def build_graph(self, x):
conv_W_1 = dy.parameter(self.params['conv_W_1'])
conv_b_1 = dy.parameter(self.params['conv_b_1'])
conv_W_2 = dy.parameter(self.params['conv_W_2'])
conv_b_2 = dy.parameter(self.params['conv_b_2'])
conv_W_3 = dy.parameter(self.params['conv_W_3'])
conv_b_3 = dy.parameter(self.params['conv_b_3'])
W = dy.parameter(self.params['W'])
b = dy.parameter(self.params['b'])
(n, d), _ = x.dim()
x = dy.reshape(x, (1, n, d))
# 一维卷积网络
conv_1 = dy.tanh(
dy.conv2d_bias(x, conv_W_1, conv_b_1, (1, 1), is_valid=False))
conv_2 = dy.tanh(
dy.conv2d_bias(x, conv_W_2, conv_b_2, (1, 1), is_valid=False))
conv_3 = dy.tanh(
dy.conv2d_bias(x, conv_W_3, conv_b_3, (1, 1), is_valid=False))
pool_1 = dy.max_dim(dy.reshape(conv_1, (n, self.options['channel_1'])))
pool_2 = dy.max_dim(dy.reshape(conv_2, (n, self.options['channel_2'])))
pool_3 = dy.max_dim(dy.reshape(conv_3, (n, self.options['channel_3'])))
# 全连接分类
pool = dy.concatenate([pool_1, pool_2, pool_3], 0)
logit = dy.dot_product(pool, W) + b
return logit
def transduce(self, encodings):
inp = encodings
dim = inp.dim()
if dim[0][1] < self.ngram_size:
pad = dy.zeros((self.embed_dim, self.ngram_size-dim[0][1]))
inp = dy.concatenate([inp, pad], d=1)
dim = inp.dim()
inp = dy.reshape(inp, (1, dim[0][1], dim[0][0]))
encodings = dy.rectify(dy.conv2d_bias(inp, dy.parameter(self.filter), dy.parameter(self.bias), stride=(1, 1), is_valid=True))
return dy.max_dim(dy.max_dim(encodings, d=1), d=0)
def transduce(self, src: ExpressionSequence) -> ExpressionSequence:
src = src.as_tensor()
src_height = src.dim()[0][0]
src_width = src.dim()[0][1]
# src_channels = 1
batch_size = src.dim()[1]
# convolution and pooling layers
# src dim is ((40, 1000), 128)
src = padding(src, self.filter_width[0]+3)
l1 = dy.rectify(dy.conv2d(src, dy.parameter(self.filters1), stride = [self.stride[0], self.stride[0]], is_valid = True)) # ((1, 1000, 64), 128)
pool1 = dy.maxpooling2d(l1, (1, 4), (1,2), is_valid = True) #((1, 499, 64), 128)
pool1 = padding(pool1, self.filter_width[1]+3)
l2 = dy.rectify(dy.conv2d(pool1, dy.parameter(self.filters2), stride = [self.stride[1], self.stride[1]], is_valid = True))# ((1, 499, 512), 128)
pool2 = dy.maxpooling2d(l2, (1, 4), (1,2), is_valid = True)#((1, 248, 512), 128)
pool2 = padding(pool2, self.filter_width[2])
l3 = dy.rectify(dy.conv2d(pool2, dy.parameter(self.filters3), stride = [self.stride[2], self.stride[2]], is_valid = True))# ((1, 248, 1024), 128)
pool3 = dy.max_dim(l3, d = 1)
my_norm = dy.l2_norm(pool3) + 1e-6
output = dy.cdiv(pool3,my_norm)
output = dy.reshape(output, (self.num_filters[2],), batch_size = batch_size)
return ExpressionSequence(expr_tensor=output)
def calc_scores(words):
dy.renew_cg()
W_cnn_express = dy.parameter(W_cnn)
b_cnn_express = dy.parameter(b_cnn)
W_sm_express = dy.parameter(W_sm)
b_sm_express = dy.parameter(b_sm)
Waux_sm_express = dy.parameter(Waux_sm)
baux_sm_express = dy.parameter(baux_sm)
# basically, win size tells you how many words/chars/pixels (?) we're 'looking at' at each step.
# Here, 1 unit is 1 word. If a sample has fewer words than win size, then we probably do need some padding.
# Padd with index 0. (so we're treating the pad words as UNK (?))
if len(words) < WIN_SIZE:
words += [0] * (WIN_SIZE-len(words))
# Convolution + pooling layer
cnn_in = dy.concatenate([W_emb[x] for x in words], d=1) # concat repr of all words
cnn_out = dy.conv2d_bias(cnn_in, W_cnn_express, b_cnn_express, stride=(1, 1), is_valid=False)
pool_out = dy.max_dim(cnn_out, d=1) # Is this max pooling?
pool_out = dy.reshape(pool_out, (FILTER_SIZE,))
pool_out = dy.rectify(pool_out) # Is this ReLU activation?
# get scores for either task
scores_main = W_sm_express * pool_out + b_sm_express
scores_aux = Waux_sm_express * pool_out + baux_sm_express
return scores_main, scores_aux
def _build_computation_graph(self, words, train_mode=True):
"""
Builds the computational graph.
"""
dy.renew_cg()
# turn parameters into expressions
softmax_weight_exp = dy.parameter(self.softmax_weight)
softmax_bias_exp = dy.parameter(self.softmax_bias)
word_reps = [self._word_rep(word) for word in words]
embs = dy.concatenate(word_reps, d=1)
if self.pooling_method == "average":
average_emb = dy.mean_dim(embs, d=1)
elif self.pooling_method == "max":
average_emb = dy.max_dim(embs, d=1)
else:
raise NotImplementedError
average_emb = dy.reshape(average_emb, (self.word_embedding_size,))
if self.average_dropout is not None:
dy.dropout(average_emb, p=self.average_dropout)
return softmax_weight_exp * average_emb + softmax_bias_exp
def transduce(self, embeds):
expr_seq = []
seq_len = embeds.dim()[0][1]
for i in range(seq_len):
expr_seq.append(dy.max_dim(dy.select_cols(embeds, [i]), 1))
encodings = self.seq_transducer.transduce(ExpressionSequence(expr_seq))
return self.seq_transducer.get_final_states()[-1].main_expr()
def decode(self, emissions):
"""Viterbi decode to find the best sequence.
:param emissions: List[dy.Expression]
Returns:
List[int], dy.Expression ((1,), B)
"""
if self.add_ends:
emissions = CRF._prep_input(emissions)
backpointers = []
transitions = self.transitions
inits = [-1e4] * self.n_tags
inits[self.start_idx] = 0
alphas = dy.inputVector(inits)
for emission in emissions:
next_vars = dy.colwise_add(dy.transpose(transitions), alphas)
best_tags = np.argmax(next_vars.npvalue(), 0)
v_t = dy.max_dim(next_vars, 0)
alphas = v_t + emission
backpointers.append(best_tags)
terminal_expr = alphas + dy.pick(transitions, self.end_idx)
best_tag = np.argmax(terminal_expr.npvalue())
path_score = dy.pick(terminal_expr, best_tag)
best_path = [best_tag]
for bp_t in reversed(backpointers):
best_tag = bp_t[best_tag]
best_path.append(best_tag)
_ = best_path.pop()
best_path.reverse()
return best_path, path_score
def calculateScores(self, instance, vectors, network, scores, isTraining):
dReprCache = {}
for dId in range(-1, len(instance.sentence)):
depReprs = self.__featReprBuilder.extractAndBuildFeatRepr(
gfeatures.FeatId.DEP, dId, instance.sentence, vectors,
isTraining)
depRepr = dynet.esum(depReprs) if len(depReprs) > 0 else None
dReprCache[dId] = (depRepr, len(depReprs))
for hId in range(-1, len(instance.sentence)):
headReprs = self.__featReprBuilder.extractAndBuildFeatRepr(
gfeatures.FeatId.HEAD, hId, instance.sentence, vectors,
isTraining)
headRepr = dynet.esum(headReprs) if len(headReprs) > 0 else None
for dId in range(-1, len(instance.sentence)):
depRepr, depNr = dReprCache[dId]
distRepr = self.__featReprBuilder.onlyBuildFeatRepr(
gfeatures.FeatId.DIST, (hId, dId), isTraining)
featRepr = [headRepr, depRepr]
featReprNr = len(headReprs) + depNr
if distRepr != None:
featRepr.append(distRepr)
featReprNr += 1
assert featReprNr == self.__featReprBuilder.getNrOfFeatures()
featRepr = dynet.esum([f for f in featRepr if f is not None])
netOut = network.buildOutput(featRepr, isTraining=isTraining)
scores.addOutput(hId, dId, netOut)
scores.addScore(hId, dId, dynet.max_dim(netOut).scalar_value())
def viterbi(emissions, transition, start_idx, end_idx, norm=False):
n_tags = emissions[0].dim()[0][0]
backpointers = []
inits = [-1e4] * n_tags
inits[start_idx] = 0
alphas = dy.inputVector(inits)
alphas = dy.log_softmax(alphas) if norm else alphas
for emission in emissions:
next_vars = dy.colwise_add(dy.transpose(transition), alphas)
best_tags = np.argmax(next_vars.npvalue(), 0)
v_t = dy.max_dim(next_vars, 0)
alphas = v_t + emission
backpointers.append(best_tags)
terminal_expr = alphas + dy.pick(transition, end_idx)
best_tag = np.argmax(terminal_expr.npvalue())
path_score = dy.pick(terminal_expr, best_tag)
best_path = [best_tag]
for bp_t in reversed(backpointers):
best_tag = bp_t[best_tag]
best_path.append(best_tag)
_ = best_path.pop()
best_path.reverse()
return best_path, path_score
def calc_predict_and_activations(wids, tag, words):
dy.renew_cg()
if len(wids) < WIN_SIZE:
wids += [0] * (WIN_SIZE-len(wids))
cnn_in = dy.concatenate([dy.lookup(W_emb, x) for x in wids], d=1)
cnn_out = dy.conv2d_bias(cnn_in, W_cnn, b_cnn, stride=(1, 1), is_valid=False)
filters = (dy.reshape(cnn_out, (len(wids), FILTER_SIZE))).npvalue()
activations = filters.argmax(axis=0)
pool_out = dy.max_dim(cnn_out, d=1)
pool_out = dy.reshape(pool_out, (FILTER_SIZE,))
pool_out = dy.rectify(pool_out)
scores = (W_sm * pool_out + b_sm).npvalue()
print ('%d ||| %s' % (tag, ' '.join(words)))
predict = np.argmax(scores)
print (display_activations(words, activations))
print ('scores=%s, predict: %d' % (scores, predict))
features = pool_out.npvalue()
W = W_sm.npvalue()
bias = b_sm.npvalue()
print (' bias=%s' % bias)
contributions = W * features
print (' very bad (%.4f): %s' % (scores[0], contributions[0]))
print (' bad (%.4f): %s' % (scores[1], contributions[1]))
print (' neutral (%.4f): %s' % (scores[2], contributions[2]))
print (' good (%.4f): %s' % (scores[3], contributions[3]))
print ('very good (%.4f): %s' % (scores[4], contributions[4]))
def calc_predict_and_activations(wids, tag, words):
dy.renew_cg()
if len(wids) < WIN_SIZE:
wids += [0] * (WIN_SIZE - len(wids))
cnn_in = dy.concatenate([dy.lookup(W_emb, x) for x in wids], d=1)
cnn_out = dy.conv2d_bias(cnn_in,
W_cnn,
b_cnn,
stride=(1, 1),
is_valid=False)
filters = (dy.reshape(cnn_out, (len(wids), FILTER_SIZE))).npvalue()
activations = filters.argmax(axis=0)
pool_out = dy.max_dim(cnn_out, d=1)
pool_out = dy.reshape(pool_out, (FILTER_SIZE, ))
pool_out = dy.rectify(pool_out)
scores = (W_sm * pool_out + b_sm).npvalue()
print('%d ||| %s' % (tag, ' '.join(words)))
predict = np.argmax(scores)
print(display_activations(words, activations))
print('scores=%s, predict: %d' % (scores, predict))
features = pool_out.npvalue()
W = W_sm.npvalue()
bias = b_sm.npvalue()
print(' bias=%s' % bias)
contributions = W * features
print(' very bad (%.4f): %s' % (scores[0], contributions[0]))
print(' bad (%.4f): %s' % (scores[1], contributions[1]))
print(' neutral (%.4f): %s' % (scores[2], contributions[2]))
print(' good (%.4f): %s' % (scores[3], contributions[3]))
print('very good (%.4f): %s' % (scores[4], contributions[4]))
def viterbi(emissions, transition, start_idx, end_idx, norm=False):
n_tags = emissions[0].dim()[0][0]
backpointers = []
inits = [-1e4] * n_tags
inits[start_idx] = 0
alphas = dy.inputVector(inits)
alphas = dy.log_softmax(alphas) if norm else alphas
for emission in emissions:
next_vars = dy.colwise_add(dy.transpose(transition), alphas)
best_tags = np.argmax(next_vars.npvalue(), 0)
v_t = dy.max_dim(next_vars, 0)
alphas = v_t + emission
backpointers.append(best_tags)
terminal_expr = alphas + dy.pick(transition, end_idx)
best_tag = np.argmax(terminal_expr.npvalue())
path_score = dy.pick(terminal_expr, best_tag)
best_path = [best_tag]
for bp_t in reversed(backpointers):
best_tag = bp_t[best_tag]
best_path.append(best_tag)
_ = best_path.pop()
best_path.reverse()
return best_path, path_score
def softmax(x):
"""
Compute the softmax function in tensorflow.
You might find the tensorflow functions tf.exp, tf.reduce_max,
tf.reduce_sum, tf.expand_dims useful. (Many solutions are possible, so you may
not need to use all of these functions). Recall also that many common
tensorflow operations are sugared (e.g. x * y does a tensor multiplication
if x and y are both tensors). Make sure to implement the numerical stability
fixes as in the previous homework!
Args:
x: tf.Tensor with shape (n_samples, n_features). Note feature vectors are
represented by row-vectors. (For simplicity, no need to handle 1-d
input as in the previous homework)
Returns:
out: tf.Tensor with shape (n_sample, n_features). You need to construct this
tensor in this problem.
"""
### YOUR CODE HERE
x_max = dy.max_dim(x, 1)
x_sub = dy.colwise_add(x, -x_max)
x_exp = dy.exp(x_sub)
sum_exp = dy.colwise_add(dy.zeroes(x.dim()[0]), dy.sum_cols(x_exp))
out = dy.cdiv(x_exp, sum_exp)
### END YOUR CODE
return out
def compute_loss(model, prev_state, current_state, action, reward, step_num):
q = dy.pick(model.forward(prev_state), action)
v = dy.max_dim(model.forward(current_state))
expval = v * math.pow(GAMMA, step_num) + reward
loss = q - expval
return loss
def exprseq_pooling(self, exprseq):
# Reduce to vector
if exprseq.expr_tensor != None:
if len(exprseq.expr_tensor.dim()[0]) > 1:
return dy.max_dim(exprseq.expr_tensor, d=1)
else:
return exprseq.expr_tensor
else:
return dy.emax(exprseq.expr_list)
def exprseq_pooling(self, exprseq):
# Reduce to vector
exprseq = ExpressionSequence(expr_tensor=exprseq.mask.add_to_tensor_expr(exprseq.as_tensor(),-1e10), mask=exprseq.mask)
if exprseq.expr_tensor != None:
if len(exprseq.expr_tensor.dim()[0]) > 1:
return dy.max_dim(exprseq.expr_tensor, d=1)
else:
return exprseq.expr_tensor
else:
return dy.emax(exprseq.expr_list)
def softmax(x):
### YOUR CODE HERE
x_max = dy.max_dim(x, 1)
x_sub = dy.colwise_add(x, -x_max)
x_exp = dy.exp(x_sub)
x_sum = dy.sum_cols(x_exp)
x_tmp = dy.zeroes(x.dim()[0])
x_tmp = dy.colwise_add(x_tmp, x_sum)
out = dy.cdiv(x_exp, x_tmp)
### END YOUR CODE
return out
def calc_scores(wids):
dy.renew_cg()
if len(wids) < WIN_SIZE:
wids += [0] * (WIN_SIZE-len(wids))
cnn_in = dy.concatenate([dy.lookup(W_emb, x) for x in wids], d=1)
cnn_out = dy.conv2d_bias(cnn_in, W_cnn, b_cnn, stride=(1, 1), is_valid=False)
pool_out = dy.max_dim(cnn_out, d=1)
pool_out = dy.reshape(pool_out, (FILTER_SIZE,))
pool_out = dy.rectify(pool_out)
return W_sm * pool_out + b_sm
def calc_scores(wids):
dy.renew_cg()
if len(wids) < WIN_SIZE:
wids += [0] * (WIN_SIZE-len(wids))
cnn_in = dy.concatenate([dy.lookup(W_emb, x) for x in wids], d=1)
cnn_out = dy.conv2d_bias(cnn_in, W_cnn, b_cnn, stride=(1, 1), is_valid=False)
pool_out = dy.max_dim(cnn_out, d=1)
pool_out = dy.reshape(pool_out, (FILTER_SIZE,))
pool_out = dy.rectify(pool_out)
return W_sm * pool_out + b_sm
def conv(input_):
"""Perform the 1D conv.
:param input: dy.Expression ((1, T, dsz), B)
Returns:
dy.Expression ((cmotsz,), B)
"""
c = dy.conv2d_bias(input_, weight, bias, strides, is_valid=False)
activation = dy.rectify(c)
mot = dy.reshape(dy.max_dim(activation, 1), (cmotsz, ))
return mot
def calc_loss(self, scores, axis, true, importance):
ret = [
i * dy.pickneglogsoftmax(scores, t)
for t, i in zip(true, importance)
]
if self.loss == "max_margin":
ret.append(
dy.max_dim(
dy.log_softmax(scores,
restrict=list(
set(range(self.num_labels[axis])) -
set(true)))))
return ret
def optimize(self, environment, prev_pos, action, next_pos, reward):
# Get Q(s_t, a_t): predictions of action taken in environment at
# previous position
q = dy.pick(self.forward(environment, prev_pos), action)
# V: max of Q at next state
v = dy.max_dim(self.forward(environment, next_pos))
expval = v * GAMMA + reward
loss = q - expval
loss.backward()
self.trainer.update()
def log_sum_exp_dim_0(x):
# numerically stable log_sum_exp
dims = x.dim()
max_score = dy.max_dim(x, 0) # (dim_1, batch_size)
if len(dims[0]) == 1:
max_score_extend = max_score
else:
max_score_reshape = dy.reshape(max_score, (1, dims[0][1]), batch_size=dims[1])
max_score_extend = dy.concatenate([max_score_reshape] * dims[0][0])
x = x - max_score_extend
exp_x = dy.exp(x)
# (dim_1, batch_size), if no dim_1, return ((1,), batch_size)
log_sum_exp_x = dy.log(dy.mean_dim(exp_x, d=[0], b=False) * dims[0][0])
return log_sum_exp_x + max_score
def encode(self, word, training=False):
W_cnn = dy.parameter(self.W_cnn)
b_cnn = dy.parameter(self.b_cnn)
embs = dy.concatenate(
[dy.lookup(self.char_embeds, x) for x in word[:45]], d=1)
if self.dropout > 0 and training:
embs = dy.dropout(embs, self.dropout)
cnn_out = dy.conv2d_bias(
embs, W_cnn, b_cnn, stride=(1, 1),
is_valid=False) # maybe change this? diagram shows padding
max_pool = dy.max_dim(cnn_out, d=1)
rep = dy.reshape(dy.tanh(max_pool), (self.filter_size, ))
return rep
def compose(self, embeds):
if type(embeds) != list:
embeds = [
dy.pick_batch_elem(embeds, i) for i in range(embeds.dim()[1])
]
if len(embeds) < self.ngram_size:
embeds.extend([dy.zeros(self.embed_dim)] *
(self.ngram_size - len(embeds)))
embeds = dy.transpose(
dy.concatenate([dy.concatenate_cols(embeds)], d=2), [2, 1, 0])
embeds = dy.conv2d_bias(embeds, self.filter, self.bias,
(self.embed_dim, 1))
embeds = dy.max_dim(dy.pick(embeds, index=0), d=0)
return self.transform.transform(embeds)
def _build_computation_graph(self, words, train_mode=True):
"""
Builds the computational graph.
"""
dy.renew_cg()
# turn parameters into expressions
softmax_weight_exp = dy.parameter(self.softmax_weight)
softmax_bias_exp = dy.parameter(self.softmax_bias)
# initialize the RNNs
f_init = self.fwd_word_rnn.initial_state()
b_init = self.bwd_word_rnn.initial_state()
# cf_init = self.fwd_char_rnn.initial_state()
# cb_init = self.bwd_char_rnn.initial_state()
# only use word-level for now
word_reps = [self._word_rep(word) for word in words]
if train_mode and self.add_word_noise:
word_reps = [dy.noise(word_rep, 0.05) for word_rep in word_reps]
# feed word vectors into biLSTM
fw_exps = f_init.transduce(word_reps)
bw_exps = b_init.transduce(reversed(word_reps))
if self.pooling_method == "last":
average_lstm = dy.concatenate([fw_exps[-1], bw_exps[-1]])
else:
bi_exps = [
dy.concatenate([f, b])
for f, b in zip(fw_exps, reversed(bw_exps))
]
bi_exps = dy.concatenate(bi_exps, d=1)
if self.pooling_method == "average":
average_lstm = dy.mean_dim(bi_exps, d=1)
elif self.pooling_method == "max":
average_lstm = dy.max_dim(bi_exps, d=1)
else:
raise NotImplementedError
if self.average_dropout is not None:
average_lstm = dy.dropout(average_lstm, p=self.average_dropout)
return softmax_weight_exp * average_lstm + softmax_bias_exp
def _build_tagging_graph(self, words, train_mode=True):
"""
Builds the computational graph.
Model similar to http://aclweb.org/anthology/D/D14/D14-1181.pdf.
"""
dy.renew_cg()
# turn parameters into expressions
mlp_output = dy.parameter(self.pO)
W_cnn_expressions = []
b_cnn_expressions = []
for W_cnn, b_cnn in zip(self.W_cnns, self.b_cnns):
W_cnn_expressions.append(dy.parameter(W_cnn))
b_cnn_expressions.append(dy.parameter(b_cnn))
if len(words) < self._cnn_window_size:
pad_char = "<*>"
words += [pad_char] * (self._cnn_window_size - len(words))
if self._char_level:
cnn_in = dy.concatenate(self._chars_rep(words), d=1)
else:
word_reps = [self._word_rep(word) for word in words]
cnn_in = dy.concatenate(word_reps, d=1)
pools_out = []
for W_cnn_express, b_cnn_express in zip(W_cnn_expressions,
b_cnn_expressions):
cnn_out = dy.conv2d_bias(cnn_in,
W_cnn_express,
b_cnn_express,
stride=(1, 1),
is_valid=False)
# max-pooling
pool_out = dy.max_dim(cnn_out, d=1)
pool_out = dy.reshape(pool_out, (self._cnn_filter_size, ))
pools_out.append(pool_out)
pools_concat = dy.concatenate(pools_out)
return mlp_output * pools_concat
def loss_upper_bound(gold_tags, idx, beam_costs_prev, scores, beam_size):
beam_size_prev, num_tags = scores.dim()[0]
next_beam_size = beam_size if idx < len(gold_tags) - 1 else 1
scores_flat = dy.reshape(scores, (beam_size_prev * num_tags,))
costs_flat = dynet_compute_costs_flat(gold_tags, idx, beam_costs_prev)
sigma_star = np.argsort(costs_flat)
gold_idx = sigma_star[0]
scores_flat_np = scores_flat.npvalue()
sigma_hat = np.argsort(scores_flat_np)[::-1]
scores_delta = scores_flat - scores_flat[gold_idx] + 1.0
costs_delta = costs_flat - costs_flat[gold_idx]
# mask those that are inside the beam.
costs_delta[sigma_star[:next_beam_size]] = 0.0
deltas = dy.cmult(dy.inputTensor(costs_delta), scores_delta)
return dy.max_dim(deltas)
def on_calc_additional_loss(self, *args, **kwargs):
seq_len = len(self.last_output)
loss_expr = 0
for pos_i in range(seq_len):
input_i = self.last_output[pos_i]
affine = self.linear_layer(input_i)
softmax_out = dy.softmax(affine)
if self.mode == "entropy":
loss_expr = loss_expr - dy.sum_dim(
dy.cmult(dy.log(softmax_out), softmax_out), d=[0])
elif self.mode == "max":
loss_expr = loss_expr - dy.log(dy.max_dim(softmax_out))
else:
raise ValueError(f"unknown mode {self.mode}")
# loss_expr = loss_expr * (self.scale / seq_len)
loss_expr = loss_expr * self.scale
return losses.FactoredLossExpr({"enc_entropy": loss_expr})
def __buildErrorOutputs(self, scores, correctTree, predictedTree):
result = [ ]
for tPos in range(correctTree.nrOfTokens()):
corrHead = correctTree.getHead(tPos)
predHead = predictedTree.getHead(tPos)
corrOutputs = scores.getOutput(corrHead, tPos)
predOutputs = scores.getOutput(predHead, tPos)
corrLblId = self.__lblDict.getLblId(correctTree.getLabel(tPos))
predLblId = self.__lblDict.getLblId(predictedTree.getLabel(tPos))
### tree errors
if corrHead != predHead:
result.append((predOutputs[predLblId], dynet.max_dim(corrOutputs)))
### lbl errors
worstLblId = max((scr, lId) for (lId, scr) in enumerate(corrOutputs.value()) if lId != corrLblId)[1]
result.append((corrOutputs[worstLblId], corrOutputs[corrLblId]))
return result
def run_classifier(self, common_top_recur, word_inputs, domain_flag):
batch_size = word_inputs.shape[1]
seq_len = word_inputs.shape[0]
cnn_filter = []
for filt in self.filter:
cnn_filter.append(dy.parameter(filt))
cnn_W = dy.parameter(self.class_W)
cnn_input = dy.reshape(common_top_recur,
(1, seq_len, 2 * self.lstm_hiddens), batch_size)
# print(cnn_input.npvalue().shape)
cnn_out_list = []
for i in range(len(cnn_filter)):
cnn_out = dy.conv2d(cnn_input,
cnn_filter[i], [1, 1],
is_valid=False) # len*batch*filter_num
# print(cnn_out.npvalue().shape)
pool_out = dy.max_dim(cnn_out, d=1)
# print(pool_out.npvalue().shape)
pool_out = dy.reshape(pool_out, (self.filter_size, ), batch_size)
# print(pool_out.npvalue().shape)
pool_out = dy.rectify(pool_out)
cnn_out_list.append(pool_out)
final_out = dy.concatenate(cnn_out_list)
result = cnn_W * final_out
predict = np.argmax(result.npvalue(), axis=0)
# print(predict)
cor = 0.
for pre in predict:
if int(pre) == domain_flag:
cor += 1
class_accurate = cor / batch_size
target = [domain_flag] * batch_size # [0,0,0,0]
# print(result.npvalue().shape, np.array(target).shape)
classes_loss = dy.pickneglogsoftmax_batch(result, target)
class_loss = dy.sum_batches(classes_loss) / batch_size
# print(class_loss.npvalue().shape)
return class_loss, class_accurate
def calc_scores(words):
dy.renew_cg()
W_cnn_express = dy.parameter(W_cnn)
b_cnn_express = dy.parameter(b_cnn)
W_sm_express = dy.parameter(W_sm)
b_sm_express = dy.parameter(b_sm)
# basically, win size tells you how many words/chars/pixels (?) we're 'looking at' at each step.
# Here, 1 unit is 1 word. If a sample has fewer words than win size, then we probably do need some padding.
# Padd with index 0. (so we're treating the pad words as UNK (?))
if len(words) < WIN_SIZE:
words += [0] * (WIN_SIZE - len(words))
cnn_in = dy.concatenate([dy.lookup(W_emb, x) for x in words],
d=1) # concat repr of all words
cnn_out = dy.conv2d_bias(cnn_in,
W_cnn_express,
b_cnn_express,
stride=(1, 1),
is_valid=False)
pool_out = dy.max_dim(cnn_out, d=1)
pool_out = dy.reshape(pool_out, (FILTER_SIZE, ))
pool_out = dy.rectify(pool_out)
return W_sm_express * pool_out + b_sm_express
def calc_loss(self, scores, axis, true, importance):
ret = [i * dy.pickneglogsoftmax(scores, t) for t, i in zip(true, importance)]
if self.loss == "max_margin":
ret.append(dy.max_dim(dy.log_softmax(scores, restrict=list(set(range(self.num_labels[axis])) - set(true)))))
return ret
def attend(self, context, x):
context_cols = dy.concatenate_cols(context)
context_emb = dy.max_dim(context_cols, 1)
return context_emb, None