P.W_input_hidden.T) + P.b_output)
parameters = P.values()
cost = build_error(X, output, P)
if constraint_adj: pass
#cost = cost + adjacency_constraint(hidden_lin)
return X, output, cost, P
def build_network(input_size,hidden_size,constraint_adj=False):
P = Parameters()
X = T.bmatrix('X')
P.W_input_hidden = U.initial_weights(input_size,hidden_size)
P.b_hidden = U.initial_weights(hidden_size)
P.b_output = U.initial_weights(input_size)
hidden_lin = T.dot(X,P.W_input_hidden)+P.b_hidden
hidden = T.nnet.sigmoid(hidden_lin)
output = T.nnet.softmax(T.dot(hidden,P.W_input_hidden.T) + P.b_output)
parameters = P.values()
cost = build_error(X,output,P)
if constraint_adj:pass
#cost = cost + adjacency_constraint(hidden_lin)
return X,output,cost,P
def __init__(self, inputs, input_size, output_size, parameters=None):
self.activation_fn = lambda x: T.minimum(x * (x > 0), 20)
if parameters is None:
W = U.create_shared(U.initial_weights(input_size, output_size), name='W')
b = U.create_shared(U.initial_weights(output_size), name='b')
else:
W = theano.shared(parameters['W'], name='W')
b = theano.shared(parameters['b'], name='b')
self.output, _ = theano.scan(
lambda element: self.activation_fn(T.dot(element, W) + b),
sequences=[inputs]
)
self.params = [W, b]
def build(P, input_size, output_size, mem_size, mem_width, layer_sizes):
"""
Create controller function for use during scan op
"""
P.W_input_hidden = U.initial_weights(input_size, layer_sizes[0])
P.W_read_hidden = U.initial_weights(mem_width, layer_sizes[0])
P.b_hidden_0 = 0.0 * U.initial_weights(layer_sizes[0])
hidden_weights = []
for i in xrange(len(layer_sizes) - 1):
P["W_hidden_%d" % (i + 1)] = U.initial_weights(layer_sizes[i], layer_sizes[i + 1])
P["b_hidden_%d" % (i + 1)] = 0.0 * U.initial_weights(layer_sizes[i + 1])
hidden_weights.append((P["W_hidden_%d" % (i + 1)], P["b_hidden_%d" % (i + 1)]))
P.W_hidden_output = 0.0 * U.initial_weights(layer_sizes[-1], output_size)
P.b_output = 0.0 * U.initial_weights(output_size)
def controller(input_t, read_t):
# print "input_t",input_t.type
prev_layer = hidden_0 = T.dot(input_t, P.W_input_hidden) + T.dot(read_t, P.W_read_hidden) + P.b_hidden_0
# print "input",read_t.type,input_t.type
# print "weights",P.W_input_hidden.type,P.W_read_hidden.type,P.b_hidden_0.type
# print "layer", hidden_0.type
for W, b in hidden_weights:
prev_layer = T.tanh(T.dot(prev_layer, W) + b)
fin_hidden = prev_layer
output_t = T.nnet.sigmoid(T.dot(fin_hidden, P.W_hidden_output) + P.b_output)
return output_t, fin_hidden
return controller
def _build_conv_pool(P, n_layer, input_layer, n_feats_out, n_feats_in, conv_size, pool_size):
P["W_%d"%n_layer] = U.initial_weights(n_feats_out, n_feats_in, conv_size, conv_size)
P["b_%d"%n_layer] = np.zeros((n_feats_out, ))
W = P["W_%d"%n_layer]
b = P["b_%d"%n_layer]
out_conv = T.nnet.conv2d(input_layer, W)
out_pool = max_pool_2d(out_conv, (pool_size, pool_size))
output = T.nnet.sigmoid(out_pool + b.dimshuffle('x', 0, 'x', 'x'))
return output
def build(P, input_size, proj_size) :
P["image_projection matrix"] = U.initial_weights(input_size, proj_size) #issue: initial method
def image_project(x) :
#projection
proj_result = T.dot(x,P["image_projection matrix"])
return proj_result #whether normalize or not
return image_project
def __init__(self, inputs, input_size, output_size, is_backward=False):
W_if = U.create_shared(U.initial_weights(input_size, output_size))
W_ff = U.create_shared(U.initial_weights(output_size, output_size))
b = U.create_shared(U.initial_weights(output_size))
initial = U.create_shared(U.initial_weights(output_size))
self.activation_fn = lambda x: T.minimum(x * (x > 0), 20)
self.output, _ = theano.scan(
lambda in_t: theano.scan(
lambda index, out_tminus1: self.activation_fn(T.dot(out_tminus1, W_ff) + T.dot(in_t[index], W_if) + b),
sequences=[T.arange(inputs.shape[1])],
outputs_info=[initial],
go_backwards=is_backward
),
sequences=[inputs] # for each sample at time "t"
)
self.params = [W_if, W_ff, b]
def __init__(self, inputs, input_size, output_size, is_backward=False):
W_if = U.create_shared(U.initial_weights(input_size, output_size))
W_ff = U.create_shared(U.initial_weights(output_size, output_size))
b = U.create_shared(U.initial_weights(output_size))
initial = U.create_shared(U.initial_weights(output_size))
self.activation_fn = lambda x: T.minimum(x * (x > 0), 20)
self.output, _ = theano.scan(
lambda in_t: theano.scan(
lambda index, out_tminus1: self.activation_fn(
T.dot(out_tminus1, W_ff) + T.dot(in_t[index], W_if) + b),
sequences=[T.arange(inputs.shape[1])],
outputs_info=[initial],
go_backwards=is_backward),
sequences=[inputs] # for each sample at time "t"
)
self.params = [W_if, W_ff, b]
def build_network(input_size, hidden_size):
X = T.dmatrix('X')
W_input_to_hidden = U.create_shared(
U.initial_weights(input_size, hidden_size))
W_hidden_to_hidden = U.create_shared(
U.initial_weights(hidden_size, hidden_size))
initial_hidden = U.create_shared(U.initial_weights(hidden_size),
name='init_hidden')
b_hidden = U.create_shared(U.initial_weights(hidden_size))
b_hidden_reproduction = U.create_shared(U.initial_weights(hidden_size))
b_input_reproduction = U.create_shared(U.initial_weights(input_size))
parameters = [
W_input_to_hidden,
W_hidden_to_hidden,
b_hidden,
initial_hidden,
b_hidden_reproduction,
b_input_reproduction,
]
hidden, hidden1_reproduction, input_reproduction = make_rae(
X, W_input_to_hidden, W_hidden_to_hidden, b_hidden, initial_hidden,
b_hidden_reproduction, b_input_reproduction)
unrolled = unroll(hidden[-1], W_input_to_hidden, W_hidden_to_hidden,
b_hidden_reproduction, b_input_reproduction,
hidden.shape[0])
return X, parameters, hidden, hidden1_reproduction, input_reproduction, unrolled
def __init__(self,
inputs,
input_size,
output_size,
rng,
dropout_rate,
parameters=None):
self.activation_fn = lambda x: T.minimum(x * (x > 0), 20)
if parameters is None:
self.W = U.create_shared(U.initial_weights(input_size,
output_size),
name='W')
self.b = U.create_shared(U.initial_weights(output_size), name='b')
else:
self.W = theano.shared(parameters['W'], name='W')
self.b = theano.shared(parameters['b'], name='b')
self.output = T.cast(self.activation_fn(
(T.dot(inputs, self.W) + self.b) * (1.0 - dropout_rate)),
dtype=theano.config.floatX)
self.params = [self.W, self.b]
def build(P):
image_row = 35 # num of base pairs
image_col = 4 # num of nucleotides
n_input = image_row * image_col
n_feats = [1, 16] # num of "motifs" We'll learn 16 PWM's
conv_row = 8 # 8-long PWM
conv_col = 4 # 4 nucleotides
pool_row = 28 # ??
pool_col = 1
n_pool_out = (n_feats[1]
* ((image_row - conv_row + 1) / pool_row)
* ((image_col - conv_col + 1) / pool_col))
n_hidden = 32
n_output = 1
P.W_input_conv = U.initial_weights(n_feats[1], n_feats[0], conv_row, conv_col)
P.b_pool_out = np.zeros(n_pool_out)
P.W_pool_out_hidden = U.initial_weights(n_pool_out, n_hidden)
P.b_hidden = np.zeros(n_hidden)
P.W_hidden_output = U.initial_weights(n_hidden, n_output)
P.b_output = np.zeros(n_output)
def f(X):
n_samples = X.shape[0]
input = X.reshape((n_samples, n_feats[0], image_row, image_col))
conv_out = T.nnet.conv2d(input, P.W_input_conv)
pool_out_= max_pool_2d(conv_out, (pool_row, pool_col))
pool_out = pool_out_.flatten(2) + P.b_pool_out
hidden = relu(T.dot(pool_out, P.W_pool_out_hidden) + P.b_hidden)
output = T.dot(hidden, P.W_hidden_output) + P.b_output
return output.astype(theano.config.floatX)
return f
def __init__(self,
inputs,
input_size,
output_size,
is_backward=False,
parameters=None):
if parameters is None:
self.W_if = U.create_shared(U.initial_weights(
input_size, output_size),
name='W_if')
self.W_ff = U.create_shared(U.initial_weights(
output_size, output_size),
name='W_ff')
self.b = U.create_shared(U.initial_weights(output_size), name='b')
else:
self.W_if = theano.shared(parameters['W_if'], name='W_if')
self.W_ff = theano.shared(parameters['W_ff'], name='W_ff')
self.b = theano.shared(parameters['b'], name='b')
initial = T.zeros((output_size, ))
self.is_backward = is_backward
self.activation_fn = lambda x: T.cast(T.minimum(x * (x > 0), 20),
dtype='float32'
) #dtype=theano.config.floatX)
nonrecurrent = T.dot(inputs, self.W_if) + self.b
self.output, _ = theano.scan(
lambda in_t, out_tminus1, weights: self.activation_fn(in_t + T.dot(
out_tminus1, weights)),
sequences=[nonrecurrent],
outputs_info=[initial],
non_sequences=[self.W_ff],
go_backwards=self.is_backward)
self.params = [self.W_if, self.W_ff, self.b]
def build_model(hidden_size,predict_only=False):
X = T.matrix('X')
Y = T.ivector('Y')
#* (0.001 * U.initial_weights(2,hidden_size) + np.array([[0,0,1,1],[1,1,0,0]])))
W_input_hidden = U.create_shared(U.initial_weights(2,hidden_size))
b_hidden = U.create_shared(U.initial_weights(hidden_size))
W_hidden_predict = U.create_shared(U.initial_weights(hidden_size,2))
b_predict = U.create_shared(U.initial_weights(2))
params = [W_input_hidden,b_hidden,W_hidden_predict,b_predict]
hidden_lin = T.dot(X,W_input_hidden) + b_hidden
hidden = T.nnet.sigmoid(hidden_lin)
predict = T.nnet.softmax(T.dot(hidden,W_hidden_predict) + b_predict)
cost = -T.mean(T.log(predict[T.arange(Y.shape[0]),Y])) + 1e-3*adjacency_constraint(hidden_lin)# + 1e-4 * sum(T.sum(p**2) for p in params)
accuracy = T.mean(T.eq(T.argmax(predict,axis=1),Y))
grad = T.grad(cost,params)
train = theano.function(
inputs = [X,Y],
#updates = updates.momentum(params,grad,0.9999,0.1) if not predict_only else None,
#updates = updates.momentum(params,grad,0.999,0.0005),
updates = updates.adadelta(params,grad),
outputs = [accuracy,W_input_hidden,b_hidden,(hidden>0.5)]
)
predict = theano.function(
inputs = [X],
outputs = predict[:,0]
)
i = T.iscalar('i')
hidden_p = theano.function(
inputs = [X,i],
outputs = hidden[:,i]
)
return train,predict,hidden_p,params
def build(P, n_input, n_hidden, n_output):
P.W_hidden_output = U.initial_weights(n_hidden, n_output)
P.b_output = np.zeros(n_output)
# n_hidden = 50 * 4 * 4 = 800 (n_feats of layer2 * pixels in image)
# TODO: fix these magic numbers (especially the 800)
def f(X):
layer0 = X.reshape((X.shape[0], 1, 28, 28))
layer1 = _build_conv_pool(P, 1, layer0, 20, 1, 5, 2)
layer2_= _build_conv_pool(P, 2, layer1, 50, 20, 5, 2)
layer2 = layer2_.flatten(2)
output = T.nnet.softmax(T.dot(layer2, P.W_hidden_output) + P.b_output)
return output
return f
def build_model(P,X,input_size,hidden_size,output_size): W_input_hidden = U.create_shared(U.initial_weights(input_size,hidden_size)) W_hidden_hidden = U.create_shared(U.initial_weights(hidden_size,hidden_size)) W_hidden_output = U.create_shared(U.initial_weights(hidden_size,output_size)) b_hidden = U.create_shared(U.initial_weights(hidden_size)) i_hidden = U.create_shared(U.initial_weights(hidden_size)) b_output = U.create_shared(U.initial_weights(output_size)) hidden = build_rnn(T.dot(X,W_input_hidden),W_hidden_hidden,b_hidden,i_hidden) predict = T.nnet.softmax(T.dot(hidden,W_hidden_output) + b_output) return X,predict
def build(P,
input_size=8,
output_size=8,
mem_size=128,
mem_width=20,
layer_sizes=[100]):
"""
Create controller function for use during scan op
"""
P.W_input_hidden = U.initial_weights(input_size, layer_sizes[0])
P.W_read_hidden = U.initial_weights(mem_width, layer_sizes[0])
P.b_hidden_0 = 0. * U.initial_weights(layer_sizes[0])
hidden_weights = []
for i in xrange(len(layer_sizes) - 1):
P["W_hidden_%d" % (i + 1)] = U.initial_weights(layer_sizes[i],
layer_sizes[i + 1])
P["b_hidden_%d" % (i + 1)] = 0. * U.initial_weights(layer_sizes[i + 1])
hidden_weights.append(
(P["W_hidden_%d" % (i + 1)], P["b_hidden_%d" % (i + 1)]))
P.W_hidden_output = 0. * U.initial_weights(layer_sizes[-1], output_size)
P.b_output = 0. * U.initial_weights(output_size)
def controller(input_t, read_t):
# print "input_t",input_t.type
prev_layer = hidden_0 = T.tanh(
T.dot(input_t, P.W_input_hidden) + T.dot(read_t, P.W_read_hidden) +
P.b_hidden_0)
# print "input",read_t.type,input_t.type
# print "weights",P.W_input_hidden.type,P.W_read_hidden.type,P.b_hidden_0.type
# print "layer", hidden_0.type
for W, b in hidden_weights:
prev_layer = T.tanh(T.dot(prev_layer, W) + b)
fin_hidden = prev_layer
output_t = T.nnet.sigmoid(
T.dot(fin_hidden, P.W_hidden_output) + P.b_output)
return output_t, fin_hidden
return controller
def build_model(P, X, input_size, hidden_size, output_size):
W_input_hidden = U.create_shared(U.initial_weights(input_size,
hidden_size))
W_hidden_hidden = U.create_shared(
U.initial_weights(hidden_size, hidden_size))
W_hidden_output = U.create_shared(
U.initial_weights(hidden_size, output_size))
b_hidden = U.create_shared(U.initial_weights(hidden_size))
i_hidden = U.create_shared(U.initial_weights(hidden_size))
b_output = U.create_shared(U.initial_weights(output_size))
hidden = build_rnn(T.dot(X, W_input_hidden), W_hidden_hidden, b_hidden,
i_hidden)
predict = T.nnet.softmax(T.dot(hidden, W_hidden_output) + b_output)
return X, predict
def build_network(input_size,hidden_size):
X = T.dmatrix('X')
W_input_to_hidden = U.create_shared(U.initial_weights(input_size,hidden_size))
W_hidden_to_hidden = U.create_shared(U.initial_weights(hidden_size,hidden_size))
initial_hidden = U.create_shared(U.initial_weights(hidden_size))
b_hidden = U.create_shared(U.initial_weights(hidden_size))
b_hidden_reproduction = U.create_shared(U.initial_weights(hidden_size))
b_input_reproduction = U.create_shared(U.initial_weights(input_size))
parameters = [
W_input_to_hidden,
W_hidden_to_hidden,
b_hidden,
initial_hidden,
b_hidden_reproduction,
b_input_reproduction,
]
hidden, hidden1_reproduction, input_reproduction = make_rae(
X,
W_input_to_hidden,
W_hidden_to_hidden,
b_hidden,
initial_hidden,
b_hidden_reproduction,
b_input_reproduction
)
unrolled = unroll(
hidden[-1],
W_input_to_hidden,
W_hidden_to_hidden,
b_hidden_reproduction,
b_input_reproduction,
hidden.shape[0]
)
return X,parameters,hidden,hidden1_reproduction,input_reproduction,unrolled
def build(P, input_size, mem_width, mem_size, shift_width):
"""
NTM heads are implemented as another hidden layer coming after
the last hidden layer of the controller that emits
k_t, beta_t, g_t, s_t, gamma_t as outputs (see Controller outputs
of Figure 2 in paper) along with erase and add vectors
"""
P["W_key"] = U.initial_weights(input_size, mem_width)
P["b_key"] = 0. * U.initial_weights(mem_width)
P["W_beta"] = 0. * U.initial_weights(input_size)
P["b_beta"] = 0.
P["W_g"] = U.initial_weights(input_size)
P["b_g"] = 0.
P["W_shift"] = U.initial_weights(input_size, shift_width)
P["b_shift"] = 0. * U.initial_weights(shift_width)
P["W_gamma"] = U.initial_weights(input_size)
P["b_gamma"] = 0.
P["W_erase"] = U.initial_weights(input_size, mem_width)
P["b_erase"] = 0. * U.initial_weights(mem_width)
P["W_add"] = U.initial_weights(input_size, mem_width)
P["b_add"] = 0. * U.initial_weights(mem_width)
def head_params(x):
"""
Takes hidden layer from controller computes
k_t, beta_t, g_t, s_t, and erase and add
vectors as outputs
"""
# key
key_t = T.dot(x, P["W_key"]) + P["b_key"]
# key strength
_beta_t = T.dot(x, P["W_beta"]) + P["b_beta"]
beta_t = T.nnet.softplus(_beta_t)
# interpolation gate
g_t = T.nnet.sigmoid(T.dot(x, P["W_g"]) + P["b_g"])
# shift
shift_t = U.vector_softmax(T.dot(x, P["W_shift"]) + P["b_shift"])
shift_t.name = "shift_t"
# sharpening
_gamma_t = T.dot(x, P["W_gamma"]) + P["b_gamma"]
gamma_t = T.nnet.softplus(_gamma_t) + 1.
# erase and add vectors
erase_t = T.nnet.sigmoid(T.dot(x, P["W_erase"]) + P["b_erase"])
add_t = T.dot(x, P["W_add"]) + P["b_add"]
return key_t, beta_t, g_t, shift_t, gamma_t, erase_t, add_t
return head_params
def build(P, id, input_size, mem_width, mem_size, shift_width):
# 1. content addressing
P["W_%d_key" % id] = U.initial_weights(input_size, mem_width)
P["b_%d_key" % id] = 0. * U.initial_weights(mem_width)
P["W_%d_beta" % id] = 0. * U.initial_weights(input_size)
P["b_%d_beta" % id] = 0.
# 2. interpolation
P["W_%d_g" % id] = U.initial_weights(input_size)
P["b_%d_g" % id] = 0.
# 3. convolutional shift
P["W_%d_shift" % id] = U.initial_weights(input_size, shift_width)
P["b_%d_shift" % id] = 0. * U.initial_weights(shift_width)
# 4. sharpening
P["W_%d_gamma" % id] = U.initial_weights(input_size)
P["b_%d_gamma" % id] = 0.
# 5. erase and add vector
P["W_%d_erase" % id] = U.initial_weights(input_size, mem_width)
P["b_%d_erase" % id] = 0. * U.initial_weights(mem_width)
P["W_%d_add" % id] = U.initial_weights(input_size, mem_width)
P["b_%d_add" % id] = 0. * U.initial_weights(mem_width)
def head_params(x):
# key
key_t = T.dot(x, P["W_%d_key" % id]) + P["b_%d_key" % id]
# shift
shift_t = U.vector_softmax(
T.dot(x, P["W_%d_shift" % id]) + P["b_%d_shift" % id])
shift_t.name = "shift_t"
# scalars
_beta_t = T.dot(x, P["W_%d_beta" % id]) + P["b_%d_beta" % id]
_gamma_t = T.dot(x, P["W_%d_gamma" % id]) + P["b_%d_gamma" % id]
beta_t = T.nnet.softplus(_beta_t)
gamma_t = T.nnet.softplus(_gamma_t) + 1.
# beta_t = (_beta_t > 0)*_beta_t
# gamma_t = (_gamma_t > 0)*_gamma_t + 1.
# beta_t = T.exp(_beta_t)
# gamma_t = T.exp(_gamma_t) + 1.
g_t = T.nnet.sigmoid(T.dot(x, P["W_%d_g" % id]) + P["b_%d_g" % id])
erase_t = T.nnet.sigmoid(
T.dot(x, P["W_%d_erase" % id]) + P["b_%d_erase" % id])
add_t = T.dot(x, P["W_%d_add" % id]) + P["b_%d_add" % id]
return key_t, beta_t, g_t, shift_t, gamma_t, erase_t, add_t
return head_params
def build(P,id,input_size,mem_width,mem_size,shift_width):
P["W_%d_key"%id] = U.initial_weights(input_size,mem_width)
P["b_%d_key"%id] = 0. * U.initial_weights(mem_width)
# P["W_%d_shift"%id] = U.initial_weights(input_size) # 100
# P["b_%d_shift"%id] = 0.
P["W_%d_shift"%id] = U.initial_weights(input_size,shift_width) # 100X3
P["b_%d_shift"%id] = 0. * U.initial_weights(shift_width)
# P["W_%d_beta"%id] = 0. * U.initial_weights(input_size)
P["W_%d_beta"%id] = U.initial_weights(input_size)
P["b_%d_beta"%id] = 0.
P["W_%d_gamma"%id] = U.initial_weights(input_size)
P["b_%d_gamma"%id] = 0.
P["W_%d_g"%id] = U.initial_weights(input_size)
P["b_%d_g"%id] = 0.
P["W_%d_erase"%id] = U.initial_weights(input_size,mem_width)
P["b_%d_erase"%id] = 0. * U.initial_weights(mem_width)
P["W_%d_add"%id] = U.initial_weights(input_size,mem_width)
P["b_%d_add"%id] = 0. * U.initial_weights(mem_width)
def head_params(x):
# key
key_t = T.dot(x,P["W_%d_key"%id]) + P["b_%d_key"%id]
# shift
shift_t = T.nnet.sigmoid(T.dot(x,P["W_%d_shift"%id]) + P["b_%d_shift"%id]) # *2 - 1
# shift_t = U.vector_softmax(T.dot(x,P["W_%d_shift"%id]) + P["b_%d_shift"%id])
# shift_t.name = "shift_t"
# scalars
_beta_t = T.dot(x,P["W_%d_beta"%id]) + P["b_%d_beta"%id]
_gamma_t = T.dot(x,P["W_%d_gamma"%id]) + P["b_%d_gamma"%id]
beta_t = T.nnet.softplus(_beta_t)
gamma_t = T.nnet.softplus(_gamma_t) + 1.
# beta_t = (_beta_t > 0)*_beta_t
# gamma_t = (_gamma_t > 0)*_gamma_t + 1.
# beta_t = T.exp(_beta_t)
# gamma_t = T.exp(_gamma_t) + 1.
g_t = T.nnet.sigmoid(T.dot(x,P["W_%d_g"%id]) + P["b_%d_g"%id])
erase_t = T.nnet.sigmoid(T.dot(x,P["W_%d_erase"%id]) + P["b_%d_erase"%id])
add_t = T.dot(x,P["W_%d_add"%id]) + P["b_%d_add"%id]
return key_t,beta_t,g_t,shift_t,gamma_t,erase_t,add_t
return head_params
def build(P, id, input_size, mem_width, mem_size, shift_width):
P["W_%d_key" % id] = U.initial_weights(input_size, mem_width)
P["b_%d_key" % id] = 0. * U.initial_weights(mem_width)
# P["W_%d_shift"%id] = U.initial_weights(input_size) # 100
# P["b_%d_shift"%id] = 0.
P["W_%d_shift" % id] = U.initial_weights(input_size, shift_width) # 100X3
P["b_%d_shift" % id] = 0. * U.initial_weights(shift_width)
# P["W_%d_beta"%id] = 0. * U.initial_weights(input_size)
P["W_%d_beta" % id] = U.initial_weights(input_size)
P["b_%d_beta" % id] = 0.
P["W_%d_gamma" % id] = U.initial_weights(input_size)
P["b_%d_gamma" % id] = 0.
P["W_%d_g" % id] = U.initial_weights(input_size)
P["b_%d_g" % id] = 0.
P["W_%d_erase" % id] = U.initial_weights(input_size, mem_width)
P["b_%d_erase" % id] = 0. * U.initial_weights(mem_width)
P["W_%d_add" % id] = U.initial_weights(input_size, mem_width)
P["b_%d_add" % id] = 0. * U.initial_weights(mem_width)
def head_params(x):
# key
key_t = T.dot(x, P["W_%d_key" % id]) + P["b_%d_key" % id]
# shift
shift_t = T.nnet.sigmoid(
T.dot(x, P["W_%d_shift" % id]) + P["b_%d_shift" % id]) # *2 - 1
# shift_t = U.vector_softmax(T.dot(x,P["W_%d_shift"%id]) + P["b_%d_shift"%id])
# shift_t.name = "shift_t"
# scalars
_beta_t = T.dot(x, P["W_%d_beta" % id]) + P["b_%d_beta" % id]
_gamma_t = T.dot(x, P["W_%d_gamma" % id]) + P["b_%d_gamma" % id]
beta_t = T.nnet.softplus(_beta_t)
gamma_t = T.nnet.softplus(_gamma_t) + 1.
# beta_t = (_beta_t > 0)*_beta_t
# gamma_t = (_gamma_t > 0)*_gamma_t + 1.
# beta_t = T.exp(_beta_t)
# gamma_t = T.exp(_gamma_t) + 1.
g_t = T.nnet.sigmoid(T.dot(x, P["W_%d_g" % id]) + P["b_%d_g" % id])
erase_t = T.nnet.sigmoid(
T.dot(x, P["W_%d_erase" % id]) + P["b_%d_erase" % id])
add_t = T.dot(x, P["W_%d_add" % id]) + P["b_%d_add" % id]
return key_t, beta_t, g_t, shift_t, gamma_t, erase_t, add_t
return head_params
def build_lstm_step(P,word_vector_size,hidden_state_size): P.W_input_in = U.initial_weights(word_vector_size,hidden_state_size) P.W_hidden_in = U.initial_weights(hidden_state_size,hidden_state_size) P.W_cell_in = U.initial_weights(hidden_state_size,hidden_state_size) P.b_in = U.initial_weights(hidden_state_size) P.W_input_forget = U.initial_weights(word_vector_size,hidden_state_size) P.W_hidden_forget = U.initial_weights(hidden_state_size,hidden_state_size) P.W_cell_forget = U.initial_weights(hidden_state_size,hidden_state_size) P.b_forget = U.initial_weights(hidden_state_size) P.W_input_output = U.initial_weights(word_vector_size,hidden_state_size) P.W_hidden_output = U.initial_weights(hidden_state_size,hidden_state_size) P.W_cell_output = U.initial_weights(hidden_state_size,hidden_state_size) P.b_output = U.initial_weights(hidden_state_size) P.W_input_cell = U.initial_weights(word_vector_size,hidden_state_size) P.W_hidden_cell = U.initial_weights(hidden_state_size,hidden_state_size) P.b_cell = U.initial_weights(hidden_state_size) P.init_h = U.initial_weights(hidden_state_size) P.init_c = U.initial_weights(hidden_state_size) def step(x,prev_h,prev_c): input_gate = T.nnet.sigmoid( T.dot(x,P.W_input_in) +\ T.dot(prev_h,P.W_hidden_in) +\ T.dot(prev_c,P.W_cell_in) +\ P.b_in ) forget_gate = T.nnet.sigmoid( T.dot(x,P.W_input_forget) +\ T.dot(prev_h,P.W_hidden_forget) +\ T.dot(prev_c,P.W_cell_forget) +\ P.b_forget ) curr_c = forget_gate * prev_c + input_gate * T.tanh( T.dot(x,P.W_input_cell) +\ T.dot(prev_h,P.W_hidden_cell) +\ P.b_cell ) output_gate = T.nnet.sigmoid( T.dot(x,P.W_input_output) +\ T.dot(prev_h,P.W_hidden_output) +\ T.dot(curr_c,P.W_cell_output) +\ P.b_output ) curr_h = output_gate * T.tanh(curr_c) return curr_h,curr_c return step
def create_vocab_vectors(P,vocab2id,size): return U.initial_weights(len(vocab2id) + 1,size)
def create_vocab_vectors(P, vocab2id, size):
return U.initial_weights(len(vocab2id) + 1, size)
def build_lstm_step(P, word_vector_size, hidden_state_size):
P.W_input_in = U.initial_weights(word_vector_size, hidden_state_size)
P.W_hidden_in = U.initial_weights(hidden_state_size, hidden_state_size)
P.W_cell_in = U.initial_weights(hidden_state_size, hidden_state_size)
P.b_in = U.initial_weights(hidden_state_size)
P.W_input_forget = U.initial_weights(word_vector_size, hidden_state_size)
P.W_hidden_forget = U.initial_weights(hidden_state_size, hidden_state_size)
P.W_cell_forget = U.initial_weights(hidden_state_size, hidden_state_size)
P.b_forget = U.initial_weights(hidden_state_size)
P.W_input_output = U.initial_weights(word_vector_size, hidden_state_size)
P.W_hidden_output = U.initial_weights(hidden_state_size, hidden_state_size)
P.W_cell_output = U.initial_weights(hidden_state_size, hidden_state_size)
P.b_output = U.initial_weights(hidden_state_size)
P.W_input_cell = U.initial_weights(word_vector_size, hidden_state_size)
P.W_hidden_cell = U.initial_weights(hidden_state_size, hidden_state_size)
P.b_cell = U.initial_weights(hidden_state_size)
P.init_h = U.initial_weights(hidden_state_size)
P.init_c = U.initial_weights(hidden_state_size)
def step(x, prev_h, prev_c):
input_gate = T.nnet.sigmoid(
T.dot(x,P.W_input_in) +\
T.dot(prev_h,P.W_hidden_in) +\
T.dot(prev_c,P.W_cell_in) +\
P.b_in
)
forget_gate = T.nnet.sigmoid(
T.dot(x,P.W_input_forget) +\
T.dot(prev_h,P.W_hidden_forget) +\
T.dot(prev_c,P.W_cell_forget) +\
P.b_forget
)
curr_c = forget_gate * prev_c + input_gate * T.tanh(
T.dot(x,P.W_input_cell) +\
T.dot(prev_h,P.W_hidden_cell) +\
P.b_cell
)
output_gate = T.nnet.sigmoid(
T.dot(x,P.W_input_output) +\
T.dot(prev_h,P.W_hidden_output) +\
T.dot(curr_c,P.W_cell_output) +\
P.b_output
)
curr_h = output_gate * T.tanh(curr_c)
return curr_h, curr_c
return step
def build(P,input_size,mem_width,mem_size,shift_width):
"""
NTM heads are implemented as another hidden layer coming after
the last hidden layer of the controller that emits
k_t, beta_t, g_t, s_t, gamma_t as outputs (see Controller outputs
of Figure 2 in paper) along with erase and add vectors
"""
P["W_key"] = U.initial_weights(input_size,mem_width)
P["b_key"] = 0. * U.initial_weights(mem_width)
P["W_beta"] = 0. * U.initial_weights(input_size)
P["b_beta"] = 0.
P["W_g"] = U.initial_weights(input_size)
P["b_g"] = 0.
P["W_shift"] = U.initial_weights(input_size,shift_width)
P["b_shift"] = 0. * U.initial_weights(shift_width)
P["W_gamma"] = U.initial_weights(input_size)
P["b_gamma"] = 0.
P["W_erase"] = U.initial_weights(input_size,mem_width)
P["b_erase"] = 0. * U.initial_weights(mem_width)
P["W_add"] = U.initial_weights(input_size,mem_width)
P["b_add"] = 0. * U.initial_weights(mem_width)
def head_params(x):
"""
Takes hidden layer from controller computes
k_t, beta_t, g_t, s_t, and erase and add
vectors as outputs
"""
# key
key_t = T.dot(x,P["W_key"]) + P["b_key"]
# key strength
_beta_t = T.dot(x,P["W_beta"]) + P["b_beta"]
beta_t = T.nnet.softplus(_beta_t)
# interpolation gate
g_t = T.nnet.sigmoid(T.dot(x,P["W_g"]) + P["b_g"])
# shift
shift_t = U.vector_softmax(T.dot(x,P["W_shift"]) + P["b_shift"])
shift_t.name = "shift_t"
# sharpening
_gamma_t = T.dot(x,P["W_gamma"]) + P["b_gamma"]
gamma_t = T.nnet.softplus(_gamma_t) + 1.
# erase and add vectors
erase_t = T.nnet.sigmoid(T.dot(x,P["W_erase"]) + P["b_erase"])
add_t = T.dot(x,P["W_add"]) + P["b_add"]
return key_t,beta_t,g_t,shift_t,gamma_t,erase_t,add_t
return head_params
