def new_episode(self, mem, all_h=False):
'''
Create a new episode
Compute the g using the attention mechanism
Compute the new state h_t^i of the mem update mechanism
Use it to compute e^i = h_T_C^i (see paper AMA:DMN for QA)
:param mem: current memory
:return e[-1]: latest episode
'''
#g_updates seems useless.
g, g_updates = theano.scan(fn=self.new_attention_step,
sequences=self.inp_c,
non_sequences=[mem, self.q_q],
outputs_info=T.zeros_like(self.inp_c[0][0]))
#Softmax if normalize_attention?
if (self.normalize_attention):
g = nn_utils.softmax(g)
#e_updates seems useless.
e, e_updates = theano.scan(fn=self.new_episode_step,
sequences=[self.inp_c, g],
outputs_info=T.zeros_like(self.inp_c[0]))
return e[-1]
def answer_step(prev_a, prev_y):
a = nn_utils.GRU_update(
prev_a, T.concatenate([prev_y, self.q_q, self.last_mem]),
self.W_ans_res_in, self.W_ans_res_hid, self.b_ans_res,
self.W_ans_upd_in, self.W_ans_upd_hid, self.b_ans_upd,
self.W_ans_hid_in, self.W_ans_hid_hid, self.b_ans_hid)
y = nn_utils.softmax(T.dot(self.W_a, a))
return [a, y]
def transformer(src, target, n):
z = src
for i in range(n):
z = encoder(z)
z_enc = z
z = target
for i in range(n):
z = decoder(z)
z = linear(z)
z = nn_utils.softmax(z)
return z
def new_episode(self, mem):
g, g_updates = theano.scan(fn=self.new_attention_step,
sequences=self.inp_c,
non_sequences=[mem, self.q_q, self.c_vecs],
outputs_info=T.zeros_like(self.inp_c[0][0]))
if (self.normalize_attention):
g = nn_utils.softmax(g)
e, e_updates = theano.scan(fn=self.new_episode_step,
sequences=[self.inp_c, g],
outputs_info=T.zeros_like(self.inp_c[0]))
return e[-1]
def new_episode(self, mem):
g, g_updates = theano.scan(fn=self.new_attention_step,
sequences=self.inp_c,
non_sequences=[mem, self.q_q],
outputs_info=T.zeros_like(self.inp_c[0][0]))
if (self.normalize_attention):
g = nn_utils.softmax(g)
e, e_updates = theano.scan(fn=self.new_episode_step,
sequences=[self.inp_c, g],
outputs_info=T.zeros_like(self.inp_c[0]))
e_list = []
for index in range(self.batch_size):
e_list.append(e[self.fact_count_var[index] - 1, :, index])
return T.stack(e_list).dimshuffle((1, 0))
def __init__(self, babi_train_raw, babi_test_raw, word2vec,
word_vector_size, dim, mode, answer_module, input_mask_mode,
memory_hops, batch_size, l2, normalize_attention, batch_norm,
dropout, **kwargs):
print "==> not used params in DMN class:", kwargs.keys()
self.vocab = {}
self.ivocab = {}
self.type = "batch"
self.word2vec = word2vec
self.word_vector_size = word_vector_size
self.dim = dim
self.mode = mode
self.answer_module = answer_module
self.input_mask_mode = input_mask_mode
self.memory_hops = memory_hops
self.batch_size = batch_size
self.l2 = l2
self.normalize_attention = normalize_attention
self.batch_norm = batch_norm
self.dropout = dropout
self.train_input, self.train_q, self.train_answer, self.train_fact_count, self.train_input_mask = self._process_input(
babi_train_raw)
self.test_input, self.test_q, self.test_answer, self.test_fact_count, self.test_input_mask = self._process_input(
babi_test_raw)
self.vocab_size = len(self.vocab)
self.input_var = T.tensor3(
'input_var') # (batch_size, seq_len, glove_dim)
self.q_var = T.tensor3('question_var') # as self.input_var
self.answer_var = T.ivector(
'answer_var') # answer of example in minibatch
self.fact_count_var = T.ivector(
'fact_count_var') # number of facts in the example of minibatch
self.input_mask_var = T.imatrix(
'input_mask_var') # (batch_size, indices)
print "==> building input module"
self.W_inp_res_in = nn_utils.normal_param(
std=0.1, shape=(self.dim, self.word_vector_size))
self.W_inp_res_hid = nn_utils.normal_param(std=0.1,
shape=(self.dim, self.dim))
self.b_inp_res = nn_utils.constant_param(value=0.0, shape=(self.dim, ))
self.W_inp_upd_in = nn_utils.normal_param(
std=0.1, shape=(self.dim, self.word_vector_size))
self.W_inp_upd_hid = nn_utils.normal_param(std=0.1,
shape=(self.dim, self.dim))
self.b_inp_upd = nn_utils.constant_param(value=0.0, shape=(self.dim, ))
self.W_inp_hid_in = nn_utils.normal_param(
std=0.1, shape=(self.dim, self.word_vector_size))
self.W_inp_hid_hid = nn_utils.normal_param(std=0.1,
shape=(self.dim, self.dim))
self.b_inp_hid = nn_utils.constant_param(value=0.0, shape=(self.dim, ))
input_var_shuffled = self.input_var.dimshuffle(1, 2, 0)
inp_dummy = theano.shared(
np.zeros((self.dim, self.batch_size), dtype=floatX))
inp_c_history, _ = theano.scan(fn=self.input_gru_step,
sequences=input_var_shuffled,
outputs_info=T.zeros_like(inp_dummy))
inp_c_history_shuffled = inp_c_history.dimshuffle(2, 0, 1)
inp_c_list = []
inp_c_mask_list = []
for batch_index in range(self.batch_size):
taken = inp_c_history_shuffled[batch_index].take(
self.input_mask_var[
batch_index, :self.fact_count_var[batch_index]],
axis=0)
inp_c_list.append(
T.concatenate([
taken,
T.zeros((self.input_mask_var.shape[1] - taken.shape[0],
self.dim), floatX)
]))
inp_c_mask_list.append(
T.concatenate([
T.ones((taken.shape[0], ), np.int32),
T.zeros((self.input_mask_var.shape[1] - taken.shape[0], ),
np.int32)
]))
self.inp_c = T.stack(inp_c_list).dimshuffle(1, 2, 0)
inp_c_mask = T.stack(inp_c_mask_list).dimshuffle(1, 0)
q_var_shuffled = self.q_var.dimshuffle(1, 2, 0)
q_dummy = theano.shared(
np.zeros((self.dim, self.batch_size), dtype=floatX))
q_q_history, _ = theano.scan(fn=self.input_gru_step,
sequences=q_var_shuffled,
outputs_info=T.zeros_like(q_dummy))
self.q_q = q_q_history[-1]
print "==> creating parameters for memory module"
self.W_mem_res_in = nn_utils.normal_param(std=0.1,
shape=(self.dim, self.dim))
self.W_mem_res_hid = nn_utils.normal_param(std=0.1,
shape=(self.dim, self.dim))
self.b_mem_res = nn_utils.constant_param(value=0.0, shape=(self.dim, ))
self.W_mem_upd_in = nn_utils.normal_param(std=0.1,
shape=(self.dim, self.dim))
self.W_mem_upd_hid = nn_utils.normal_param(std=0.1,
shape=(self.dim, self.dim))
self.b_mem_upd = nn_utils.constant_param(value=0.0, shape=(self.dim, ))
self.W_mem_hid_in = nn_utils.normal_param(std=0.1,
shape=(self.dim, self.dim))
self.W_mem_hid_hid = nn_utils.normal_param(std=0.1,
shape=(self.dim, self.dim))
self.b_mem_hid = nn_utils.constant_param(value=0.0, shape=(self.dim, ))
self.W_b = nn_utils.normal_param(std=0.1, shape=(self.dim, self.dim))
self.W_1 = nn_utils.normal_param(std=0.1,
shape=(self.dim, 7 * self.dim + 0))
self.W_2 = nn_utils.normal_param(std=0.1, shape=(1, self.dim))
self.b_1 = nn_utils.constant_param(value=0.0, shape=(self.dim, ))
self.b_2 = nn_utils.constant_param(value=0.0, shape=(1, ))
print "==> building episodic memory module (fixed number of steps: %d)" % self.memory_hops
memory = [self.q_q.copy()]
for iter in range(1, self.memory_hops + 1):
current_episode = self.new_episode(memory[iter - 1])
memory.append(
self.GRU_update(memory[iter - 1], current_episode,
self.W_mem_res_in, self.W_mem_res_hid,
self.b_mem_res, self.W_mem_upd_in,
self.W_mem_upd_hid, self.b_mem_upd,
self.W_mem_hid_in, self.W_mem_hid_hid,
self.b_mem_hid))
last_mem_raw = memory[-1].dimshuffle((1, 0))
net = layers.InputLayer(shape=(self.batch_size, self.dim),
input_var=last_mem_raw)
if self.batch_norm:
net = layers.BatchNormLayer(incoming=net)
if self.dropout > 0 and self.mode == 'train':
net = layers.DropoutLayer(net, p=self.dropout)
last_mem = layers.get_output(net).dimshuffle((1, 0))
print "==> building answer module"
self.W_a = nn_utils.normal_param(std=0.1,
shape=(self.vocab_size, self.dim))
if self.answer_module == 'feedforward':
self.prediction = nn_utils.softmax(T.dot(self.W_a, last_mem))
elif self.answer_module == 'recurrent':
self.W_ans_res_in = nn_utils.normal_param(
std=0.1, shape=(self.dim, self.dim + self.vocab_size))
self.W_ans_res_hid = nn_utils.normal_param(std=0.1,
shape=(self.dim,
self.dim))
self.b_ans_res = nn_utils.constant_param(value=0.0,
shape=(self.dim, ))
self.W_ans_upd_in = nn_utils.normal_param(
std=0.1, shape=(self.dim, self.dim + self.vocab_size))
self.W_ans_upd_hid = nn_utils.normal_param(std=0.1,
shape=(self.dim,
self.dim))
self.b_ans_upd = nn_utils.constant_param(value=0.0,
shape=(self.dim, ))
self.W_ans_hid_in = nn_utils.normal_param(
std=0.1, shape=(self.dim, self.dim + self.vocab_size))
self.W_ans_hid_hid = nn_utils.normal_param(std=0.1,
shape=(self.dim,
self.dim))
self.b_ans_hid = nn_utils.constant_param(value=0.0,
shape=(self.dim, ))
def answer_step(prev_a, prev_y):
a = self.GRU_update(prev_a, T.concatenate([prev_y, self.q_q]),
self.W_ans_res_in, self.W_ans_res_hid,
self.b_ans_res, self.W_ans_upd_in,
self.W_ans_upd_hid, self.b_ans_upd,
self.W_ans_hid_in, self.W_ans_hid_hid,
self.b_ans_hid)
y = nn_utils.softmax(T.dot(self.W_a, a))
return [a, y]
# TODO: add conditional ending
dummy = theano.shared(
np.zeros((self.vocab_size, self.batch_size), dtype=floatX))
results, updates = theano.scan(
fn=self.answer_step,
outputs_info=[last_mem, T.zeros_like(dummy)], #(last_mem, y)
n_steps=1)
self.prediction = results[1][-1]
else:
raise Exception("invalid answer_module")
self.prediction = self.prediction.dimshuffle(1, 0)
self.params = [
self.W_inp_res_in,
self.W_inp_res_hid,
self.b_inp_res,
self.W_inp_upd_in,
self.W_inp_upd_hid,
self.b_inp_upd,
self.W_inp_hid_in,
self.W_inp_hid_hid,
self.b_inp_hid,
self.W_mem_res_in,
self.W_mem_res_hid,
self.b_mem_res,
self.W_mem_upd_in,
self.W_mem_upd_hid,
self.b_mem_upd,
self.W_mem_hid_in,
self.W_mem_hid_hid,
self.b_mem_hid, #self.W_b
self.W_1,
self.W_2,
self.b_1,
self.b_2,
self.W_a
]
if self.answer_module == 'recurrent':
self.params = self.params + [
self.W_ans_res_in, self.W_ans_res_hid, self.b_ans_res,
self.W_ans_upd_in, self.W_ans_upd_hid, self.b_ans_upd,
self.W_ans_hid_in, self.W_ans_hid_hid, self.b_ans_hid
]
print "==> building loss layer and computing updates"
self.loss_ce = T.nnet.categorical_crossentropy(self.prediction,
self.answer_var).mean()
if self.l2 > 0:
self.loss_l2 = self.l2 * nn_utils.l2_reg(self.params)
else:
self.loss_l2 = 0
self.loss = self.loss_ce + self.loss_l2
updates = lasagne.updates.adadelta(self.loss, self.params)
#updates = lasagne.updates.momentum(self.loss, self.params, learning_rate=0.001)
if self.mode == 'train':
print "==> compiling train_fn"
self.train_fn = theano.function(
inputs=[
self.input_var, self.q_var, self.answer_var,
self.fact_count_var, self.input_mask_var
],
outputs=[self.prediction, self.loss],
updates=updates)
print "==> compiling test_fn"
self.test_fn = theano.function(inputs=[
self.input_var, self.q_var, self.answer_var, self.fact_count_var,
self.input_mask_var
],
outputs=[self.prediction, self.loss])
def __init__(self, babi_train_raw, babi_test_raw, word2vec,
word_vector_size, dim, mode, answer_module, input_mask_mode,
memory_hops, l2, normalize_attention, batch_norm, dropout,
**kwargs):
print "==> not used params in DMN class:", kwargs.keys()
self.vocab = {}
self.ivocab = {}
self.word2vec = word2vec
self.word_vector_size = word_vector_size
self.dim = dim
self.mode = mode
self.answer_module = answer_module
self.input_mask_mode = input_mask_mode
self.memory_hops = memory_hops
self.l2 = l2
self.normalize_attention = normalize_attention
self.batch_norm = batch_norm
self.dropout = dropout
self.train_input, self.train_q, self.train_answer, self.train_input_mask = self._process_input(
babi_train_raw)
self.test_input, self.test_q, self.test_answer, self.test_input_mask = self._process_input(
babi_test_raw)
self.vocab_size = len(self.vocab)
self.input_var = T.matrix('input_var')
self.q_var = T.matrix('question_var')
self.answer_var = T.iscalar('answer_var')
self.input_mask_var = T.ivector('input_mask_var')
self.attentions = []
print "==> building input module"
self.W_inp_res_in = nn_utils.normal_param(
std=0.1, shape=(self.dim, self.word_vector_size))
self.W_inp_res_hid = nn_utils.normal_param(std=0.1,
shape=(self.dim, self.dim))
self.b_inp_res = nn_utils.constant_param(value=0.0, shape=(self.dim, ))
self.W_inp_upd_in = nn_utils.normal_param(
std=0.1, shape=(self.dim, self.word_vector_size))
self.W_inp_upd_hid = nn_utils.normal_param(std=0.1,
shape=(self.dim, self.dim))
self.b_inp_upd = nn_utils.constant_param(value=0.0, shape=(self.dim, ))
self.W_inp_hid_in = nn_utils.normal_param(
std=0.1, shape=(self.dim, self.word_vector_size))
self.W_inp_hid_hid = nn_utils.normal_param(std=0.1,
shape=(self.dim, self.dim))
self.b_inp_hid = nn_utils.constant_param(value=0.0, shape=(self.dim, ))
inp_c_history, _ = theano.scan(fn=self.input_gru_step,
sequences=self.input_var,
outputs_info=T.zeros_like(
self.b_inp_hid))
self.inp_c = inp_c_history.take(self.input_mask_var, axis=0)
self.q_q, _ = theano.scan(fn=self.input_gru_step,
sequences=self.q_var,
outputs_info=T.zeros_like(self.b_inp_hid))
self.q_q = self.q_q[-1]
print "==> creating parameters for memory module"
self.W_mem_res_in = nn_utils.normal_param(std=0.1,
shape=(self.dim, self.dim))
self.W_mem_res_hid = nn_utils.normal_param(std=0.1,
shape=(self.dim, self.dim))
self.b_mem_res = nn_utils.constant_param(value=0.0, shape=(self.dim, ))
self.W_mem_upd_in = nn_utils.normal_param(std=0.1,
shape=(self.dim, self.dim))
self.W_mem_upd_hid = nn_utils.normal_param(std=0.1,
shape=(self.dim, self.dim))
self.b_mem_upd = nn_utils.constant_param(value=0.0, shape=(self.dim, ))
self.W_mem_hid_in = nn_utils.normal_param(std=0.1,
shape=(self.dim, self.dim))
self.W_mem_hid_hid = nn_utils.normal_param(std=0.1,
shape=(self.dim, self.dim))
self.b_mem_hid = nn_utils.constant_param(value=0.0, shape=(self.dim, ))
self.W_b = nn_utils.normal_param(std=0.1, shape=(self.dim, self.dim))
self.W_1 = nn_utils.normal_param(std=0.1,
shape=(self.dim, 7 * self.dim + 0))
self.W_2 = nn_utils.normal_param(std=0.1, shape=(1, self.dim))
self.b_1 = nn_utils.constant_param(value=0.0, shape=(self.dim, ))
self.b_2 = nn_utils.constant_param(value=0.0, shape=(1, ))
print "==> building episodic memory module (fixed number of steps: %d)" % self.memory_hops
memory = [self.q_q.copy()]
for iter in range(1, self.memory_hops + 1):
current_episode = self.new_episode(memory[iter - 1])
memory.append(
self.GRU_update(memory[iter - 1], current_episode,
self.W_mem_res_in, self.W_mem_res_hid,
self.b_mem_res, self.W_mem_upd_in,
self.W_mem_upd_hid, self.b_mem_upd,
self.W_mem_hid_in, self.W_mem_hid_hid,
self.b_mem_hid))
last_mem_raw = memory[-1].dimshuffle(('x', 0))
net = layers.InputLayer(shape=(1, self.dim), input_var=last_mem_raw)
if self.dropout > 0 and self.mode == 'train':
net = layers.DropoutLayer(net, p=self.dropout)
last_mem = layers.get_output(net)[0]
print "==> building answer module"
self.W_a = nn_utils.normal_param(std=0.1,
shape=(self.vocab_size, self.dim))
if self.answer_module == 'feedforward':
self.prediction = nn_utils.softmax(T.dot(self.W_a, last_mem))
elif self.answer_module == 'recurrent':
self.W_ans_res_in = nn_utils.normal_param(
std=0.1, shape=(self.dim, self.dim + self.vocab_size))
self.W_ans_res_hid = nn_utils.normal_param(std=0.1,
shape=(self.dim,
self.dim))
self.b_ans_res = nn_utils.constant_param(value=0.0,
shape=(self.dim, ))
self.W_ans_upd_in = nn_utils.normal_param(
std=0.1, shape=(self.dim, self.dim + self.vocab_size))
self.W_ans_upd_hid = nn_utils.normal_param(std=0.1,
shape=(self.dim,
self.dim))
self.b_ans_upd = nn_utils.constant_param(value=0.0,
shape=(self.dim, ))
self.W_ans_hid_in = nn_utils.normal_param(
std=0.1, shape=(self.dim, self.dim + self.vocab_size))
self.W_ans_hid_hid = nn_utils.normal_param(std=0.1,
shape=(self.dim,
self.dim))
self.b_ans_hid = nn_utils.constant_param(value=0.0,
shape=(self.dim, ))
def answer_step(prev_a, prev_y):
a = self.GRU_update(prev_a, T.concatenate([prev_y, self.q_q]),
self.W_ans_res_in, self.W_ans_res_hid,
self.b_ans_res, self.W_ans_upd_in,
self.W_ans_upd_hid, self.b_ans_upd,
self.W_ans_hid_in, self.W_ans_hid_hid,
self.b_ans_hid)
y = nn_utils.softmax(T.dot(self.W_a, a))
return [a, y]
# TODO: add conditional ending
dummy = theano.shared(np.zeros((self.vocab_size, ), dtype=floatX))
results, updates = theano.scan(
fn=answer_step,
outputs_info=[last_mem, T.zeros_like(dummy)],
n_steps=1)
self.prediction = results[1][-1]
else:
raise Exception("invalid answer_module")
print "==> collecting all parameters"
self.params = [
self.W_inp_res_in,
self.W_inp_res_hid,
self.b_inp_res,
self.W_inp_upd_in,
self.W_inp_upd_hid,
self.b_inp_upd,
self.W_inp_hid_in,
self.W_inp_hid_hid,
self.b_inp_hid,
self.W_mem_res_in,
self.W_mem_res_hid,
self.b_mem_res,
self.W_mem_upd_in,
self.W_mem_upd_hid,
self.b_mem_upd,
self.W_mem_hid_in,
self.W_mem_hid_hid,
self.b_mem_hid, #self.W_b
self.W_1,
self.W_2,
self.b_1,
self.b_2,
self.W_a
]
if self.answer_module == 'recurrent':
self.params = self.params + [
self.W_ans_res_in, self.W_ans_res_hid, self.b_ans_res,
self.W_ans_upd_in, self.W_ans_upd_hid, self.b_ans_upd,
self.W_ans_hid_in, self.W_ans_hid_hid, self.b_ans_hid
]
print "==> building loss layer and computing updates"
self.loss_ce = T.nnet.categorical_crossentropy(
self.prediction.dimshuffle('x', 0), T.stack([self.answer_var]))[0]
if self.l2 > 0:
self.loss_l2 = self.l2 * nn_utils.l2_reg(self.params)
else:
self.loss_l2 = 0
self.loss = self.loss_ce + self.loss_l2
updates = lasagne.updates.adadelta(self.loss, self.params)
#updates = lasagne.updates.momentum(self.loss, self.params, learning_rate=0.0003)
if self.mode == 'train':
print "==> compiling train_fn"
self.train_fn = theano.function(
inputs=[
self.input_var, self.q_var, self.answer_var,
self.input_mask_var
],
outputs=[self.prediction, self.loss],
updates=updates)
self.attentions = T.stack(self.attentions)
print "==> compiling test_fn"
self.test_fn = theano.function(
inputs=[
self.input_var, self.q_var, self.answer_var,
self.input_mask_var
],
outputs=[self.prediction, self.loss, self.attentions])
def __init__(self, babi_train_raw, babi_test_raw, word2vec,
word_vector_size, dim, mode, answer_module, answer_step_nbr,
input_mask_mode, memory_hops, l2, normalize_attention,
max_input_size, **kwargs):
'''
Build the DMN
:param babi_train_raw: train dataset
:param babi_test_raw: test dataset
:param word2vec: a dictionary containing the word embeddings TODO: Check if right
:param word_vector_size: dimension of the word embeddings (50,100,200,300)
:param dim: number of hidden units in input module GRU
:param mode: train or test mode
:param answer_module: answer module type: feedforward or recurrent
:param input_mask_mode: input_mask_mode: word or sentence
:param memory_hops: memory GRU steps
:param l2: L2 regularization
:param normalize_attention: enable softmax on attention vector
:param **kwargs:
'''
print("==> not used params in DMN class:", kwargs.keys())
self.type = "pointer"
self.vocab = {}
self.ivocab = {}
print(max_input_size)
#save params
self.word2vec = word2vec
self.word_vector_size = word_vector_size
self.dim = dim #number of hidden units in input layer GRU
self.pointer_dim = max_input_size #maximal size for the input, used as hyperparameter
self.mode = mode
self.answer_module = answer_module
self.answer_step_nbr = answer_step_nbr
self.input_mask_mode = input_mask_mode
self.memory_hops = memory_hops
self.l2 = l2
self.normalize_attention = normalize_attention
self.train_input, self.train_q, self.train_answer, self.train_input_mask, self.train_pointers_s, self.train_pointers_e = self._process_input(
babi_train_raw)
self.test_input, self.test_q, self.test_answer, self.test_input_mask, self.test_pointers_s, self.test_pointers_e = self._process_input(
babi_test_raw)
self.vocab_size = len(self.vocab)
self.input_var = T.matrix('input_var')
self.q_var = T.matrix('question_var')
self.answer_var = T.ivector('answer_var')
self.input_mask_var = T.ivector('input_mask_var')
self.pointers_s_var = T.ivector('pointers_s_var')
self.pointers_e_var = T.ivector('pointer_e_var')
print("==> building input module")
self.W_inp_res_in = nn_utils.normal_param(
std=0.1, shape=(self.dim, self.word_vector_size))
self.W_inp_res_hid = nn_utils.normal_param(std=0.1,
shape=(self.dim, self.dim))
self.b_inp_res = nn_utils.constant_param(value=0.0, shape=(self.dim, ))
self.W_inp_upd_in = nn_utils.normal_param(
std=0.1, shape=(self.dim, self.word_vector_size))
self.W_inp_upd_hid = nn_utils.normal_param(std=0.1,
shape=(self.dim, self.dim))
self.b_inp_upd = nn_utils.constant_param(value=0.0, shape=(self.dim, ))
self.W_inp_hid_in = nn_utils.normal_param(
std=0.1, shape=(self.dim, self.word_vector_size))
self.W_inp_hid_hid = nn_utils.normal_param(std=0.1,
shape=(self.dim, self.dim))
self.b_inp_hid = nn_utils.constant_param(value=0.0, shape=(self.dim, ))
#TODO why 3 different set of weights & bias?
#This does some loop
inp_c_history, _ = theano.scan(fn=self.input_gru_step,
sequences=self.input_var,
outputs_info=T.zeros_like(
self.b_inp_hid))
#in case of multiple sentences, only keep the hidden states which index match the <eos> char
self.inp_c = inp_c_history.take(self.input_mask_var, axis=0)
#This seems to be the memory.
self.q_q, _ = theano.scan(fn=self.input_gru_step,
sequences=self.q_var,
outputs_info=T.zeros_like(self.b_inp_hid))
self.q_q = self.q_q[-1] #take only last elem
print("==> creating parameters for memory module")
self.W_mem_res_in = nn_utils.normal_param(std=0.1,
shape=(self.dim, self.dim))
self.W_mem_res_hid = nn_utils.normal_param(std=0.1,
shape=(self.dim, self.dim))
self.b_mem_res = nn_utils.constant_param(value=0.0, shape=(self.dim, ))
self.W_mem_upd_in = nn_utils.normal_param(std=0.1,
shape=(self.dim, self.dim))
self.W_mem_upd_hid = nn_utils.normal_param(std=0.1,
shape=(self.dim, self.dim))
self.b_mem_upd = nn_utils.constant_param(value=0.0, shape=(self.dim, ))
self.W_mem_hid_in = nn_utils.normal_param(std=0.1,
shape=(self.dim, self.dim))
self.W_mem_hid_hid = nn_utils.normal_param(std=0.1,
shape=(self.dim, self.dim))
self.b_mem_hid = nn_utils.constant_param(value=0.0, shape=(self.dim, ))
#Attnetion mechanisms 2 layer FFNN weights & bias
self.W_b = nn_utils.normal_param(std=0.1, shape=(self.dim, self.dim))
self.W_1 = nn_utils.normal_param(std=0.1,
shape=(self.dim, 7 * self.dim + 2))
self.W_2 = nn_utils.normal_param(std=0.1, shape=(1, self.dim))
self.b_1 = nn_utils.constant_param(value=0.0, shape=(self.dim, ))
self.b_2 = nn_utils.constant_param(value=0.0, shape=(1, ))
print(
"==> building episodic memory module (fixed number of steps: %d)" %
self.memory_hops)
memory = [self.q_q.copy()] #So q_q is memory initialization
for iter in range(1, self.memory_hops + 1):
current_episode = self.new_episode(memory[iter - 1])
memory.append(
nn_utils.GRU_update(memory[iter - 1], current_episode,
self.W_mem_res_in, self.W_mem_res_hid,
self.b_mem_res, self.W_mem_upd_in,
self.W_mem_upd_hid, self.b_mem_upd,
self.W_mem_hid_in, self.W_mem_hid_hid,
self.b_mem_hid))
self.last_mem = memory[-1]
print("==> building answer module")
self.Ws_p = nn_utils.normal_param(
std=0.1,
shape=(self.pointer_dim,
self.dim)) #shape must be size_input * mem_size = self.dim
self.We_p = nn_utils.normal_param(std=0.1,
shape=(self.pointer_dim, self.dim))
self.Wh_p = nn_utils.normal_param(std=0.1,
shape=(self.pointer_dim, self.dim))
self.Ws_pr = nn_utils.normal_param(
std=0.1,
shape=(self.pointer_dim,
self.dim)) #shape must be size_input * mem_size = self.dim
self.We_pr = nn_utils.normal_param(std=0.1,
shape=(self.pointer_dim, self.dim))
self.Wh_pr = nn_utils.normal_param(std=0.1,
shape=(self.pointer_dim, self.dim))
self.Psp = nn_utils.softmax(T.dot(
self.Ws_p, self.last_mem)) #size must be == size_input
self.Pepr = nn_utils.softmax(T.dot(self.We_pr, self.last_mem))
#TODO:
self.start_idx = T.argmax(self.Psp)
self.end_idxr = T.argmax(self.Pepr)
self.start_idx_state = inp_c_history[
self.
start_idx] #must be hidden state idx idx_max_val(Psp) self.last_mem#
self.end_idx_state = inp_c_history[self.end_idxr]
#temp1 = T.dot(self.We_p, self.last_mem)
#temp2 = T.dot(self.Wh_p, self.start_idx_state)
#temp3 = temp1 + temp2
self.Pep = nn_utils.softmax(
T.dot(self.We_p, self.last_mem) + T.dot(
self.Wh_p, self.start_idx_state)) #size must be == size_input
self.Pspr = nn_utils.softmax(
T.dot(self.Ws_pr, self.last_mem) +
T.dot(self.Wh_pr, self.end_idx_state))
Ps = (self.Psp + self.Pspr) / 2
Pe = (self.Pep + self.Pepr) / 2
self.start_idxr = T.argmax(self.Pspr)
self.end_idx = T.argmax(self.Pep)
self.start_idx_f = T.argmax(Ps) #(self.start_idx + self.start_idxr)/2
self.end_idx_f = T.argmax(Pe) #(self.end_idx + self.end_idxr)/2
#multiple_answers = []
#bboole = T.lt(self.start_idx_f, self.end_idx_f)
#trange = ifelse(bboole, T.arange(self.start_idx_f, self.end_idx_f), T.arange(self.start_idx_f - 1, self.start_idx_f))
# self.W_a = nn_utils.normal_param(std=0.1, shape=(self.vocab_size, self.dim))
#
# if self.answer_module == 'recurrent':
# self.W_ans_res_in = nn_utils.normal_param(std=0.1, shape=(self.dim, self.dim + self.dim + self.vocab_size))
# self.W_ans_res_hid = nn_utils.normal_param(std=0.1, shape=(self.dim, self.dim))
# self.b_ans_res = nn_utils.constant_param(value=0.0, shape=(self.dim,))
#
# self.W_ans_upd_in = nn_utils.normal_param(std=0.1, shape=(self.dim, self.dim + self.dim + self.vocab_size))
# self.W_ans_upd_hid = nn_utils.normal_param(std=0.1, shape=(self.dim, self.dim))
# self.b_ans_upd = nn_utils.constant_param(value=0.0, shape=(self.dim,))
#
# self.W_ans_hid_in = nn_utils.normal_param(std=0.1, shape=(self.dim, self.dim + self.dim + self.vocab_size))
# self.W_ans_hid_hid = nn_utils.normal_param(std=0.1, shape=(self.dim, self.dim))
# self.b_ans_hid = nn_utils.constant_param(value=0.0, shape=(self.dim,))
#
# def answer_step(prev_a, prev_y):
# a = nn_utils.GRU_update(prev_a, T.concatenate([prev_y, self.q_q, self.last_mem]),
# self.W_ans_res_in, self.W_ans_res_hid, self.b_ans_res,
# self.W_ans_upd_in, self.W_ans_upd_hid, self.b_ans_upd,
# self.W_ans_hid_in, self.W_ans_hid_hid, self.b_ans_hid)
#
# y = nn_utils.softmax(T.dot(self.W_a, a))
# return [a, y]
#
# # TODO: add conditional ending
# dummy_ = theano.shared(np.zeros((self.vocab_size, ), dtype=floatX))
# results, updates = theano.scan(fn=answer_step,
# outputs_info=[self.last_mem, T.zeros_like(dummy_)],
# n_steps=self.answer_step_nbr)
#
# self.multiple_predictions = results[1] #don't get the memory (i.e. a)
#
#
# else:
# raise Exception("invalid answer_module")
print("==> collecting all parameters")
self.params = [
self.W_inp_res_in, self.W_inp_res_hid, self.b_inp_res,
self.W_inp_upd_in, self.W_inp_upd_hid, self.b_inp_upd,
self.W_inp_hid_in, self.W_inp_hid_hid, self.b_inp_hid,
self.W_mem_res_in, self.W_mem_res_hid, self.b_mem_res,
self.W_mem_upd_in, self.W_mem_upd_hid, self.b_mem_upd,
self.W_mem_hid_in, self.W_mem_hid_hid, self.b_mem_hid, self.W_b,
self.W_1, self.W_2, self.b_1, self.b_2, self.Ws_p, self.We_p,
self.Wh_p, self.Ws_pr, self.We_pr, self.Wh_pr
]
# if self.answer_module == 'recurrent':
# self.params = self.params + [self.W_ans_res_in, self.W_ans_res_hid, self.b_ans_res,
# self.W_ans_upd_in, self.W_ans_upd_hid, self.b_ans_upd,
# self.W_ans_hid_in, self.W_ans_hid_hid, self.b_ans_hid]
#
#
print("==> building loss layer and computing updates")
# def temp_loss(curr_pred, curr_ans, loss):
# temp = T.nnet.categorical_crossentropy(curr_pred.dimshuffle("x",0),T.stack([curr_ans]))[0]
# return loss + temp
#
# outputs, updates = theano.scan(fn=temp_loss,
# sequences=[self.multiple_predictions, self.answer_var],
# outputs_info = [np.float64(0.0)],
# n_steps=self.answer_step_nbr)
loss_start = T.nnet.categorical_crossentropy(
Ps.dimshuffle("x", 0), T.stack([self.pointers_s_var[0]]))[0]
loss_end = T.nnet.categorical_crossentropy(
Pe.dimshuffle("x", 0), T.stack([self.pointers_e_var[0]]))[0]
#loss_1 = Ps
# def temp_loss(curr_idx, curr_ans, loss):
# curr_pred = self.input_var[curr_idx]
# temp = T.nnet.catergorical_crossentropy(curr_pred, curr_ans)[0]
# return loss + temp
#
# outputs, udpates = theano.scan(fn=temp_loss,
# sequences = [answers_range, self.answer_var],
# outputs_info = [np.float64(0.0)],
# n_steps = ???)
# self.loss_ce = outputs[-1]
#temp1 = (self.end_idx_f - self.pointers_e_var)
#temp2 = T.abs_(temp1) #* temp1
#temp3 = (self.start_idx_f)# - self.pointers_s_var)
#temp4 = T.abs_(temp3) #* temp3
self.loss_ce = loss_start + loss_end #(temp2 + temp4)
if self.l2 > 0:
self.loss_l2 = self.l2 * nn_utils.l2_reg(self.params)
else:
self.loss_l2 = 0
self.loss = self.loss_ce + self.loss_l2
updates = lasagne.updates.adadelta(self.loss, self.params)
if self.mode == 'train':
print("==> compiling train_fn")
self.train_fn = theano.function(
inputs=[
self.input_var, self.q_var, self.input_mask_var,
self.pointers_s_var, self.pointers_e_var
],
outputs=[self.start_idx_f, self.end_idx_f, self.loss],
updates=updates,
allow_input_downcast=True)
if self.mode != 'minitest':
print("==> compiling test_fn")
self.test_fn = theano.function(inputs=[
self.input_var, self.q_var, self.input_mask_var,
self.pointers_s_var, self.pointers_e_var
],
outputs=[
self.start_idx_f,
self.end_idx_f, self.loss,
self.inp_c, self.q_q
],
allow_input_downcast=True)
if self.mode == 'minitest':
print("==> compiling minitest_fn")
self.minitest_fn = theano.function(
inputs=[
self.input_var, self.q_var, self.input_mask_var,
self.pointers_s_var, self.pointers_e_var
],
outputs=[self.start_idx_f, self.end_idx_f])
def __init__(self, babi_train_raw, babi_test_raw, word2vec,
word_vector_size, dim, mode, answer_module, input_mask_mode,
memory_hops, l2, normalize_attention, **kwargs):
'''
Build the DMN
:param babi_train_raw: train dataset
:param babi_test_raw: test dataset
:param word2vec: a dictionary containing the word embeddings TODO: Check if right
:param word_vector_size: dimension of the word embeddings (50,100,200,300)
:param dim: number of hidden units in input module GRU
:param mode: train or test mode
:param answer_module: answer module type: feedforward or recurrent
:param input_mask_mode: input_mask_mode: word or sentence
:param memory_hops: memory GRU steps
:param l2: L2 regularization
:param normalize_attention: enable softmax on attention vector
:param **kwargs:
'''
print("==> not used params in DMN class:", kwargs.keys())
self.vocab = {}
self.ivocab = {}
self.type = "basic"
#save params
self.word2vec = word2vec
self.word_vector_size = word_vector_size
self.dim = dim
self.mode = mode
self.answer_module = answer_module
self.input_mask_mode = input_mask_mode
self.memory_hops = memory_hops
self.l2 = l2
self.normalize_attention = normalize_attention
self.train_input, self.train_q, self.train_answer, self.train_input_mask = self._process_input(
babi_train_raw)
self.test_input, self.test_q, self.test_answer, self.test_input_mask = self._process_input(
babi_test_raw)
self.vocab_size = len(self.vocab)
self.input_var = T.matrix('input_var')
self.q_var = T.matrix('question_var')
self.answer_var = T.iscalar('answer_var')
self.input_mask_var = T.ivector('input_mask_var')
print("==> building input module")
#Input weights for first layer
#TODO why is there an input layer??
self.W_inp_res_in = nn_utils.normal_param(
std=0.1, shape=(self.dim, self.word_vector_size))
#Input weights for hidden layer
self.W_inp_res_hid = nn_utils.normal_param(std=0.1,
shape=(self.dim, self.dim))
#Input bias
#TODO why constant?
self.b_inp_res = nn_utils.constant_param(value=0.0, shape=(self.dim, ))
self.W_inp_upd_in = nn_utils.normal_param(
std=0.1, shape=(self.dim, self.word_vector_size))
self.W_inp_upd_hid = nn_utils.normal_param(std=0.1,
shape=(self.dim, self.dim))
self.b_inp_upd = nn_utils.constant_param(value=0.0, shape=(self.dim, ))
self.W_inp_hid_in = nn_utils.normal_param(
std=0.1, shape=(self.dim, self.word_vector_size))
self.W_inp_hid_hid = nn_utils.normal_param(std=0.1,
shape=(self.dim, self.dim))
self.b_inp_hid = nn_utils.constant_param(value=0.0, shape=(self.dim, ))
#TODO why 3 different set of weights & bias?
#This does some loop
inp_c_history, _ = theano.scan(fn=self.input_gru_step,
sequences=self.input_var,
outputs_info=T.zeros_like(
self.b_inp_hid))
self.inp_c = inp_c_history.take(self.input_mask_var, axis=0)
#This seems to be the memory.
self.q_q, _ = theano.scan(fn=self.input_gru_step,
sequences=self.q_var,
outputs_info=T.zeros_like(self.b_inp_hid))
self.q_q = self.q_q[-1] #take only last elem
print("==> creating parameters for memory module")
self.W_mem_res_in = nn_utils.normal_param(std=0.1,
shape=(self.dim, self.dim))
self.W_mem_res_hid = nn_utils.normal_param(std=0.1,
shape=(self.dim, self.dim))
self.b_mem_res = nn_utils.constant_param(value=0.0, shape=(self.dim, ))
self.W_mem_upd_in = nn_utils.normal_param(std=0.1,
shape=(self.dim, self.dim))
self.W_mem_upd_hid = nn_utils.normal_param(std=0.1,
shape=(self.dim, self.dim))
self.b_mem_upd = nn_utils.constant_param(value=0.0, shape=(self.dim, ))
self.W_mem_hid_in = nn_utils.normal_param(std=0.1,
shape=(self.dim, self.dim))
self.W_mem_hid_hid = nn_utils.normal_param(std=0.1,
shape=(self.dim, self.dim))
self.b_mem_hid = nn_utils.constant_param(value=0.0, shape=(self.dim, ))
#Attnetion mechanisms 2 layer FFNN weights & bias
self.W_b = nn_utils.normal_param(std=0.1, shape=(self.dim, self.dim))
self.W_1 = nn_utils.normal_param(std=0.1,
shape=(self.dim, 7 * self.dim + 2))
self.W_2 = nn_utils.normal_param(std=0.1, shape=(1, self.dim))
self.b_1 = nn_utils.constant_param(value=0.0, shape=(self.dim, ))
self.b_2 = nn_utils.constant_param(value=0.0, shape=(1, ))
print(
"==> building episodic memory module (fixed number of steps: %d)" %
self.memory_hops)
memory = [self.q_q.copy()] #So q_q is memory initialization
for iter in range(1, self.memory_hops + 1):
current_episode = self.new_episode(memory[iter - 1])
memory.append(
nn_utils.GRU_update(memory[iter - 1], current_episode,
self.W_mem_res_in, self.W_mem_res_hid,
self.b_mem_res, self.W_mem_upd_in,
self.W_mem_upd_hid, self.b_mem_upd,
self.W_mem_hid_in, self.W_mem_hid_hid,
self.b_mem_hid))
last_mem = memory[-1]
print("==> building answer module")
self.W_a = nn_utils.normal_param(std=0.1,
shape=(self.vocab_size, self.dim))
if self.answer_module == 'feedforward':
self.prediction = nn_utils.softmax(T.dot(self.W_a, last_mem))
elif self.answer_module == 'recurrent':
self.W_ans_res_in = nn_utils.normal_param(
std=0.1, shape=(self.dim, self.dim + self.vocab_size))
self.W_ans_res_hid = nn_utils.normal_param(std=0.1,
shape=(self.dim,
self.dim))
self.b_ans_res = nn_utils.constant_param(value=0.0,
shape=(self.dim, ))
self.W_ans_upd_in = nn_utils.normal_param(
std=0.1, shape=(self.dim, self.dim + self.vocab_size))
self.W_ans_upd_hid = nn_utils.normal_param(std=0.1,
shape=(self.dim,
self.dim))
self.b_ans_upd = nn_utils.constant_param(value=0.0,
shape=(self.dim, ))
self.W_ans_hid_in = nn_utils.normal_param(
std=0.1, shape=(self.dim, self.dim + self.vocab_size))
self.W_ans_hid_hid = nn_utils.normal_param(std=0.1,
shape=(self.dim,
self.dim))
self.b_ans_hid = nn_utils.constant_param(value=0.0,
shape=(self.dim, ))
def answer_step(prev_a, prev_y):
a = nn_utils.GRU_update(prev_a,
T.concatenate([prev_y, self.q_q
]), self.W_ans_res_in,
self.W_ans_res_hid, self.b_ans_res,
self.W_ans_upd_in, self.W_ans_upd_hid,
self.b_ans_upd, self.W_ans_hid_in,
self.W_ans_hid_hid, self.b_ans_hid)
y = nn_utils.softmax(T.dot(self.W_a, a))
return [a, y]
# TODO: add conditional ending
dummy = theano.shared(np.zeros((self.vocab_size, ), dtype=floatX))
results, updates = theano.scan(
fn=answer_step,
outputs_info=[last_mem, T.zeros_like(dummy)],
n_steps=1)
self.prediction = results[1][-1]
else:
raise Exception("invalid answer_module")
print("==> collecting all parameters")
self.params = [
self.W_inp_res_in, self.W_inp_res_hid, self.b_inp_res,
self.W_inp_upd_in, self.W_inp_upd_hid, self.b_inp_upd,
self.W_inp_hid_in, self.W_inp_hid_hid, self.b_inp_hid,
self.W_mem_res_in, self.W_mem_res_hid, self.b_mem_res,
self.W_mem_upd_in, self.W_mem_upd_hid, self.b_mem_upd,
self.W_mem_hid_in, self.W_mem_hid_hid, self.b_mem_hid, self.W_b,
self.W_1, self.W_2, self.b_1, self.b_2, self.W_a
]
if self.answer_module == 'recurrent':
self.params = self.params + [
self.W_ans_res_in, self.W_ans_res_hid, self.b_ans_res,
self.W_ans_upd_in, self.W_ans_upd_hid, self.b_ans_upd,
self.W_ans_hid_in, self.W_ans_hid_hid, self.b_ans_hid
]
print("==> building loss layer and computing updates")
self.loss_ce = T.nnet.categorical_crossentropy(
self.prediction.dimshuffle('x', 0), T.stack([self.answer_var]))[0]
if self.l2 > 0:
self.loss_l2 = self.l2 * nn_utils.l2_reg(self.params)
else:
self.loss_l2 = 0
self.loss = self.loss_ce + self.loss_l2
updates = lasagne.updates.adadelta(self.loss, self.params)
if self.mode == 'train':
print("==> compiling train_fn")
self.train_fn = theano.function(
inputs=[
self.input_var, self.q_var, self.answer_var,
self.input_mask_var
],
outputs=[self.prediction, self.loss],
updates=updates)
print("==> compiling test_fn")
self.test_fn = theano.function(inputs=[
self.input_var, self.q_var, self.answer_var, self.input_mask_var
],
outputs=[
self.prediction, self.loss,
self.inp_c, self.q_q, last_mem
])
if self.mode == 'train':
print("==> computing gradients (for debugging)")
gradient = T.grad(self.loss, self.params)
self.get_gradient_fn = theano.function(inputs=[
self.input_var, self.q_var, self.answer_var,
self.input_mask_var
],
outputs=gradient)
def feed_forward(z, W1, W2):
h = z.dot(W1)
u = h.dot(W2)
z = nn_utils.softmax(u)
return z
def attention(Q, K, V, f, d_k=1):
col = [i for i in range(len(K.shape))]
col[-2], col[-1] = col[-1], col[-2]
return nn_utils.softmax(f(Q, K.transpose(tuple(col))) / d_k).dot(V)
def __init__(self, babi_train_raw, babi_test_raw, word2vec,
word_vector_size, dim, mode, input_mask_mode, memory_hops, l2,
normalize_attention, **kwargs):
print "==> not used params in DMN class:", kwargs.keys()
self.vocab = {}
self.ivocab = {}
self.word2vec = word2vec
self.word_vector_size = word_vector_size
self.dim = dim
self.mode = mode
self.input_mask_mode = input_mask_mode
self.memory_hops = memory_hops
#self.batch_size = 1
self.l2 = l2
self.normalize_attention = normalize_attention
self.train_input, self.train_q, self.train_answer, self.train_choices, self.train_input_mask = self._process_input(
babi_train_raw)
self.test_input, self.test_q, self.test_answer, self.test_choices, self.test_input_mask = self._process_input(
babi_test_raw)
self.vocab_size = 4 # number of answer choices
self.inp_var = T.matrix('input_var')
self.q_var = T.matrix('question_var')
self.ca_var = T.matrix('ca_var')
self.cb_var = T.matrix('cb_var')
self.cc_var = T.matrix('cc_var')
self.cd_var = T.matrix('cd_var')
self.ans_var = T.iscalar('answer_var')
self.input_mask_var = T.ivector('input_mask_var')
print "==> building input module"
self.W_inp_res_in = theano.shared(lasagne.init.Normal(0.1).sample(
(self.dim, self.word_vector_size)),
borrow=True)
self.W_inp_res_hid = theano.shared(lasagne.init.Normal(0.1).sample(
(self.dim, self.dim)),
borrow=True)
self.b_inp_res = theano.shared(lasagne.init.Constant(0.0).sample(
(self.dim, )),
borrow=True)
self.W_inp_upd_in = theano.shared(lasagne.init.Normal(0.1).sample(
(self.dim, self.word_vector_size)),
borrow=True)
self.W_inp_upd_hid = theano.shared(lasagne.init.Normal(0.1).sample(
(self.dim, self.dim)),
borrow=True)
self.b_inp_upd = theano.shared(lasagne.init.Constant(0.0).sample(
(self.dim, )),
borrow=True)
self.W_inp_hid_in = theano.shared(lasagne.init.Normal(0.1).sample(
(self.dim, self.word_vector_size)),
borrow=True)
self.W_inp_hid_hid = theano.shared(lasagne.init.Normal(0.1).sample(
(self.dim, self.dim)),
borrow=True)
self.b_inp_hid = theano.shared(lasagne.init.Constant(0.0).sample(
(self.dim, )),
borrow=True)
inp_c_history, _ = theano.scan(fn=self.input_gru_step,
sequences=self.inp_var,
outputs_info=T.zeros_like(
self.b_inp_hid))
self.inp_c = inp_c_history.take(self.input_mask_var, axis=0)
self.q_q, _ = theano.scan(fn=self.input_gru_step,
sequences=self.q_var,
outputs_info=T.zeros_like(self.b_inp_hid))
self.q_q = self.q_q[-1]
self.c_vecs = []
for choice in [self.ca_var, self.cb_var, self.cc_var, self.cd_var]:
history, _ = theano.scan(fn=self.input_gru_step,
sequences=choice,
outputs_info=T.zeros_like(self.b_inp_hid))
self.c_vecs.append(history[-1])
self.c_vecs = T.stack(self.c_vecs).transpose((1, 0)) # (dim, 4)
self.inp_c = T.stack([self.inp_c] * 4).transpose(
(1, 2, 0)) # (fact_cnt, dim, 4)
self.q_q = T.stack([self.q_q] * 4).transpose((1, 0)) # (dim, 4)
print "==> creating parameters for memory module"
self.W_mem_res_in = theano.shared(lasagne.init.Normal(0.1).sample(
(self.dim, self.dim)),
borrow=True)
self.W_mem_res_hid = theano.shared(lasagne.init.Normal(0.1).sample(
(self.dim, self.dim)),
borrow=True)
self.b_mem_res = theano.shared(lasagne.init.Constant(0.0).sample(
(self.dim, )),
borrow=True)
self.W_mem_upd_in = theano.shared(lasagne.init.Normal(0.1).sample(
(self.dim, self.dim)),
borrow=True)
self.W_mem_upd_hid = theano.shared(lasagne.init.Normal(0.1).sample(
(self.dim, self.dim)),
borrow=True)
self.b_mem_upd = theano.shared(lasagne.init.Constant(0.0).sample(
(self.dim, )),
borrow=True)
self.W_mem_hid_in = theano.shared(lasagne.init.Normal(0.1).sample(
(self.dim, self.dim)),
borrow=True)
self.W_mem_hid_hid = theano.shared(lasagne.init.Normal(0.1).sample(
(self.dim, self.dim)),
borrow=True)
self.b_mem_hid = theano.shared(lasagne.init.Constant(0.0).sample(
(self.dim, )),
borrow=True)
self.W_b = theano.shared(lasagne.init.Normal(0.1).sample(
(self.dim, self.dim)),
borrow=True)
self.W_1 = theano.shared(lasagne.init.Normal(0.1).sample(
(self.dim, 10 * self.dim + 3)),
borrow=True)
self.W_2 = theano.shared(lasagne.init.Normal(0.1).sample(
(1, self.dim)),
borrow=True)
self.b_1 = theano.shared(lasagne.init.Constant(0.0).sample(
(self.dim, )),
borrow=True)
self.b_2 = theano.shared(lasagne.init.Constant(0.0).sample((1, )),
borrow=True)
print "==> building episodic memory module (fixed number of steps: %d)" % self.memory_hops
memory = [self.q_q.copy()] # (dim, 4)
for iter in range(1, self.memory_hops + 1):
current_episode = self.new_episode(memory[iter - 1])
memory.append(
self.GRU_update_batch(memory[iter - 1], current_episode,
self.W_mem_res_in, self.W_mem_res_hid,
self.b_mem_res, self.W_mem_upd_in,
self.W_mem_upd_hid, self.b_mem_upd,
self.W_mem_hid_in, self.W_mem_hid_hid,
self.b_mem_hid))
last_mem = memory[-1].flatten()
print "==> building answer module"
self.W_a = theano.shared(lasagne.init.Normal(0.1).sample(
(self.vocab_size, 4 * self.dim)),
borrow=True)
self.prediction = nn_utils.softmax(T.dot(self.W_a, last_mem))
print "==> collecting all parameters"
self.params = [
self.W_inp_res_in, self.W_inp_res_hid, self.b_inp_res,
self.W_inp_upd_in, self.W_inp_upd_hid, self.b_inp_upd,
self.W_inp_hid_in, self.W_inp_hid_hid, self.b_inp_hid,
self.W_mem_res_in, self.W_mem_res_hid, self.b_mem_res,
self.W_mem_upd_in, self.W_mem_upd_hid, self.b_mem_upd,
self.W_mem_hid_in, self.W_mem_hid_hid, self.b_mem_hid, self.W_b,
self.W_1, self.W_2, self.b_1, self.b_2, self.W_a
]
print "==> building loss layer and computing updates"
self.loss_ce = T.nnet.categorical_crossentropy(
self.prediction.dimshuffle('x', 0), T.stack([self.ans_var]))[0]
if self.l2 > 0:
self.loss_l2 = self.l2 * nn_utils.l2_reg(self.params)
else:
self.loss_l2 = 0
self.loss = self.loss_ce + self.loss_l2
updates = lasagne.updates.adadelta(self.loss, self.params)
if self.mode == 'train':
print "==> compiling train_fn"
self.train_fn = theano.function(
inputs=[
self.inp_var, self.q_var, self.ans_var, self.ca_var,
self.cb_var, self.cc_var, self.cd_var, self.input_mask_var
],
outputs=[self.prediction, self.loss],
updates=updates)
print "==> compiling test_fn"
self.test_fn = theano.function(inputs=[
self.inp_var, self.q_var, self.ans_var, self.ca_var, self.cb_var,
self.cc_var, self.cd_var, self.input_mask_var
],
outputs=[
self.prediction, self.loss,
self.inp_c, self.q_q, last_mem
])
if self.mode == 'train':
print "==> computing gradients (for debugging)"
gradient = T.grad(self.loss, self.params)
self.get_gradient_fn = theano.function(inputs=[
self.inp_var, self.q_var, self.ans_var, self.ca_var,
self.cb_var, self.cc_var, self.cd_var, self.input_mask_var
],
outputs=gradient)
