def forward(self, source, memory_bank, memory_lengths=None,
memory_turns = None, coverage=None):
# here we implement a hierarchical attention
if source.dim() == 2:
source = source.unsqueeze(1)
batch, source_tl, source_wl, dim = memory_bank.size()
batch_, target_l, dim_ = source.size()
aeq(batch, batch_)
# word level attention
word_align = self.word_score(source, memory_bank.contiguous()
.view(batch, -1, dim))
# transform align (b, 1, tl * wl) -> (b * tl, 1, wl)
word_align = word_align.view(batch * source_tl, 1, source_wl)
if memory_lengths is not None:
word_mask = sequence_mask_herd(memory_lengths.view(-1), max_len=word_align.size(-1))
word_mask = word_mask.unsqueeze(1) # Make it broadcastable.
word_align.masked_fill_(1 - word_mask, -float('inf'))
# Softmax or sparsemax to normalize attention weights
if self.attn_func == "softmax":
word_align_vectors = F.softmax(word_align.view(batch * source_tl, source_wl), -1)
else:
word_align_vectors = sparsemax(word_align.view(batch * source_tl, source_wl), -1)
# mask the all padded sentences
sent_pad_mask = memory_lengths.view(-1).eq(0).unsqueeze(1)
word_align_vectors = torch.mul(word_align_vectors,
(1.0 - sent_pad_mask).type_as(word_align_vectors))
word_align_vectors = word_align_vectors.view(batch * source_tl, target_l, source_wl)
# each context vector c_t is the weighted average
# over all the source hidden states
cw = torch.bmm(word_align_vectors, memory_bank.view(batch * source_tl, source_wl, -1))
cw = cw.view(batch, source_tl, -1)
# concat_cw = torch.cat([cw, source.repeat(1, source_tl, 1)], 2).view(batch*source_tl, -1)
# attn_hw = self.word_linear_out(concat_cw).view(batch, source_tl, -1)
# attn_hw = torch.tanh(attn_hw)
# turn level attention
turn_align = self.turn_score(source, cw)
if memory_turns is not None:
turn_mask = sequence_mask(memory_turns, max_len=turn_align.size(-1))
turn_mask = turn_mask.unsqueeze(1) # Make it broadcastable.
turn_align.masked_fill_(1 - turn_mask, -float('inf'))
# Softmax or sparsemax to normalize attention weights
if self.attn_func == "softmax":
turn_align_vectors = F.softmax(turn_align.view(batch * target_l, source_tl), -1)
else:
turn_align_vectors = sparsemax(turn_align.view(batch * target_l, source_tl), -1)
turn_align_vectors = turn_align_vectors.view(batch, target_l, source_tl)
# each context vector c_t is the weighted average
# over all the source hidden states
ct = torch.bmm(turn_align_vectors, cw)
return ct.squeeze(1), None
def forward(self, source, memory_bank, memory_lengths=None, coverage=None):
# here we do not need to calculate the align
# because the answer vector is already averaged representations
if source.dim() == 2:
source = source.unsqueeze(1)
batch, source_l, dim = memory_bank.size()
batch_, target_l, dim_ = source.size()
aeq(batch, batch_)
# compute attention scores, as in Luong et al.
align = self.score(source, memory_bank)
if memory_lengths is not None:
mask = sequence_mask(memory_lengths, max_len=align.size(-1))
mask = mask.unsqueeze(1) # Make it broadcastable.
align.masked_fill_(1 - mask, -float('inf'))
# Softmax or sparsemax to normalize attention weights
if self.attn_func == "softmax":
align_vectors = F.softmax(align.view(batch * target_l, source_l), -1)
else:
align_vectors = sparsemax(align.view(batch * target_l, source_l), -1)
align_vectors = align_vectors.view(batch, target_l, source_l)
# each context vector c_t is the weighted average
# over all the source hidden states
c = torch.bmm(align_vectors, memory_bank)
return c.squeeze(1), align_vectors
def forward(self, memory_bank, memory_lengths=None, coverage=None):
"""
Args:
source (FloatTensor): query vectors ``(batch, tgt_len, dim)``
memory_bank (FloatTensor): source vectors ``(batch, src_len, dim)``
memory_lengths (LongTensor): the source context lengths ``(batch,)``
coverage (FloatTensor): None (not supported yet)
Returns:
(FloatTensor, FloatTensor):
* Computed vector ``(tgt_len, batch, dim)``
* Attention distribtutions for each query
``(tgt_len, batch, src_len)``
"""
batch, source_l, dim = memory_bank.size()
source = self.source
source = source.expand(batch, -1)
source = source.unsqueeze(1)
batch_, target_l, dim_ = source.size()
aeq(batch, batch_)
aeq(dim, dim_)
aeq(self.dim, dim)
if coverage is not None:
batch_, source_l_ = coverage.size()
aeq(batch, batch_)
aeq(source_l, source_l_)
if coverage is not None:
cover = coverage.view(-1).unsqueeze(1)
memory_bank += self.linear_cover(cover).view_as(memory_bank)
memory_bank = torch.tanh(memory_bank)
# compute attention scores, as in Luong et al.
align = self.score(source, memory_bank)
if memory_lengths is not None:
mask = sequence_mask(memory_lengths, max_len=align.size(-1))
mask = mask.unsqueeze(1) # Make it broadcastable.
align.masked_fill_(~mask, -float('inf'))
# Softmax or sparsemax to normalize attention weights
if self.attn_func == "softmax":
align_vectors = F.softmax(align.view(batch*target_l, source_l), -1)
else:
align_vectors = sparsemax(align.view(batch*target_l, source_l), -1)
align_vectors = align_vectors.view(batch, target_l, source_l)
# each context vector c_t is the weighted average
# over all the source hidden states
c = torch.bmm(align_vectors, memory_bank) # batch, target_l, dim
c = c.mean(dim=1) # batch, dim
# Check output sizes
batch_, dim_ = c.size()
aeq(batch, batch_)
aeq(dim, dim_)
return c
def forward(self, source, memory_bank, memory_lengths=None, coverage=None):
"""
Args:
source (`FloatTensor`): query vectors `[batch x tgt_len x dim]`
memory_bank (`FloatTensor`): source vectors `[batch x src_len x dim]`
memory_lengths (`LongTensor`): the source context lengths `[batch]`
coverage (`FloatTensor`): None (not supported yet)
Returns:
(`FloatTensor`, `FloatTensor`):
* Computed vector `[tgt_len x batch x dim]`
* Attention distribtutions for each query
`[tgt_len x batch x src_len]`
"""
if source.dim() == 2:
source = source.unsqueeze(1)
batch, source_l, dim = memory_bank.size()
batch_, target_l, dim_ = source.size()
aeq(batch, batch_)
# compute attention scores, as in Luong et al.
align = self.score(source, memory_bank)
if memory_lengths is not None:
mask = sequence_mask(memory_lengths, max_len=align.size(-1))
mask = mask.unsqueeze(1) # Make it broadcastable.
align.masked_fill_(1 - mask, -float('inf'))
# Softmax or sparsemax to normalize attention weights
if self.attn_func == "softmax":
align_vectors = F.softmax(align.view(batch * target_l, source_l), -1)
else:
align_vectors = sparsemax(align.view(batch * target_l, source_l), -1)
align_vectors = align_vectors.view(batch, target_l, source_l)
# each context vector c_t is the weighted average
# over all the source hidden states
c = torch.bmm(align_vectors, memory_bank)
# concatenate
concat_c = torch.cat([c, source], 2).view(batch * target_l,
self.indim + self.outdim)
attn_h = self.linear_out(concat_c).view(batch, target_l, self.outdim)
return attn_h.squeeze(1), align_vectors.squeeze(1)
def forward(cls, ctx, input, target):
"""
input (FloatTensor): n x num_classes
target (LongTensor): n, the indices of the target classes
"""
assert_equal(input.shape[0], target.shape[0])
p_star = sparsemax(input, 1)
cls.p_star = p_star.clone().detach()
loss = _omega_sparsemax(p_star)
p_star.scatter_add_(1, target.unsqueeze(1),
torch.full_like(p_star, -1))
loss += torch.einsum("ij,ij->i", p_star, input)
ctx.save_for_backward(p_star)
return loss
def attn_map(self, Z):
if self.attn_func == "softmax":
return F.softmax(Z, -1)
elif self.attn_func == "esoftmax":
return esoftmax(Z, -1)
elif self.attn_func == "sparsemax":
return sparsemax(Z, -1)
elif self.attn_func == "tsallis15":
return tsallis15(Z, -1)
elif self.attn_func == "tsallis":
if self.attn_alpha == 2: # slightly faster specialized impl
return sparsemax_bisect(Z, self.bisect_iter)
else:
return tsallis_bisect(Z, self.attn_alpha, self.bisect_iter)
raise ValueError("invalid combination of arguments")
def forward(self,
source,
memory_bank,
memory_lengths=None,
coverage=None,
sent_align_vectors=None,
sent_nums=None):
"""
Only one-step attention is supported now.
Args:
source (`FloatTensor`): query vectors `[batch x dim]`
memory_bank (`FloatTensor`): word_memory_bank is `FloatTensor` with shape `[batch x s_num x s_len x dim]`
sent_lens (`LongTensor`): for word_memory_bank, `[batch x s_num]`
coverage (`FloatTensor`): None (not supported yet)
sent_align_vectors (`FloatTensor`): the computed sentence align distribution, `[batch x s_num]`
sent_nums (`LongTensor`): the sentence numbers of inputs, `[batch]`
use_tanh (`bool`): True, whether use tanh activation function for `general` and 'dot' attention
Returns:
(`FloatTensor`, `FloatTensor`):
* Computed word attentional vector `[batch x dim]`
* Word Attention distribtutions for the query of word `[batch x s_num x s_len]`
"""
# only one step input is supported
assert source.dim(
) == 2, "Only one step input is supported for current attention."
one_step = True
# [batch, 1, dim]
source = source.unsqueeze(1)
batch, tgt_l, dim = source.size()
# check the specification for word level attention
assert sent_align_vectors is not None, "For word level attention, the 'sent_align' must be specified."
assert sent_nums is not None, "For word level attention, the 'sent_nums' must be specified."
assert memory_lengths is not None, "The lengths for the word memory bank are required."
sent_lens = memory_lengths
batch_1, s_num, s_len, dim_ = memory_bank.size()
batch_2, s_num_ = sent_align_vectors.size()
batch_3 = sent_nums.size(0)
aeq(batch, batch_1, batch_2, batch_3)
aeq(dim, dim_, self.dim)
aeq(s_num, s_num_)
# if coverage is not None:
# batch_, source_l_ = coverage.size()
# aeq(batch, batch_)
# aeq(source_l, source_l_)
#
# if coverage is not None:
# cover = coverage.view(-1).unsqueeze(1)
# memory_bank += self.linear_cover(cover).view_as(memory_bank)
# memory_bank = torch.tanh(memory_bank)
# compute word attention scores, as in Luong et al.
# [batch, s_num, s_len, dim] -> [batch, s_num * s_len, dim]
memory_bank = memory_bank.view(batch, s_num * s_len, dim)
# [batch, 1, s_num * s_len]
word_align = self.score(source, memory_bank)
# [batch, s_num * s_len]
word_align = word_align.squeeze(1)
# [batch, s_num, s_len]
word_align = word_align.view(batch, s_num, s_len)
# remove the empty sentences
# [s_toal, s_len], [s_total]
valid_word_align, valid_sent_lens = valid_src_compress(
word_align, sent_nums=sent_nums, sent_lens=sent_lens)
# [s_toal, s_len]
word_mask = sequence_mask(valid_sent_lens,
max_len=valid_word_align.size(-1))
# word_mask = word_mask.view(batch, s_num, s_len)
# # [batch, s_num]
# sent_mask = sequence_mask(sent_nums, max_len=s_num)
# # [batch, s_num, 1]
# sent_mask = sent_mask.unsqueeze(2)
# # [batch, s_num, s_len]
# align_vectors.masked_fill_(1 - sent_mask, 0.0)
# [s_total, s_len]
valid_word_align.masked_fill_(1 - word_mask, -float('inf'))
# Softmax or sparsemax to normalize attention weights
if self.attn_func == "softmax":
align_vectors = F.softmax(valid_word_align, -1)
else:
align_vectors = sparsemax(valid_word_align, -1)
# Recover the original shape by pad 0.s for empty sentence
# [batch, s_num, s_len]
align_vectors = recover_src(align_vectors, sent_nums)
# # For the whole invalid sentence, we set all the word aligns to 0s.
# # Since
# # [batch, s_num]
# sent_mask = sequence_mask(sent_nums, max_len=s_num)
# # [batch, s_num, 1]
# sent_mask = sent_mask.unsqueeze(2)
# # [batch, s_num, s_len]
# align_vectors.masked_fill_(1 - sent_mask, 0.0)
# [batch, s_num, 1]
sent_align_vectors = sent_align_vectors.unsqueeze(-1)
# [batch, s_num, s_len]
align_vectors = align_vectors * sent_align_vectors
# each context vector c_t is the weighted average
# over all the source hidden states
# [batch, 1, s_num * s_len]
align_vectors = align_vectors.view(batch, -1).unsqueeze(1)
# [batch, 1, s_num * s_len] x [batch, s_num * s_len, dim] -> [batch, 1, dim]
c = torch.bmm(align_vectors, memory_bank)
# [batch, dim]
c = c.squeeze(1)
returned_vec = c
# If output_attn_h == False, we put linear out layer into decoder part
if self.output_attn_h:
# concatenate
# [batch, dim]
source = source.squeeze(1)
# [batch, 2*dim]
concat_c = torch.cat([c, source], 1)
# [batch, dim]
attn_h = self.linear_out(concat_c)
if self.attn_type in ["general", "dot"]:
attn_h = torch.tanh(attn_h)
returned_vec = attn_h
align_vectors = align_vectors.squeeze(1).view(batch, s_num, s_len)
# Check output sizes
batch_, dim_ = returned_vec.size()
aeq(batch, batch_)
aeq(dim, dim_)
# check
batch_, s_num_, s_len_ = align_vectors.size()
aeq(batch, batch_)
aeq(s_num, s_num_)
return returned_vec, align_vectors
def forward(self, source, memory_bank, memory_lengths=None):
"""
Args:
source (`FloatTensor`): query vectors `[batch x tgt_len x tgt_enc_dim]`
memory_bank (`FloatTensor`): source vectors `[batch x src_len x src_enc_dim]`
memory_lengths (`LongTensor`): the source context lengths `[batch]`
Returns:
(`FloatTensor`):
* Attention distribtutions for each query
`[batch x tgt_len x src_len]`
"""
# one step input
if source.dim() == 2:
one_step = True
source = source.unsqueeze(1)
else:
one_step = False
batch, source_l, src_enc_dim = memory_bank.size()
batch_, target_l, tgt_enc_dim = source.size()
aeq(batch, batch_)
aeq(self.src_enc_dim, src_enc_dim)
aeq(self.tgt_enc_dim, tgt_enc_dim)
# compute attention scores, as in Luong et al.
# (batch, t_len, s_len)
align = self.score(source, memory_bank)
if memory_lengths is not None:
mask = sequence_mask(memory_lengths, max_len=align.size(-1))
mask = mask.unsqueeze(1) # Make it broadcastable.
align.masked_fill_(1 - mask, -float('inf'))
# Softmax or sparsemax to normalize attention weights
if self.attn_func == "softmax":
align_vectors = F.softmax(align.view(batch * target_l, source_l),
-1)
else:
align_vectors = sparsemax(align.view(batch * target_l, source_l),
-1)
align_vectors = align_vectors.view(batch, target_l, source_l)
# # each context vector c_t is the weighted average
# # over all the source hidden states
# c = torch.bmm(align_vectors, memory_bank)
#
# # concatenate
# concat_c = torch.cat([c, source], 2).view(batch*target_l, dim*2)
# attn_h = self.linear_out(concat_c).view(batch, target_l, dim)
# if self.attn_type in ["general", "dot"]:
# attn_h = torch.tanh(attn_h)
if one_step:
# attn_h = attn_h.squeeze(1)
align_vectors = align_vectors.squeeze(1)
# Check output sizes
# batch_, dim_ = attn_h.size()
aeq(batch, batch_)
# aeq(dim, dim_)
batch_, source_l_ = align_vectors.size()
aeq(batch, batch_)
aeq(source_l, source_l_)
else:
# attn_h = attn_h.transpose(0, 1).contiguous()
align_vectors = align_vectors.contiguous()
# Check output sizes
# target_l_, batch_, dim_ = attn_h.size()
# aeq(target_l, target_l_)
aeq(batch, batch_)
# aeq(dim, dim_)
batch_, target_l_, source_l_ = align_vectors.size()
aeq(target_l, target_l_)
aeq(batch, batch_)
aeq(source_l, source_l_)
return align_vectors
def forward(self, source, memory_bank, memory_lengths=None, coverage=None):
"""
Args:
source (`FloatTensor`): query vectors `[batch x tgt_len x dim]` rnn output
memory_bank (`FloatTensor`): source vectors `[batch x src_len x dim]` encoder out
memory_lengths (`LongTensor`): the source context lengths `[batch]` encoder out length
coverage (`FloatTensor`): None (not supported yet)
Returns:
(`FloatTensor`, `FloatTensor`):
* Computed vector `[tgt_len x batch x dim]`
* Attention distribtutions for each query
`[tgt_len x batch x src_len]`
"""
# one step input
if source.dim() == 2:
one_step = True
source = source.unsqueeze(1)
else:
one_step = False
batch, source_l, dim = memory_bank.size()
batch_, target_l, dim_ = source.size()
aeq(batch, batch_)
aeq(dim, dim_)
aeq(self.dim, dim)
if coverage is not None:
batch_, source_l_ = coverage.size()
aeq(batch, batch_)
aeq(source_l, source_l_)
if coverage is not None:
cover = coverage.view(-1).unsqueeze(1) # attn 이랑 share하면 이까지 안들어감.
memory_bank += self.linear_cover(cover).view_as(memory_bank)
memory_bank = torch.tanh(memory_bank)
# compute attention scores, as in Luong et al.
align = self.score(source, memory_bank)
if memory_lengths is not None:
mask = sequence_mask(memory_lengths, max_len=align.size(-1))
mask = mask.unsqueeze(1) # Make it broadcastable.
align.masked_fill_(1 - mask, -float('inf'))
# Softmax or sparsemax to normalize attention weights
if self.attn_func == "softmax":
align_vectors = F.softmax(align.view(batch * target_l, source_l),
-1)
else:
align_vectors = sparsemax(align.view(batch * target_l, source_l),
-1)
align_vectors = align_vectors.view(batch, target_l, source_l)
# each context vector c_t is the weighted average
# over all the source hidden states
c = torch.bmm(align_vectors, memory_bank)
# concatenate
concat_c = torch.cat([c, source], 2).view(batch * target_l, dim * 2)
attn_h = self.linear_out(concat_c).view(batch, target_l, dim)
if self.attn_type in ["general", "dot"]:
attn_h = torch.tanh(attn_h)
if one_step:
attn_h = attn_h.squeeze(1)
align_vectors = align_vectors.squeeze(1)
# Check output sizes
batch_, dim_ = attn_h.size()
aeq(batch, batch_)
aeq(dim, dim_)
batch_, source_l_ = align_vectors.size()
aeq(batch, batch_)
aeq(source_l, source_l_)
else:
attn_h = attn_h.transpose(0, 1).contiguous()
align_vectors = align_vectors.transpose(0, 1).contiguous()
# Check output sizes
target_l_, batch_, dim_ = attn_h.size()
aeq(target_l, target_l_)
aeq(batch, batch_)
aeq(dim, dim_)
target_l_, batch_, source_l_ = align_vectors.size()
aeq(target_l, target_l_)
aeq(batch, batch_)
aeq(source_l, source_l_)
return attn_h, align_vectors
def forward(self, source, memory_bank, memory_lengths=None, coverage=None):
"""
Args:
source (FloatTensor): query vectors ``(batch, tgt_len, dim)``
memory_bank (FloatTensor): source vectors ``(batch, src_len, dim)``
memory_lengths (LongTensor): the source context lengths ``(batch,)``
coverage (FloatTensor): None (not supported yet)
Returns:
(FloatTensor, FloatTensor):
* Computed vector ``(tgt_len, batch, dim)``
* Attention distribtutions for each query
``(tgt_len, batch, src_len)``
"""
# one step input
if source.dim() == 2:
one_step = True
source = source.unsqueeze(1)
else:
one_step = False
batch, source_l, dim = memory_bank.size()
batch_, target_l, dim_ = source.size()
aeq(batch, batch_)
aeq(dim, dim_)
aeq(self.dim, dim)
if coverage is not None:
batch_, source_l_ = coverage.size()
aeq(batch, batch_)
aeq(source_l, source_l_)
if coverage is not None:
cover = coverage.view(-1).unsqueeze(1)
memory_bank += self.linear_cover(cover).view_as(memory_bank)
memory_bank = torch.tanh(memory_bank)
# compute attention scores, as in Luong et al.
# print('source', source.size())
# print('memory_bank', memory_bank.size())
align = self.score(source, memory_bank) # 对应公式 计算attention权重公式
# print('align', align.size()) # align torch.Size([bz, 1, WxH])
if memory_lengths is not None:
mask = sequence_mask(memory_lengths, max_len=align.size(-1))
mask = mask.unsqueeze(1) # Make it broadcastable.
align.masked_fill_(~mask, -float('inf'))
# Softmax or sparsemax to normalize attention weights
if self.attn_func == "softmax":
align_vectors = F.softmax(align.view(batch*target_l, source_l), -1)
else:
align_vectors = sparsemax(align.view(batch*target_l, source_l), -1)
align_vectors = align_vectors.view(batch, target_l, source_l)
# each context vector c_t is the weighted average
# over all the source hidden states
c = torch.bmm(align_vectors, memory_bank)
# c （5, 1, 512）
# concatenate
concat_c = torch.cat([c, source], 2).view(batch*target_l, dim*2) #ot = tanh(Wc[ht; ct])
attn_h = self.linear_out(concat_c).view(batch, target_l, dim)
if self.attn_type in ["general", "dot"]:
attn_h = torch.tanh(attn_h)
if one_step:
attn_h = attn_h.squeeze(1)
align_vectors = align_vectors.squeeze(1)
# Check output sizes
batch_, dim_ = attn_h.size()
aeq(batch, batch_)
aeq(dim, dim_)
batch_, source_l_ = align_vectors.size()
aeq(batch, batch_)
aeq(source_l, source_l_)
else:
attn_h = attn_h.transpose(0, 1).contiguous()
align_vectors = align_vectors.transpose(0, 1).contiguous()
# Check output sizes
target_l_, batch_, dim_ = attn_h.size()
aeq(target_l, target_l_)
aeq(batch, batch_)
aeq(dim, dim_)
target_l_, batch_, source_l_ = align_vectors.size()
aeq(target_l, target_l_)
aeq(batch, batch_)
aeq(source_l, source_l_)
return attn_h, align_vectors
def forward(self, source, memory_bank, memory_lengths=None, coverage=None):
"""
Args:
source (FloatTensor): query vectors ``(batch, tgt_len, dim)``
memory_bank (FloatTensor): source vectors ``(batch, src_len, dim)``
memory_lengths (LongTensor): the source context lengths ``(batch,)``
coverage (FloatTensor): None (not supported yet)
Returns:
(FloatTensor, FloatTensor):
* Computed vector ``(tgt_len, batch, dim)``
* Attention distribtutions for each query
``(tgt_len, batch, src_len)``
"""
# one step input
if source.dim() == 2:
one_step = True
source = source.unsqueeze(1)
else:
one_step = False
batch, source_l, dim = memory_bank.size()
batch_, target_l, dim_ = source.size()
aeq(batch, batch_)
aeq(dim, dim_)
aeq(self.dim, dim)
if coverage is not None:
batch_, source_l_ = coverage.size()
aeq(batch, batch_)
aeq(source_l, source_l_)
if coverage is not None:
cover = coverage.view(-1).unsqueeze(1)
memory_bank += self.linear_cover(cover).view_as(memory_bank)
memory_bank = torch.tanh(memory_bank)
# compute attention scores, as in Luong et al.
align = self.score(source, memory_bank)
if memory_lengths is not None:
mask = sequence_mask(memory_lengths, max_len=align.size(-1))
mask = mask.unsqueeze(1) # Make it broadcastable.
align.masked_fill_(~mask, -float('inf'))
# Softmax or sparsemax to normalize attention weights
if self.attn_func == "softmax":
align_vectors = torch.log_softmax(
align.view(batch * target_l, source_l), -1)
else:
align_vectors = sparsemax(align.view(batch * target_l, source_l),
-1)
align_vectors = align_vectors.view(batch, target_l, source_l)
if one_step:
align_vectors = align_vectors.squeeze(1)
# Check output sizes
batch_, source_l_ = align_vectors.size()
aeq(batch, batch_)
aeq(source_l, source_l_)
else:
align_vectors = align_vectors.transpose(0, 1).contiguous()
# Check output sizes
target_l_, batch_, source_l_ = align_vectors.size()
aeq(target_l, target_l_)
aeq(batch, batch_)
aeq(source_l, source_l_)
return align_vectors
def forward(self, source, memory_bank, memory_lengths=None, coverage=None):
"""
Args:
source (FloatTensor): query vectors ``(batch, tgt_len, dim)``
memory_bank (FloatTensor): source vectors ``(batch, src_len, dim)``
memory_lengths (LongTensor): the source context lengths ``(batch,)``
coverage (FloatTensor): None (not supported yet)
Returns:
(FloatTensor, FloatTensor):
* Computed vector ``(tgt_len, batch, dim)``
* Attention distribtutions for each query
``(tgt_len, batch, src_len)``
"""
# one step input
if source.dim() == 2:
one_step = True
source = source.unsqueeze(1)
else:
one_step = False
batch, source_l, dim = memory_bank.size()
batch_, target_l, dim_ = source.size()
aeq(batch, batch_)
aeq(dim, dim_)
aeq(self.dim, dim)
if coverage is not None:
batch_, source_l_ = coverage.size()
aeq(batch, batch_)
aeq(source_l, source_l_)
if coverage is not None:
cover = coverage.view(-1).unsqueeze(1)
memory_bank += self.linear_cover(cover).view_as(memory_bank)
memory_bank = torch.tanh(memory_bank)
# compute attention scores, as in Luong et al.
align = self.score(source, memory_bank)
if memory_lengths is not None:
mask = sequence_mask(memory_lengths, max_len=align.size(-1))
mask = mask.unsqueeze(1) # Make it broadcastable.
align.masked_fill_(1 - mask, -float('inf'))
# Softmax or sparsemax to normalize attention weights
if self.attn_func == "softmax":
align_vectors = F.softmax(align.view(batch*target_l, source_l), -1)
else:
align_vectors = sparsemax(align.view(batch*target_l, source_l), -1)
align_vectors = align_vectors.view(batch, target_l, source_l)
# each context vector c_t is the weighted average
# over all the source hidden states
c = torch.bmm(align_vectors, memory_bank)
# concatenate
concat_c = torch.cat([c, source], 2).view(batch*target_l, dim*2)
attn_h = self.linear_out(concat_c).view(batch, target_l, dim)
if self.attn_type in ["general", "dot"]:
attn_h = torch.tanh(attn_h)
if one_step:
attn_h = attn_h.squeeze(1)
align_vectors = align_vectors.squeeze(1)
# Check output sizes
batch_, dim_ = attn_h.size()
aeq(batch, batch_)
aeq(dim, dim_)
batch_, source_l_ = align_vectors.size()
aeq(batch, batch_)
aeq(source_l, source_l_)
else:
attn_h = attn_h.transpose(0, 1).contiguous()
align_vectors = align_vectors.transpose(0, 1).contiguous()
# Check output sizes
target_l_, batch_, dim_ = attn_h.size()
aeq(target_l, target_l_)
aeq(batch, batch_)
aeq(dim, dim_)
target_l_, batch_, source_l_ = align_vectors.size()
aeq(target_l, target_l_)
aeq(batch, batch_)
aeq(source_l, source_l_)
return attn_h, align_vectors
def forward(self, source, memory_bank,memory_lengths=None, coverage=None):
"""
Args:
source (`FloatTensor`): query vectors `[batch x tgt_len x dim]`
memory_bank (`FloatTensor`): source vectors `[batch x src_len x dim]`
memory_lengths (`LongTensor`): the source context lengths `[batch]`
coverage (`FloatTensor`): None (not supported yet)
Returns:
(`FloatTensor`, `FloatTensor`):
* Computed vector `[tgt_len x batch x dim]`
* Attention distribtutions for each query
`[tgt_len x batch x src_len]`
"""
# print ('Source..',source.size())
# print ('memory_bank..',memory_bank.size())
# Source..torch.Size([16, 512])
# memory_bank..torch.Size([16, 400, 512])
# one step input
if source.dim() == 2:
one_step = True
source = source.unsqueeze(1)
else:
one_step = False
batch, source_l, dim = memory_bank.size()
batch_, target_l, dim_ = source.size()
aeq(batch, batch_)
aeq(dim, dim_)
aeq(self.dim, dim)
if coverage is not None:
batch_, source_l_ = coverage.size()
aeq(batch, batch_)
aeq(source_l, source_l_)
if coverage is not None:
cover = coverage.view(-1).unsqueeze(1)
memory_bank += self.linear_cover(cover).view_as(memory_bank)
memory_bank = torch.tanh(memory_bank)
# compute attention scores, as in Luong et al.
align = self.score(source, memory_bank)
if memory_lengths is not None:
#????
mask = sequence_mask(memory_lengths, max_len=align.size(-1))
mask = mask.unsqueeze(1) # Make it broadcastable.
# fix for tensor version > 1.2
# refer to https://github.com/OpenNMT/OpenNMT-py/pull/1527/commits/234f9a5f6fca989fe6804e44ea68b58786ed58b8
align.masked_fill_(~mask, -float('inf'))
# Softmax or sparsemax to normalize attention weights
if self.attn_func == "softmax":
align_vectors = F.softmax(align.view(batch*target_l, source_l), -1)
else:
align_vectors = sparsemax(align.view(batch*target_l, source_l), -1)
align_vectors = align_vectors.view(batch, target_l, source_l)
# each context vector c_t is the weighted average
# over all the source hidden states
c = torch.bmm(align_vectors, memory_bank)
# concatenate
concat_c = torch.cat([c, source], 2).view(batch*target_l, dim*2)
attn_h = self.linear_out(concat_c).view(batch, target_l, dim)
if self.attn_type in ["general", "dot"]:
attn_h = torch.tanh(attn_h)
if one_step:
attn_h = attn_h.squeeze(1)
align_vectors = align_vectors.squeeze(1)
# Check output sizes
batch_, dim_ = attn_h.size()
aeq(batch, batch_)
aeq(dim, dim_)
batch_, source_l_ = align_vectors.size()
aeq(batch, batch_)
aeq(source_l, source_l_)
else:
attn_h = attn_h.transpose(0, 1).contiguous()
align_vectors = align_vectors.transpose(0, 1).contiguous()
# Check output sizes
target_l_, batch_, dim_ = attn_h.size()
aeq(target_l, target_l_)
aeq(batch, batch_)
aeq(dim, dim_)
target_l_, batch_, source_l_ = align_vectors.size()
aeq(target_l, target_l_)
aeq(batch, batch_)
aeq(source_l, source_l_)
# print ('Atten Hidden...',attn_h.size()) # torch.Size([16, 512])
# print ('Align...',align_vectors.size()) # torch.Size([16, 400])
return attn_h, align_vectors
def forward(self, source, memory_bank, memory_lengths=None, coverage=None):
# BxT'xd BxTxd B
"""
Args:
source (`FloatTensor`): query vectors `[batch x tgt_len x dim]`
memory_bank (`FloatTensor`): source vectors `[batch x src_len x dim]`
memory_lengths (`LongTensor`): the source context lengths `[batch]`
coverage (`FloatTensor`): None (not supported yet)
Returns:
(`FloatTensor`, `FloatTensor`):
* Computed vector `[tgt_len x batch x dim]`
* Attention distribtutions for each query
`[tgt_len x batch x src_len]`
"""
# one step input
if source.dim() == 2:
one_step = True
source = source.unsqueeze(1)
else:
one_step = False
batch, source_l, dim = memory_bank.size()
batch_, target_l, dim_ = source.size()
aeq(batch, batch_)
aeq(dim, dim_)
aeq(self.dim, dim)
if coverage is not None:
batch_, source_l_ = coverage.size()
aeq(batch, batch_)
aeq(source_l, source_l_)
if coverage is not None:
cover = coverage.view(-1).unsqueeze(1)
memory_bank += self.linear_cover(cover).view_as(memory_bank)
memory_bank = torch.tanh(memory_bank)
# compute attention scores, as in Luong et al.
align = self.score(source, memory_bank)
# (B x T' x T)
# align[b,t',t] = score(w_t, w_t') in batch b
if memory_lengths is not None:
mask = sequence_mask(memory_lengths, max_len=align.size(-1))
# {0,1}^{B x T}
mask = mask.unsqueeze(
1) # Make it broadcastable: {0,1}^{B x 1 x T}
align.masked_fill_(1 - mask, -float('inf'))
# align[b,t',t] = -inf if t > len(b)
# Softmax or sparsemax to normalize attention weights
if self.attn_func == "softmax":
# (BT' x T): apply softmax on each column
align_vectors = F.softmax(align.view(batch * target_l, source_l),
-1)
else:
align_vectors = sparsemax(align.view(batch * target_l, source_l),
-1)
align_vectors = align_vectors.view(batch, target_l, source_l)
# B x T' x T: [b,t',:] is a distrib like [0.02, 0.02, ..., 0.0, 0.0]
# each context vector c_t is the weighted average
# over all the source hidden states
#
# (B x T' x T) (B x T x d) ---------> (B x T' x d)
c = torch.bmm(align_vectors, memory_bank)
# c[b,t',:] = context vector for w_t' in batch b
# context + query
concat_c = torch.cat([c, source], 2).view(batch * target_l, dim * 2)
# shrink it: (BT' x 2d) ---> (B x T' x d)
attn_h = self.linear_out(concat_c).view(batch, target_l, dim)
if self.attn_type in ["general", "dot"]:
attn_h = torch.tanh(attn_h) # Eq. (5) in Luong (2015)
# T' = 1 (e.g., input feeding)
if one_step:
attn_h = attn_h.squeeze(1)
align_vectors = align_vectors.squeeze(1)
# Check output sizes
batch_, dim_ = attn_h.size()
aeq(batch, batch_)
aeq(dim, dim_)
batch_, source_l_ = align_vectors.size()
aeq(batch, batch_)
aeq(source_l, source_l_)
else:
attn_h = attn_h.transpose(0, 1).contiguous() # TRANSPOSED
align_vectors = align_vectors.transpose(0, 1).contiguous() # ''
# Check output sizes
target_l_, batch_, dim_ = attn_h.size()
aeq(target_l, target_l_)
aeq(batch, batch_)
aeq(dim, dim_)
target_l_, batch_, source_l_ = align_vectors.size()
aeq(target_l, target_l_)
aeq(batch, batch_)
aeq(source_l, source_l_)
# (T' x B x d) (T' x B x T)
return attn_h, align_vectors
def forward(self, source, memory_bank, memory_lengths=None, coverage=None):
"""
Args:
source (`FloatTensor`): query vectors `[batch x dim]`
memory_bank (`FloatTensor`): source vectors `[batch x src_len x dim]`
memory_lengths (`LongTensor`): the source context lengths `[batch]`
coverage (`FloatTensor`): None (not supported yet)
Returns:
(`FloatTensor`, `FloatTensor`):
* Computed vector `[batch x dim]`
* Attention distribtutions for each query
`[batch x src_len]`
"""
# one step input
assert source.dim() == 2, "Only one step input is supported"
#one_step = True
source = source.unsqueeze(1)
batch, source_l, dim = memory_bank.size()
batch_, target_l, dim_ = source.size()
aeq(batch, batch_)
aeq(dim, dim_)
aeq(self.dim, dim)
# compute attention scores, as in Luong et al.
# [batch x 1 x src_len]
align = self.score(source, memory_bank)
if memory_lengths is not None:
mask = sequence_mask(memory_lengths, max_len=align.size(-1))
mask = mask.unsqueeze(1) # Make it broadcastable.
align.masked_fill_(1 - mask, -float('inf'))
# Softmax or sparsemax to normalize attention weights
if self.attn_func == "softmax":
align_vectors = F.softmax(align.view(batch * target_l, source_l),
-1)
else:
align_vectors = sparsemax(align.view(batch * target_l, source_l),
-1)
align_vectors = align_vectors.view(batch, target_l, source_l)
if coverage is not None:
batch_, source_l_ = coverage.size()
aeq(batch, batch_)
aeq(source_l, source_l_)
if self.coverage_attn and coverage is not None:
# [batch, src_len]
mask = sequence_mask(memory_lengths, max_len=align.size(-1))
# [batch, src_len]
coverage_reversed = -1 * coverage
coverage_reversed.masked_fill_(1 - mask, -float('inf'))
coverage_reversed = F.softmax(coverage_reversed, -1)
coverage_reversed = coverage_reversed.unsqueeze(1)
# we only use the coverage_reversed to rescale the current sent attention and do not backward the gradient
coverage_reversed = coverage_reversed.detach()
align_vectors = align_vectors * coverage_reversed
norm_term = align_vectors.sum(dim=2, keepdim=True)
align_vectors = align_vectors / norm_term
# each context vector c_t is the weighted average
# over all the source hidden states
# [batch, target_l, dim]
c = torch.bmm(align_vectors, memory_bank)
# [batch, dim]
returned_vec = c.squeeze(1)
# # concatenate
if self.output_attn_h:
concat_c = torch.cat([c, source], 2).view(batch * target_l,
dim * 2)
attn_h = self.linear_out(concat_c).view(batch, target_l, dim)
if self.attn_type in ["general", "dot"]:
attn_h = torch.tanh(attn_h)
attn_h = attn_h.squeeze(1)
returned_vec = attn_h
align_vectors = align_vectors.squeeze(1)
# Check output sizes
batch_, dim_ = returned_vec.size()
aeq(batch, batch_)
aeq(dim, dim_)
# Check output sizes
batch_, source_l_ = align_vectors.size()
aeq(batch, batch_)
aeq(source_l, source_l_)
return returned_vec, align_vectors
def forward(self,
source,
memory_bank,
memory_lengths=None,
coverage=None,
sent_align_vectors=None,
sent_position_tuple=None,
src_word_sent_ids=None):
"""
Only one-step attention is supported now.
Args:
source (`FloatTensor`): query vectors `[batch x dim]`
memory_bank (`FloatTensor`): word_memory_bank is `FloatTensor` with shape `[batch x src_len x dim]`
memory_lengths (`LongTensor`): for word_memory_bank, `[batch]`
coverage (`FloatTensor`): None (not supported yet)
sent_align_vectors (`FloatTensor`): the computed sentence align distribution, `[batch x s_num]`
sent_position_tuple (:obj: `tuple`): Only used for seqhr_enc (sent_p, sent_nums) with size
`([batch_size, s_num, 2], [batch])`.
src_word_sent_ids (:obj: `tuple'): (word_sent_ids, src_lengths) with size `([batch, src_len], [batch])'
use_tanh (`bool`): True, whether use tanh activation function for `general` and 'dot' attention
Returns:
(`FloatTensor`, `FloatTensor`):
* Computed word attentional vector `[batch x dim]`
* Word Attention distribtutions for the query of word `[batch x src_len]`
"""
# only one step input is supported
assert source.dim(
) == 2, "Only one step input is supported for current attention."
assert isinstance(sent_position_tuple, tuple)
sent_position, sent_nums = sent_position_tuple
one_step = True
# [batch, 1, dim]
source = source.unsqueeze(1)
batch, tgt_l, dim = source.size()
# check the specification for word level attention
assert sent_align_vectors is not None, "For word level attention, the 'sent_align' must be specified."
assert sent_position is not None, "For word level attention, the 'sent_position' must be specified."
assert sent_nums is not None, "For word level attention, the 'sent_nums' must be specified."
assert memory_lengths is not None, "The lengths for the word memory bank are required."
sent_lens = memory_lengths
batch_1, src_len, dim_ = memory_bank.size()
batch_2, sent_num = sent_align_vectors.size()
batch_3 = sent_nums.size(0)
aeq(batch, batch_1, batch_2, batch_3)
aeq(dim, dim_, self.dim)
# if coverage is not None:
# batch_, source_l_ = coverage.size()
# aeq(batch, batch_)
# aeq(source_l, source_l_)
#
# if coverage is not None:
# cover = coverage.view(-1).unsqueeze(1)
# memory_bank += self.linear_cover(cover).view_as(memory_bank)
# memory_bank = torch.tanh(memory_bank)
# compute word attention scores, as in Luong et al.
# [batch, 1, src_len]
word_align = self.score(source, memory_bank)
# [batch, src_len]
word_align = word_align.squeeze(1)
# [batch, src_len]
word_mask = sequence_mask(memory_lengths, max_len=word_align.size(-1))
# [batch, src_len]
word_align.masked_fill_(1 - word_mask, -float('inf'))
# Softmax or sparsemax to normalize attention weights
if self.attn_func == "softmax":
align_vectors = F.softmax(word_align, -1)
else:
align_vectors = sparsemax(word_align, -1)
if self.seqHRE_attn_rescale:
word_sent_ids, memory_lengths_ = src_word_sent_ids
assert memory_lengths.eq(memory_lengths_).all(), \
"The src lengths in src_word_sent_ids should be the same as the memory_lengths"
# # attention score reweighting method 1
# # broadcast the sent_align_vectors from [batch, sent_num] to [batch, src_len]
# # according to sent_position [batch, sent_num, 2] and sent_nums [batch]
# expand_sent_align_vectors = []
# for b_idx in range(batch):
# one_ex_expand = []
# for sent_idx in range(sent_num):
# sent_token_num = sent_position[b_idx][sent_idx][0] - sent_position[b_idx][sent_idx][1] + 1
# if sent_token_num != 1:
# one_ex_expand.append(sent_align_vectors[b_idx][sent_idx].expand(sent_token_num))
# else:
# break
# one_ex_expand = torch.cat(one_ex_expand, dim=0)
# if one_ex_expand.size(0) < src_len:
# pad_vector = torch.zeros([src_len - one_ex_expand.size(0)],
# dtype=one_ex_expand.dtype, device=one_ex_expand.device)
# one_ex_expand = torch.cat([one_ex_expand, pad_vector], dim=0).contiguous()
# expand_sent_align_vectors.append(one_ex_expand)
#
# # [batch, src_len]
# expand_sent_align_vectors = torch.stack(expand_sent_align_vectors, dim=0).contiguous()
# # reweight and renormalize the word align_vectors
# align_vectors = align_vectors * expand_sent_align_vectors
# norm_term = align_vectors.sum(dim=1, keepdim=True)
# align_vectors = align_vectors / norm_term
# attention score reweighting method 2
# word_sent_ids: [batch, src_len]
# sent_align_vectors: [batch, sent_num]
# expand_sent_align_vectors: [batch, src_len]
expand_sent_align_vectors = sent_align_vectors.gather(
dim=1, index=word_sent_ids)
# # reweight and renormalize the word align_vectors
# Although word_sent_ids are padded with 0s which will gather the attention score of the sentence 0
# align_vectors are 0.0000 on these padded places.
align_vectors = align_vectors * expand_sent_align_vectors
norm_term = align_vectors.sum(dim=1, keepdim=True)
align_vectors = align_vectors / norm_term
# each context vector c_t is the weighted average
# over all the source hidden states
# [batch, 1, src_len]
align_vectors = align_vectors.unsqueeze(1)
# [batch, 1, src_len] x [batch, src_len, dim] -> [batch, 1, dim]
c = torch.bmm(align_vectors, memory_bank)
# [batch, dim]
c = c.squeeze(1)
returned_vec = c
# If output_attn_h == False, we put linear out layer on decoder part
if self.output_attn_h:
# concatenate
# [batch, dim]
source = source.squeeze(1)
# [batch, 2*dim]
concat_c = torch.cat([c, source], 1)
# [batch, dim]
attn_h = self.linear_out(concat_c)
if self.attn_type in ["general", "dot"]:
attn_h = torch.tanh(attn_h)
returned_vec = attn_h
# [batch, src_len]
align_vectors = align_vectors.squeeze(1)
# Check output sizes
batch_1, dim_ = returned_vec.size()
batch_2, _ = align_vectors.size()
aeq(batch, batch_1, batch_2)
aeq(dim, dim_)
return returned_vec, align_vectors
rel2id[id2emotion[e]] for e in tgt_emotions[s_id:e_id]
]) # (batch, )
# print(batch_rel_ids)
# batch_score = -torch.norm(ent_emb[batch_concept_ids].unsqueeze(2) +
# rel_emb[batch_rel_ids].unsqueeze(1).unsqueeze(2) - ent_emb.unsqueeze(0).unsqueeze(0), dim=-1) # (batch, max_num, vocab), costly
batch_score = torch.mm((ent_emb[batch_concept_ids] + rel_emb[batch_rel_ids].unsqueeze(1)).view(-1, ent_emb_dim), ent_emb.transpose(1,0))\
.view(len(batch_concept_ids), max_num_concepts, -1) # (batch, max_num, vocab)
# batch_score = -torch.norm(ent_emb[batch_concept_ids].unsqueeze(2) *
# rel_emb[batch_rel_ids].unsqueeze(1).unsqueeze(2) - ent_emb.unsqueeze(0).unsqueeze(0), p=1, dim=-1) # (batch, max_num, vocab), costly
if s_id == 0:
print(src_concepts[:3])
print(tgt_emotions[:3])
if use_sparsemax:
batch_attn = sparsemax(sparsemax_temp * batch_score,
-1) # (batch, max_num, vocab)
combined_emb = torch.mm(
batch_attn.view(-1, batch_attn.shape[-1]),
concept_embedding).view(-1, max_num_concepts, emb_dim)
elif top_k != 0:
top_k_scores, top_k_indices = batch_score.topk(
top_k,
dim=2) # (batch, max_num, top_k), (batch, max_num, top_k)
top_k_attn = torch.softmax(top_k_scores,
dim=-1) # (batch, max_num, top_k)
if s_id == 0:
print("Top k probs: ", top_k_attn[:3, 0])
# augment VAD
if concept_VAD_strength_embedding is not None:
VAD_attn = torch.softmax(
concept_VAD_strength_temp *
def forward(self, source, memory_bank, memory_lengths=None, coverage=None, modification_method=None):
"""
Args:
source (FloatTensor): query vectors ``(batch, tgt_len, dim)``
memory_bank (FloatTensor): source vectors ``(batch, src_len, dim)``
memory_lengths (LongTensor): the source context lengths ``(batch,)``
coverage (FloatTensor): None (not supported yet)
Returns:
(FloatTensor, FloatTensor):
* Computed vector ``(tgt_len, batch, dim)``
* Attention distribtutions for each query
``(tgt_len, batch, src_len)``
"""
# one step input
if source.dim() == 2:
one_step = True
source = source.unsqueeze(1)
else:
one_step = False
batch, source_l, dim = memory_bank.size()
batch_, target_l, dim_ = source.size()
aeq(batch, batch_)
aeq(dim, dim_)
aeq(self.dim, dim)
if coverage is not None:
batch_, source_l_ = coverage.size()
aeq(batch, batch_)
aeq(source_l, source_l_)
if coverage is not None:
cover = coverage.view(-1).unsqueeze(1)
memory_bank += self.linear_cover(cover).view_as(memory_bank)
memory_bank = torch.tanh(memory_bank)
# compute attention scores, as in Luong et al.
# dimension: batch x target len x source len
align = self.score(source, memory_bank)
if modification_method is not None:
align = align.detach() # Is this OK?
top_indices = torch.argsort(align, descending=True)
memory_lengths_vector = memory_lengths.cpu()
for i in range(align.shape[0]):
true_length = memory_lengths_vector[i]#true_length_vector[i] #memory_lengths[i]
if modification_method == 'uniform':
align[i,:,:true_length] = 1
continue
for j in range(align.shape[1]):
if modification_method == 'zero_out_max':
max_index = align[i][j][0:true_length].argmax()
align[i][j][max_index] = -float('inf')
elif modification_method == 'random_permute':
rand_indices = torch.randperm(true_length, requires_grad=False)
#cloned = align[i,j,rand_indices].clone()
align[i,j,0:true_length] = align[i,j,rand_indices]#.clone()
#align[i,j,0:true_length] = cloned
elif modification_method == 'second_max':
#top_indices = torch.argsort(align[i][j][:true_length], descending=True)
if true_length <= 2:
continue
first_max = None
second_max = None
third_max = None
for el in top_indices[i][j].cpu():
if el >= true_length:#.cuda(el.get_device()):
continue
if first_max is None:
first_max = el
elif second_max is None:
second_max = el
elif third_max is None:
third_max = el
else:
break
align[i][j][first_max] = align[i][j][third_max]
else:
print(">>> shit (Nothing was selected for attetnion modification) <<< ")
if memory_lengths is not None:
mask = sequence_mask(memory_lengths, max_len=align.size(-1))
mask = mask.unsqueeze(1) # Make it broadcastable.
align.masked_fill_(~mask, -float('inf'))
# Softmax or sparsemax to normalize attention weights
if self.attn_func == "softmax":
align_vectors = F.softmax(align.view(batch*target_l, source_l), -1)
else:
align_vectors = sparsemax(align.view(batch*target_l, source_l), -1)
align_vectors = align_vectors.view(batch, target_l, source_l)
# each context vector c_t is the weighted average
# over all the source hidden states
c = torch.bmm(align_vectors, memory_bank)
# concatenate
concat_c = torch.cat([c, source], 2).view(batch*target_l, dim*2)
attn_h = self.linear_out(concat_c).view(batch, target_l, dim)
if self.attn_type in ["general", "dot"]:
attn_h = torch.tanh(attn_h)
if one_step:
attn_h = attn_h.squeeze(1)
align_vectors = align_vectors.squeeze(1)
# Check output sizes
batch_, dim_ = attn_h.size()
aeq(batch, batch_)
aeq(dim, dim_)
batch_, source_l_ = align_vectors.size()
aeq(batch, batch_)
aeq(source_l, source_l_)
else:
attn_h = attn_h.transpose(0, 1).contiguous()
align_vectors = align_vectors.transpose(0, 1).contiguous()
# Check output sizes
target_l_, batch_, dim_ = attn_h.size()
aeq(target_l, target_l_)
aeq(batch, batch_)
aeq(dim, dim_)
target_l_, batch_, source_l_ = align_vectors.size()
aeq(target_l, target_l_)
aeq(batch, batch_)
aeq(source_l, source_l_)
return attn_h, align_vectors
def get_sparse_attention(src_ent, rel):
src_ent_emb_ = ent_emb[ent2id[src_ent]]
rel_emb_ = rel_emb[rel2id[rel]]
return sparsemax(-torch.norm(src_ent_emb_ + rel_emb_ - ent_emb, dim=1), -1)
def test_sparsemax():
for _ in range(10):
x = 0.5 * torch.randn(10, 30000, dtype=torch.float32)
p1 = sparsemax(x, 1)
p2 = sparsemax_bisect(x)
assert torch.sum((p1 - p2)**2) < 1e-7
def forward(self, source, memory_bank, memory_lengths=None, coverage=None):
'''
added by zhengquan
调用的时候是
#rnn_output.size() = [3,100] =[batch_size, hidden_size]
if self.attentional:
#p_attn是什么呢？为什么每次的维度还不一样呢？p.attn.size()=[3,32]=[batch_size,32]32是什么?最可怕的是这个维度的大小还随着样例的不同而改变。
#memory_bank.size() = [32,3,100] =[src_len,batch_size,rnn_size],可能上面的那个src也就是src_len
#memory_lengths.size() = [3] ,memory_lengths= [32,32,31]
decoder_output, p_attn = self.attn(
rnn_output,
memory_bank.transpose(0, 1),
memory_lengths=memory_lengths)
attns["std"].append(p_attn)
'''
"""
Args:
source (FloatTensor): query vectors ``(batch, tgt_len, dim)``
memory_bank (FloatTensor): source vectors ``(batch, src_len, dim)``
memory_lengths (LongTensor): the source context lengths ``(batch,)``
coverage (FloatTensor): None (not supported yet)
Returns:
(FloatTensor, FloatTensor):
* Computed vector ``(tgt_len, batch, dim)``
* Attention distribtutions for each query
``(tgt_len, batch, src_len)``
"""
# one step input
if source.dim() == 2:
one_step = True
source = source.unsqueeze(1) #[batch_size , 1 , hidden_size]
else:
one_step = False
batch, source_l, dim = memory_bank.size()
batch_, target_l, dim_ = source.size()
aeq(batch, batch_)
aeq(dim, dim_)
aeq(self.dim, dim)
if coverage is not None:
batch_, source_l_ = coverage.size()
aeq(batch, batch_)
aeq(source_l, source_l_)
if coverage is not None:
cover = coverage.view(-1).unsqueeze(1)
memory_bank += self.linear_cover(cover).view_as(memory_bank)
memory_bank = torch.tanh(memory_bank)
# compute attention scores, as in Luong et al.
align = self.score(source, memory_bank)
#[batch_size,tgt_l(=1),src_l]
# print("I love you")
# import pdb
# pdb.set_trace()
if memory_lengths is not None:
mask = sequence_mask(memory_lengths, max_len=align.size(-1))
mask = mask.unsqueeze(1) # Make it broadcastable.
align.masked_fill_(1 - mask, -float('inf'))
# Softmax or sparsemax to normalize attention weights
if self.attn_func == "softmax":
align_vectors = F.softmax(align.view(batch * target_l, source_l),
-1)
else:
align_vectors = sparsemax(align.view(batch * target_l, source_l),
-1)
align_vectors = align_vectors.view(batch, target_l, source_l)
# each context vector c_t is the weighted average
# over all the source hidden states
c = torch.bmm(align_vectors, memory_bank)
# concatenate
concat_c = torch.cat([c, source], 2).view(batch * target_l, dim * 2)
attn_h = self.linear_out(concat_c).view(batch, target_l, dim)
if self.attn_type in ["general", "dot"]:
attn_h = torch.tanh(attn_h)
if one_step:
attn_h = attn_h.squeeze(1)
align_vectors = align_vectors.squeeze(1)
# Check output sizes
batch_, dim_ = attn_h.size()
aeq(batch, batch_)
aeq(dim, dim_)
batch_, source_l_ = align_vectors.size()
aeq(batch, batch_)
aeq(source_l, source_l_)
else:
attn_h = attn_h.transpose(0, 1).contiguous()
align_vectors = align_vectors.transpose(0, 1).contiguous()
# Check output sizes
target_l_, batch_, dim_ = attn_h.size()
aeq(target_l, target_l_)
aeq(batch, batch_)
aeq(dim, dim_)
target_l_, batch_, source_l_ = align_vectors.size()
aeq(target_l, target_l_)
aeq(batch, batch_)
aeq(source_l, source_l_)
return attn_h, align_vectors
def forward(self, source, memory_bank, memory_lengths=None, coverage=None, experiment_type=None):
"""
Args:
source (FloatTensor): query vectors ``(batch, tgt_len, dim)``
memory_bank (FloatTensor): source vectors ``(batch, src_len, dim)``
memory_lengths (LongTensor): the source context lengths ``(batch,)``
coverage (FloatTensor): None (not supported yet)
experiment_type : Type of experiment. Possible values: permute, zero_out, equal_weight, last_state
Returns:
(FloatTensor, FloatTensor):
* Computed vector ``(tgt_len, batch, dim)``
* Attention distribtutions for each query
``(tgt_len, batch, src_len)``
"""
# one step input
if source.dim() == 2:
one_step = True
source = source.unsqueeze(1)
else:
one_step = False
batch, source_l, dim = memory_bank.size()
batch_, target_l, dim_ = source.size()
aeq(batch, batch_)
aeq(dim, dim_)
aeq(self.dim, dim)
if coverage is not None:
batch_, source_l_ = coverage.size()
aeq(batch, batch_)
aeq(source_l, source_l_)
if coverage is not None:
cover = coverage.view(-1).unsqueeze(1)
memory_bank += self.linear_cover(cover).view_as(memory_bank)
memory_bank = torch.tanh(memory_bank)
# compute attention scores, as in Luong et al.
align = self.score(source, memory_bank)
#import math
#print("size of align: ")
#print(align.size())
#max_attention = -math.inf
#max_index = 0
#for i in range(align.size()[2]):
# if(align[0][0][i] >= max_attention):
# max_attention = align[0][0][i]
# max_index = i
# print(align[0][0][i])
#print("Attended mostly to source position %d with attention value: %f" % (max_index, max_attention))
#print("#"*20)
# i is batch index, j is target token index, third dimension is for source token index
if experiment_type is not None and experiment_type not in ['zero_out', 'keep_max_uniform_others']:
assert (align.size()[1] == 1)
new_align = align.clone().cpu().numpy()
for i in range(align.size()[0]):
length = memory_lengths[i] if memory_lengths is not None else new_align[i][j].size()[0]
for j in range(align.size()[1]):
if experiment_type == 'permute':
max_index = new_align[i][j][0:length].argmax()
succeed = False
for _ in range(10):
random.shuffle(new_align[i][j][0:length])
if(new_align[i][j][0:length].argmax() != max_index):
succeed = True
break
if succeed is False:
print("Couldn't permute properly! Be careful")
elif experiment_type == 'uniform':
new_align[i][j][0:length] = 1
elif experiment_type == 'last_state':
new_align[i][j][0:length] = -float('inf')
new_align[i][j][length-1] = 1
elif experiment_type == 'only_max':
keep_k = 1
indices = new_align[i][j][0:length].argsort()[-keep_k:][::-1]
backup = np.copy(new_align[i][j][indices])
new_align[i][j][0:length] = -float('inf')
for k in range(keep_k):
new_align[i][j][indices[k]] = backup[k]
elif experiment_type == 'zero_out_max':
max_index = new_align[i][j][0:length].argmax()
new_align[i][j][max_index] = -float('inf')
else:
print(">>> non of them is True <<<")
assert False
align = torch.from_numpy(new_align).cuda()
if memory_lengths is not None:
mask = sequence_mask(memory_lengths, max_len=align.size(-1))
mask = mask.unsqueeze(1) # Make it broadcastable.
align.masked_fill_(1 - mask, -float('inf'))
# Softmax or sparsemax to normalize attention weights
if self.attn_func == "softmax":
align_vectors = F.softmax(align.view(batch*target_l, source_l), -1)
else:
align_vectors = sparsemax(align.view(batch*target_l, source_l), -1)
align_vectors = align_vectors.view(batch, target_l, source_l)
if experiment_type == 'keep_max_uniform_others':
for i in range(align_vectors.size()[0]): # Batch
assert (align_vectors.size()[1] == 1)
length = memory_lengths[i] if memory_lengths is not None else align_vectors[i][0].size()[0]
if(length == 1):
print("length of source is 1!")
continue
max_index = align_vectors[i][0][0:length].argmax()
max_val = align_vectors[i][0][max_index].item()
assert (max_val > 0)
assert (max_val <= 1)
align_vectors[i][0][0:length] = (1 - max_val) * 1.0 / float(length - 1)
align_vectors[i][0][max_index] = max_val
# each context vector c_t is the weighted average
# over all the source hidden states
c = torch.bmm(align_vectors, memory_bank)
# concatenate
concat_c = torch.cat([c, source], 2).view(batch*target_l, dim*2)
attn_h = self.linear_out(concat_c).view(batch, target_l, dim)
if self.attn_type in ["general", "dot"]:
attn_h = torch.tanh(attn_h)
if one_step:
attn_h = attn_h.squeeze(1)
align_vectors = align_vectors.squeeze(1)
# Check output sizes
batch_, dim_ = attn_h.size()
aeq(batch, batch_)
aeq(dim, dim_)
batch_, source_l_ = align_vectors.size()
aeq(batch, batch_)
aeq(source_l, source_l_)
else:
attn_h = attn_h.transpose(0, 1).contiguous()
align_vectors = align_vectors.transpose(0, 1).contiguous()
# Check output sizes
target_l_, batch_, dim_ = attn_h.size()
aeq(target_l, target_l_)
aeq(batch, batch_)
aeq(dim, dim_)
target_l_, batch_, source_l_ = align_vectors.size()
aeq(target_l, target_l_)
aeq(batch, batch_)
aeq(source_l, source_l_)
if experiment_type == 'zero_out':
attn_h = torch.zeros(attn_h.size()).cuda()
return attn_h, align_vectors
def forward(self,
source,
memory_bank,
n,
latt=False,
memory_lengths=None,
coverage=None):
"""
Args:
source (`FloatTensor`): query vectors `[batch x tgt_len x dim]`
memory_bank (`FloatTensor`): source vectors `[batch x src_len x dim]`
memory_lengths (`LongTensor`): the source context lengths `[batch]`
coverage (`FloatTensor`): None (not supported yet)
Returns:
(`FloatTensor`, `FloatTensor`):
* Computed vector `[tgt_len x batch x dim]`
* Attention distribtutions for each query
`[tgt_len x batch x src_len]`
"""
# one step input
if source.dim() == 2:
one_step = True
source = source.unsqueeze(1)
else:
one_step = False
# one_step = True #latt for lattice use only
batch, source_l, dim = memory_bank.size()
batch_, target_l, dim_ = source.size()
aeq(batch, batch_)
aeq(dim, dim_)
aeq(self.dim, dim)
if coverage is not None:
batch_, source_l_ = coverage.size()
aeq(batch, batch_)
aeq(source_l, source_l_)
if coverage is not None:
cover = coverage.view(-1).unsqueeze(1)
memory_bank += self.linear_cover(cover).view_as(memory_bank)
memory_bank = F.tanh(memory_bank)
# compute attention scores, as in Luong et al.
align = self.score(source, memory_bank)
if memory_lengths is not None:
mask = sequence_mask(memory_lengths, max_len=align.size(-1))
mask = mask.unsqueeze(1) # Make it broadcastable.
align.masked_fill_(1 - mask, -float('inf'))
# print('align', align)
# Softmax or sparsemax to normalize attention weights
if self.attn_func == "softmax":
align_vectors = F.softmax(align.view(batch * target_l, source_l),
-1) # latt comment align vectors
else:
align_vectors = sparsemax(align.view(batch * target_l, source_l),
-1)
align_vectors = align_vectors.view(batch, target_l, source_l)
# each context vector c_t is the weighted average
# over all the source hidden states
c = torch.bmm(align_vectors, memory_bank)
# concatenate context and source
concat_c = torch.cat([c, source], 2).view(batch * target_l, dim * 2)
attn_h = self.linear_out(concat_c).view(batch, target_l, dim)
if self.attn_type in ["general", "dot"]:
attn_h = F.tanh(attn_h)
if one_step:
attn_h = attn_h.squeeze(1)
align_vectors = align_vectors.squeeze(1)
# Check output sizes
batch_, dim_ = attn_h.size()
aeq(batch, batch_)
aeq(dim, dim_)
batch_, source_l_ = align_vectors.size()
aeq(batch, batch_)
aeq(source_l, source_l_)
else:
# print('test else in global attn', attn_h.size()) #test
# attn_h = attn_h.transpose(0, 1).contiguous() # comment out for lattice
# latt
align_vectors = align_vectors.transpose(0, 1).contiguous()
# Check output sizes
#target_l_, batch_, dim_ = attn_h.size()
batch_, target_l_, dim_ = attn_h.size() #latt use only
aeq(target_l, target_l_)
aeq(batch, batch_)
aeq(dim, dim_)
target_l_, batch_, source_l_ = align_vectors.size()
aeq(target_l, target_l_)
aeq(batch, batch_)
aeq(source_l, source_l_)
#print('global attn attn_h, align_vectors', attn_h.size(), align_vectors.size()) # latt
#global attn attn_h, align_vectors torch.Size([1, 9, 256]) torch.Size([9, 1, 27])
# no. of sen x max length x dim
#global attn attn_h, align_vectors torch.Size([2, 17, 256]) torch.Size([17, 2, 51])
#print('attn_h', attn_h) # latt
torch.set_printoptions(profile="full")
#print('align_vectors', align_vectors) # latt
logger.info('align_vectors') # latt
logger.info(align_vectors) # latt
align_vectors[align_vectors == 0.5] = 0
align_sum = torch.sum(align_vectors, 1)
# logger.info(align_sum)
# latt
torch.set_printoptions(profile="default")
return attn_h, align_vectors, align_sum #latt ignore
def forward(
self,
source: torch.FloatTensor, # [batch, tgt_len, dim]
memory_bank_list: List[
torch.FloatTensor], # [num_srcs] x [batch, src_len, dim]
memory_lengths_list: List[
torch.FloatTensor] = None, # [num_srcs] x [batch]
coverage=None
) -> Tuple[torch.FloatTensor, torch.FloatTensor]:
assert coverage is None
# one step input
if source.dim() == 2:
one_step = True
source = source.unsqueeze(1)
else:
one_step = False
# end if
# Join memory bank
memory_bank = torch.cat(memory_bank_list, dim=1)
batch, source_l, dim = memory_bank.size()
batch_, target_l, dim_ = source.size()
aeq(batch, batch_)
aeq(dim, dim_)
aeq(self.dim, dim)
if coverage is not None:
batch_, source_l_ = coverage.size()
aeq(batch, batch_)
aeq(source_l, source_l_)
if coverage is not None:
cover = coverage.view(-1).unsqueeze(1)
memory_bank += self.linear_cover(cover).view_as(memory_bank)
memory_bank = torch.tanh(memory_bank)
# compute attention scores, as in Luong et al.
align = self.score(source, memory_bank)
if memory_lengths_list is not None:
mask = torch.cat([
sequence_mask(memory_lengths,
max_len=memory_bank_list[src_i].size(1))
for src_i, memory_lengths in enumerate(memory_lengths_list)
],
dim=1)
mask = mask.unsqueeze(1) # Make it broadcastable.
align.masked_fill_(1 - mask, -float('inf'))
# end if
# Softmax or sparsemax to normalize attention weights
if self.attn_func == "softmax":
align_vectors = F.softmax(align.view(batch * target_l, source_l),
-1)
else:
align_vectors = sparsemax(align.view(batch * target_l, source_l),
-1)
align_vectors = align_vectors.view(batch, target_l, source_l)
# each context vector c_t is the weighted average
# over all the source hidden states
c = torch.bmm(align_vectors, memory_bank)
# concatenate
concat_c = torch.cat([c, source], 2).view(batch * target_l, dim * 2)
attn_h = self.linear_out(concat_c).view(batch, target_l, dim)
if self.attn_type in ["general", "dot"]:
attn_h = torch.tanh(attn_h)
# end if
if one_step:
attn_h = attn_h.squeeze(1)
align_vectors = align_vectors.squeeze(1)
# Check output sizes
batch_, dim_ = attn_h.size()
aeq(batch, batch_)
aeq(dim, dim_)
batch_, source_l_ = align_vectors.size()
aeq(batch, batch_)
aeq(source_l, source_l_)
else:
attn_h = attn_h.transpose(0, 1).contiguous()
align_vectors = align_vectors.transpose(0, 1).contiguous()
# Check output sizes
target_l_, batch_, dim_ = attn_h.size()
aeq(target_l, target_l_)
aeq(batch, batch_)
aeq(dim, dim_)
target_l_, batch_, source_l_ = align_vectors.size()
aeq(target_l, target_l_)
aeq(batch, batch_)
aeq(source_l, source_l_)
# end if
return attn_h, align_vectors
def forward(self,
source,
memory_bank,
memory_lengths=None,
coverage=None,
sent_align_vectors=None):
"""
Args:
source (`FloatTensor`): query vectors `[batch x dim]`
memory_bank (`FloatTensor`): source vectors `[batch x src_len x dim]`
memory_lengths (`LongTensor`): the source context lengths `[batch]`
coverage (`FloatTensor`): None (not supported yet)
sent_align_vectors (`FloatTensor`): sentence level attention cores `[batch x src_len]`
Returns:
(`FloatTensor`, `FloatTensor`):
* Computed vector `[batch x dim]`
* Attention distribtutions for each query
`[batch x src_len]`
"""
# one step input
assert source.dim() == 2, "Only one step input is supported"
#one_step = True
source = source.unsqueeze(1)
sent_align_vectors = sent_align_vectors.unsqueeze(1)
batch, src_len, dim = memory_bank.size()
batch1, tgt_len, dim1 = source.size()
batch2, tgt_len2, src_len2 = sent_align_vectors.size()
aeq(batch, batch1, batch2)
aeq(self.dim, dim, dim1)
aeq(src_len, src_len2)
aeq(tgt_len, tgt_len2)
# if coverage is not None:
# batch_, source_l_ = coverage.size()
# aeq(batch, batch_)
# aeq(source_l, source_l_)
# if coverage is not None:
# cover = coverage.view(-1).unsqueeze(1)
# memory_bank += self.linear_cover(cover).view_as(memory_bank)
# memory_bank = torch.tanh(memory_bank)
# compute attention scores, as in Luong et al.
# [batch, tgt_len, src_len]
align = self.score(source, memory_bank)
if memory_lengths is not None:
mask = sequence_mask(memory_lengths, max_len=align.size(-1))
mask = mask.unsqueeze(1) # Make it broadcastable.
align.masked_fill_(1 - mask, -float('inf'))
# Softmax or sparsemax to normalize attention weights
if self.attn_func == "softmax":
align_vectors = F.softmax(align.view(batch * tgt_len, src_len), -1)
else:
align_vectors = sparsemax(align.view(batch * tgt_len, src_len), -1)
align_vectors = align_vectors.view(batch, tgt_len, src_len)
# rescale the word attention scores using the sent_align_vec
align_vectors = align_vectors * sent_align_vectors
norm_vec = align_vectors.sum(dim=-1, keepdim=True)
align_vectors = align_vectors / norm_vec
# each context vector c_t is the weighted average
# over all the source hidden states
# [batch, tgt_len, dim]
c = torch.bmm(align_vectors, memory_bank)
# [batch, dim]
returned_vec = c.squeeze(1)
# # concatenate
if self.output_attn_h:
concat_c = torch.cat([c, source], 2).view(batch * tgt_len, dim * 2)
attn_h = self.linear_out(concat_c).view(batch, tgt_len, dim)
if self.attn_type in ["general", "dot"]:
attn_h = torch.tanh(attn_h)
attn_h = attn_h.squeeze(1)
returned_vec = attn_h
align_vectors = align_vectors.squeeze(1)
# Check output sizes
batch_, dim_ = returned_vec.size()
aeq(batch, batch_)
aeq(dim, dim_)
# Check output sizes
batch_, src_len_ = align_vectors.size()
aeq(batch, batch_)
aeq(src_len, src_len_)
return returned_vec, align_vectors