def forward(self, inputs, add_bos=False, add_eos=False):
conf: PosiInputEmbedderConf = self.conf
# --
try:
# input is a shape as prepared by "PosiHelper"
batch_size, max_len = inputs
if add_bos:
max_len += 1
if add_eos:
max_len += 1
posi_idxes = BK.arange_idx(max_len) # [?len?]
ret = self.E(posi_idxes).unsqueeze(0).expand(batch_size, -1, -1)
except:
# input is tensor
posi_idxes = BK.input_idx(inputs) # [*, len]
cur_maxlen = BK.get_shape(posi_idxes, -1)
# --
all_input_slices = []
slice_shape = BK.get_shape(posi_idxes)[:-1] + [1]
if add_bos: # add 0 and offset
all_input_slices.append(
BK.constants(slice_shape, 0, dtype=posi_idxes.dtype))
cur_maxlen += 1
posi_idxes += 1
all_input_slices.append(posi_idxes) # [*, len]
if add_eos:
all_input_slices.append(
BK.constants(slice_shape,
cur_maxlen,
dtype=posi_idxes.dtype))
final_input_t = BK.concat(all_input_slices, -1) # [*, 1?+len+1?]
# finally
ret = self.E(final_input_t) # [*, ??, dim]
return ret
def predict(self, insts: List[Sent], input_expr: BK.Expr, mask_expr: BK.Expr):
conf: MySRLConf = self.conf
slen = BK.get_shape(mask_expr, -1)
# --
# =====
# evt
_, all_evt_cfs, all_evt_raw_scores = self.evt_node.get_all_values() # [*, slen, Le]
all_evt_scores = [z.log_softmax(-1) for z in all_evt_raw_scores]
final_evt_scores = self.evt_node.helper.pred(all_logprobs=all_evt_scores, all_cfs=all_evt_cfs) # [*, slen, Le]
if conf.evt_pred_use_all or conf.evt_pred_use_posi: # todo(+W): not an elegant way...
final_evt_scores[:,:,0] += Constants.REAL_PRAC_MIN # all pred sth!!
pred_evt_scores, pred_evt_labels = final_evt_scores.max(-1) # [*, slen]
# =====
# arg
_, all_arg_cfs, all_arg_raw_score = self.arg_node.get_all_values() # [*, slen, slen, La]
all_arg_scores = [z.log_softmax(-1) for z in all_arg_raw_score]
final_arg_scores = self.arg_node.helper.pred(all_logprobs=all_arg_scores, all_cfs=all_arg_cfs) # [*, slen, slen, La]
# slightly more efficient by masking valid evts??
full_pred_shape = BK.get_shape(final_arg_scores)[:-1] # [*, slen, slen]
pred_arg_scores, pred_arg_labels = BK.zeros(full_pred_shape), BK.zeros(full_pred_shape).long()
arg_flat_mask = (pred_evt_labels > 0) # [*, slen]
flat_arg_scores = final_arg_scores[arg_flat_mask] # [??, slen, La]
if not BK.is_zero_shape(flat_arg_scores): # at least one predicate!
if self.pred_cons_mat is not None:
flat_mask_expr = mask_expr.unsqueeze(-2).expand(-1, slen, slen)[arg_flat_mask] # [*, 1->slen, slen] => [??, slen]
flat_pred_arg_labels, flat_pred_arg_scores = BigramInferenceHelper.inference_search(
flat_arg_scores, self.pred_cons_mat, flat_mask_expr, conf.arg_beam_k) # [??, slen]
else:
flat_pred_arg_scores, flat_pred_arg_labels = flat_arg_scores.max(-1) # [??, slen]
pred_arg_scores[arg_flat_mask] = flat_pred_arg_scores
pred_arg_labels[arg_flat_mask] = flat_pred_arg_labels
# =====
# assign
self.helper.put_results(insts, pred_evt_labels, pred_evt_scores, pred_arg_labels, pred_arg_scores)
def forward(self, inputs, add_bos=False, add_eos=False):
conf: PlainInputEmbedderConf = self.conf
# --
voc = self.voc
input_t = BK.input_idx(inputs) # [*, len]
# rare unk in training
if self.is_training() and self.use_rare_unk:
rare_unk_rate = conf.rare_unk_rate
cur_unk_imask = (
self.rare_unk_mask[input_t] *
(BK.rand(BK.get_shape(input_t)) < rare_unk_rate)).long()
input_t = input_t * (1 - cur_unk_imask) + voc.unk * cur_unk_imask
# bos and eos
all_input_slices = []
slice_shape = BK.get_shape(input_t)[:-1] + [1]
if add_bos:
all_input_slices.append(
BK.constants(slice_shape, voc.bos, dtype=input_t.dtype))
all_input_slices.append(input_t) # [*, len]
if add_eos:
all_input_slices.append(
BK.constants(slice_shape, voc.eos, dtype=input_t.dtype))
final_input_t = BK.concat(all_input_slices, -1) # [*, 1?+len+1?]
# finally
ret = self.E(final_input_t) # [*, ??, dim]
return ret
def forward(self, input_t: BK.Expr, edges: BK.Expr, mask_t: BK.Expr):
_isize = self.conf._isize
_ntype = self.conf.type_num
_slen = BK.get_shape(edges, -1)
# --
edges3 = edges.clamp(min=-1, max=1) + 1
edgesF = edges + _ntype # offset to positive!
# get hid
hid0 = BK.matmul(input_t, self.W_hid).view(
BK.get_shape(input_t)[:-1] + [3, _isize]) # [*, L, 3, D]
hid1 = hid0.unsqueeze(-4).expand(-1, _slen, -1, -1,
-1) # [*, L, L, 3, D]
hid2 = BK.gather_first_dims(hid1.contiguous(), edges3.unsqueeze(-1),
-2).squeeze(-2) # [*, L, L, D]
hidB = self.b_hid[edgesF] # [*, L, L, D]
_hid = hid2 + hidB
# get gate
gate0 = BK.matmul(input_t, self.W_gate) # [*, L, 3]
gate1 = gate0.unsqueeze(-3).expand(-1, _slen, -1, -1) # [*, L, L, 3]
gate2 = gate1.gather(-1, edges3.unsqueeze(-1)) # [*, L, L, 1]
gateB = self.b_gate[edgesF].unsqueeze(-1) # [*, L, L, 1]
_gate0 = BK.sigmoid(gate2 + gateB)
_gmask0 = (
(edges != 0) |
(BK.eye(_slen) > 0)).float() * mask_t.unsqueeze(-2) # [*,L,L]
_gate = _gate0 * _gmask0.unsqueeze(-1) # [*,L,L,1]
# combine
h0 = BK.relu((_hid * _gate).sum(-2)) # [*, L, D]
h1 = self.drop_node(h0)
# add & norm?
if self.ln is not None:
h1 = self.ln(h1 + input_t)
return h1
def forward(self, med: ZMediator):
ibatch_seq_info = med.ibatch.seq_info
# prepare input, truncate if too long
_input_ids, _input_masks, _input_segids = \
ibatch_seq_info.enc_input_ids, ibatch_seq_info.enc_input_masks, ibatch_seq_info.enc_input_segids
_eff_input_ids = med.get_cache('eff_input_ids') # note: special name!!
if _eff_input_ids is not None:
_input_ids = _eff_input_ids
# --
if BK.get_shape(_input_ids, -1) > self.tokenizer.model_max_length:
_full_len = BK.get_shape(_input_ids, -1)
_max_len = self.tokenizer.model_max_length
zwarn(
f"Input too long for bert, truncate it: {BK.get_shape(_input_ids)} => {_max_len}"
)
_input_ids, _input_masks, _input_segids = \
_input_ids[:,:_max_len], _input_masks[:,:_max_len], _input_segids[:,:_max_len]
# todo(+W+N): how to handle decoders for these cases?
# forward
ret = self.bert.forward(_input_ids,
_input_masks,
_input_segids,
med=med)
# extra
if self.gcn:
ret = self.gcn.forward(med)
# --
return ret
def lookup_flatten(self, insts: Union[List[Sent], List[Frame]], input_expr: BK.Expr, mask_expr: BK.Expr,
pair_expr: BK.Expr = None):
arr_items, mlp_expr, zmask_expr, extra_info = self.lookup(insts, input_expr, mask_expr, pair_expr)
expr_widxes, expr_wlens = extra_info
# flatten
ret_items, ret_sidx, ret_expr, fl_widxes, fl_wlens = LookupNode.flatten_results(
arr_items, zmask_expr, mlp_expr, expr_widxes, expr_wlens)
# --
# also make full expr
# full_masks = ((_arange_t>=fl_widxes.unsqueeze(-1)) & (_arange_t<(fl_widxes+fl_wlens).unsqueeze(-1))).float() # [??, slen]
# ret_full_expr = full_masks.unsqueeze(-1) * ret_expr.unsqueeze(-2) # [??, slen, D]
if self.conf.flatten_lookup_use_dist: # use posi again: [...,-2,-1,0,0,0,1,2,...]
left_widxes = fl_widxes.unsqueeze(-1) # [??, 1]
right_widxes = (fl_widxes+fl_wlens-1).unsqueeze(-1) # [??, 1]
_arange_t = BK.arange_idx(BK.get_shape(mask_expr, 1)).unsqueeze(0) # [1, slen]
dist0 = _arange_t - left_widxes # [??, slen]
dist1 = _arange_t - right_widxes # [??, slen]
full_dist = (_arange_t < left_widxes).long() * dist0 + (_arange_t > right_widxes).long() * dist1
ret_full_expr = self.indicator_norm(self.indicator_embed(full_dist)) # [??, slen, D]
# # ret_full_expr = self.indicator_embed(full_dist) # [??, slen, D]
else: # otherwise 0/1
_arange_t = BK.arange_idx(BK.get_shape(mask_expr, 1)).unsqueeze(0) # [1, slen]
full_ind = ((_arange_t>=fl_widxes.unsqueeze(-1)) & (_arange_t<(fl_widxes+fl_wlens).unsqueeze(-1))).long() # [??, slen]
ret_full_expr = self.indicator_norm(self.indicator_embed(full_ind)) # [??, slen, D]
# --
return ret_items, ret_sidx, ret_expr, ret_full_expr # [??, D]
def forward(self, expr_t: BK.Expr, fixed_scores_t: BK.Expr = None, feed_output=False, mask_t: BK.Expr = None):
conf: SingleBlockConf = self.conf
# --
# pred
if fixed_scores_t is not None:
score_t = fixed_scores_t
cf_t = None
else:
hid1_t = self.hid_in(expr_t) # [*, hid]
score_t = self.pred_in(hid1_t) # [*, nlab]
cf_t = self.aff_cf(hid1_t).squeeze(-1) # [*]
# --
if mask_t is not None:
shape0 = BK.get_shape(expr_t)
shape1 = BK.get_shape(mask_t)
if len(shape1) < len(shape0):
mask_t = mask_t.unsqueeze(-1) # [*, 1]
score_t += Constants.REAL_PRAC_MIN * (1. - mask_t) # [*, nlab]
# --
# output
if feed_output:
W = self.W_getf() # [nlab, hid]
prob_t = score_t.softmax(-1) # [*, nlab]
hid2_t = BK.matmul(prob_t, W) * self.e_mul_scale # [*, hid], todo(+W): need dropout here?
out_t = self.hid_out(hid2_t) # [*, ndim]
final_t = self.norm(out_t + expr_t) # [*, ndim], add and norm
else:
final_t = expr_t # [*, ndim], simply no change and use input!
return score_t, cf_t, final_t # [*, nlab], [*], [*, ndim]
def put_labels(self, arr_items, best_labs, best_scores):
assert BK.get_shape(best_labs) == BK.get_shape(arr_items)
# --
all_arrs = [BK.get_value(z) for z in [best_labs, best_scores]]
for cur_items, cur_labs, cur_scores in zip(arr_items, *all_arrs):
for one_item, one_lab, one_score in zip(cur_items, cur_labs, cur_scores):
if one_item is None: continue
one_lab, one_score = int(one_lab), float(one_score)
one_item.score = one_score
one_item.set_label_idx(one_lab)
one_item.set_label(self.vocab.idx2word(one_lab))
def forward(self, input_expr: BK.Expr, widx_expr: BK.Expr, wlen_expr: BK.Expr):
conf: BaseSpanConf = self.conf
# --
# note: check empty, otherwise error
input_item_shape = BK.get_shape(widx_expr)
if np.prod(input_item_shape) == 0:
return BK.zeros(input_item_shape + [self.output_dim]) # return an empty but shaped tensor
# --
start_idxes, end_idxes = widx_expr, widx_expr+wlen_expr # make [start, end)
# get sizes
bsize, slen = BK.get_shape(input_expr)[:2]
# num_span = BK.get_shape(start_idxes, 1)
arange2_t = BK.arange_idx(bsize).unsqueeze(-1) # [bsize, 1]
# --
reprs = []
if conf.use_starts: # start [start,
reprs.append(input_expr[arange2_t, start_idxes]) # [bsize, ?, D]
if conf.use_ends: # simply ,end-1]
reprs.append(input_expr[arange2_t, end_idxes-1])
if conf.use_softhead:
# expand range
all_span_idxes, all_span_mask = expand_ranged_idxes(widx_expr, wlen_expr, 0, None) # [bsize, ?, MW]
# flatten
flatten_all_span_idxes = all_span_idxes.view(bsize, -1) # [bsize, ?*MW]
flatten_all_span_mask = all_span_mask.view(bsize, -1) # [bsize, ?*MW]
# get softhead score (consider mask here)
softhead_scores = self.softhead_scorer(input_expr).squeeze(-1) # [bsize, slen]
flatten_all_span_scores = softhead_scores[arange2_t, flatten_all_span_idxes] # [bsize, ?*MW]
flatten_all_span_scores += (1.-flatten_all_span_mask) * Constants.REAL_PRAC_MIN
all_span_scores = flatten_all_span_scores.view(all_span_idxes.shape) # [bsize, ?, MW]
# reshape and (optionally topk) and softmax
softhead_topk = conf.softhead_topk
if softhead_topk>0 and BK.get_shape(all_span_scores,-1)>softhead_topk: # further select topk; note: this may save mem
final_span_score, _tmp_idxes = all_span_scores.topk(softhead_topk, dim=-1, sorted=False) # [bsize, ?, K]
final_span_idxes = all_span_idxes.gather(-1, _tmp_idxes) # [bsize, ?, K]
else:
final_span_score, final_span_idxes = all_span_scores, all_span_idxes # [bsize, ?, MW]
final_prob = final_span_score.softmax(-1) # [bsize, ?, ??]
# [bsize, ?, ??, D]
final_repr = input_expr[arange2_t, final_span_idxes.view(bsize, -1)].view(BK.get_shape(final_span_idxes)+[-1])
weighted_repr = (final_repr * final_prob.unsqueeze(-1)).sum(-2) # [bsize, ?, D]
reprs.append(weighted_repr)
if conf.use_width:
cur_width_embed = self.width_embed(wlen_expr) # [bsize, ?, DE]
reprs.append(cur_width_embed)
# concat
concat_repr = BK.concat(reprs, -1) # [bsize, ?, SUM]
if conf.use_proj:
ret = self.final_proj(concat_repr) # [bsize, ?, DR]
else:
ret = concat_repr
return ret
def select_topk_non_overlapping(score_t: BK.Expr,
topk_t: Union[int, BK.Expr],
widx_t: BK.Expr,
wlen_t: BK.Expr,
input_mask_t: BK.Expr,
mask_t: BK.Expr = None,
dim=-1):
score_shape = BK.get_shape(score_t)
assert dim == -1 or dim == len(
score_shape - 1
), "Currently only support last-dim!!" # todo(+2): we can permute to allow any dim!
# --
# prepare K
if isinstance(topk_t, int):
tmp_shape = score_shape.copy()
tmp_shape[dim] = 1 # set it as 1
topk_t = BK.constants_idx(tmp_shape, topk_t)
# --
reshape_trg = [np.prod(score_shape[:-1]).item(), -1] # [*, ?]
_, sorted_idxes_t = score_t.sort(dim, descending=True)
# --
# put it as CPU and use loop; todo(+N): more efficient ways?
arr_sorted_idxes_t, arr_topk_t, arr_widx_t, arr_wlen_t, arr_input_mask_t, arr_mask_t = \
[BK.get_value(z.reshape(reshape_trg)) for z in [sorted_idxes_t, topk_t, widx_t, wlen_t, input_mask_t, mask_t]]
_bsize, _cnum = BK.get_shape(arr_sorted_idxes_t) # [bsize, NUM]
arr_topk_mask = np.full([_bsize, _cnum], 0.) # [bsize, NUM]
_bidx = 0
for aslice_sorted_idxes_t, aslice_topk_t, aslice_widx_t, aslice_wlen_t, aslice_input_mask_t, aslice_mask_t \
in zip(arr_sorted_idxes_t, arr_topk_t, arr_widx_t, arr_wlen_t, arr_input_mask_t, arr_mask_t):
aslice_topk_mask = arr_topk_mask[_bidx]
# --
cur_ok_mask = np.copy(aslice_input_mask_t)
cur_budget = aslice_topk_t.item()
for _cidx in aslice_sorted_idxes_t:
_cidx = _cidx.item()
if cur_budget <= 0: break # no budget left
if not aslice_mask_t[_cidx].item(): continue # non-valid candidate
one_widx, one_wlen = aslice_widx_t[_cidx].item(
), aslice_wlen_t[_cidx].item()
if np.prod(cur_ok_mask[one_widx:one_widx +
one_wlen]).item() == 0.: # any hit one?
continue
# ok! add it!
cur_budget -= 1
cur_ok_mask[one_widx:one_widx + one_wlen] = 0.
aslice_topk_mask[_cidx] = 1.
_bidx += 1
# note: no need to *=mask_t again since already check in the loop
return BK.input_real(arr_topk_mask).reshape(score_shape)
def _aggregate_subtoks(self, repr_t: BK.Expr, dsel_seq_info):
conf: DSelectorConf = self.conf
_arange_t, _sel_t, _len_t = dsel_seq_info.arange2_t, dsel_seq_info.dec_sel_idxes, dsel_seq_info.dec_sel_lens
_max_len = 1 if BK.is_zero_shape(_len_t) else _len_t.max().item()
_max_len = max(1, min(conf.dsel_max_subtoks, _max_len)) # truncate
# --
_tmp_arange_t = BK.arange_idx(_max_len) # [M]
_all_valids_t = (_tmp_arange_t < _len_t.unsqueeze(-1)).float() # [*, dlen, M]
_tmp_arange_t = _tmp_arange_t * _all_valids_t.long() # note: pad as 0
_all_idxes_t = _sel_t.unsqueeze(-1) + _tmp_arange_t # [*, dlen, M]
_all_repr_t = repr_t[_arange_t.unsqueeze(-1), _all_idxes_t] # [*, dlen, M, D]
while len(BK.get_shape(_all_valids_t)) < len(BK.get_shape(_all_repr_t)):
_all_valids_t = _all_valids_t.unsqueeze(-1)
_all_repr_t = _all_repr_t * _all_valids_t
return _all_repr_t, _all_valids_t
def select_topk(score_t: BK.Expr,
topk_t: Union[int, BK.Expr],
mask_t: BK.Expr = None,
dim=-1):
# prepare K
if isinstance(topk_t, int):
K = topk_t
tmp_shape = BK.get_shape(score_t)
tmp_shape[dim] = 1 # set it as 1
topk_t = BK.constants_idx(tmp_shape, K)
else:
K = topk_t.max().item()
exact_rank_t = topk_t - 1 # [bsize, 1]
exact_rank_t.clamp_(min=0, max=K - 1) # make it in valid range!
# mask values
if mask_t is not None:
score_t = score_t + Constants.REAL_PRAC_MIN * (1. - mask_t)
# topk
topk_vals, _ = score_t.topk(K, dim, largest=True, sorted=True) # [*, K, *]
# gather score
sel_thresh = topk_vals.gather(dim, exact_rank_t) # [*, 1, *]
# get topk_mask
topk_mask = (score_t >= sel_thresh).float() # [*, D, *]
if mask_t is not None:
topk_mask *= mask_t
return topk_mask
def loss(self,
insts: Union[List[Sent], List[Frame]],
input_expr: BK.Expr,
mask_expr: BK.Expr,
pair_expr: BK.Expr = None,
lookup_flatten=False,
external_extra_score: BK.Expr = None):
conf: SeqExtractorConf = self.conf
# step 0: prepare golds
expr_gold_slabs, expr_loss_weight_non = self.helper.prepare(
insts, mlen=BK.get_shape(mask_expr, -1), use_cache=True)
final_loss_weights = BK.where(
expr_gold_slabs == 0,
expr_loss_weight_non.unsqueeze(-1) * conf.loss_weight_non,
mask_expr)
# step 1: label; with special weights
loss_lab, loss_count = self.lab_node.loss(
input_expr,
pair_expr,
mask_expr,
expr_gold_slabs,
loss_weight_expr=final_loss_weights,
extra_score=external_extra_score)
loss_lab_item = LossHelper.compile_leaf_loss(
f"lab",
loss_lab,
loss_count,
loss_lambda=conf.loss_lab,
gold=(expr_gold_slabs > 0).float().sum())
# ==
# return loss
ret_loss = LossHelper.combine_multiple_losses([loss_lab_item])
return self._finish_loss(ret_loss, insts, input_expr, mask_expr,
pair_expr, lookup_flatten)
def inference_forward(scores_t: BK.Expr,
mat_t: BK.Expr,
mask_t: BK.Expr,
beam_k: int = 0):
scores_shape = BK.get_shape(scores_t) # [*, slen, L]
need_topk = (beam_k > 0) and (beam_k < scores_shape[-1]
) # whether we need topk
# --
score_slices = split_at_dim(scores_t, -2, True) # List[*, 1, L]
mask_slices = split_at_dim(mask_t, -1, True) # List[*, 1]
# the loop on slen
start_shape = scores_shape[:-2] + [1] # [*, 1]
last_labs_t = BK.constants_idx(start_shape,
0) # [*, K], todo(note): start with 0!
last_accu_scores = BK.zeros(start_shape) # accumulated scores: [*, K]
last_potential = BK.zeros(
start_shape) # accumulated potentials: [*, K]
full_labs_t = BK.arange_idx(scores_shape[-1]).view(
[1] * (len(scores_shape) - 2) + [-1]) # [*, L]
cur_step = 0
for one_score_slice, one_mask_slice in zip(score_slices,
mask_slices): # [*,L],[*,1]
one_mask_slice_neg = 1. - one_mask_slice # [*,1]
# get current scores
if cur_step == 0: # no transition at start!
one_cur_scores = one_score_slice # [*, 1, L]
else:
one_cur_scores = one_score_slice + mat_t[
last_labs_t] # [*, K, L]
# first for potentials
expanded_potentials = last_potential.unsqueeze(
-1) + one_cur_scores # [*, K, L]
merged_potentials = log_sum_exp(expanded_potentials, -2) # [*, L]
# optional for topk with merging; note: not really topk!!
if need_topk:
# todo(+W): another option is to directly select with potentials rather than accu_scores
expanded_scores = last_accu_scores.unsqueeze(
-1) + one_cur_scores # [*, K, L]
# max at -2, merge same current label
max_scores, max_idxes = expanded_scores.max(-2) # [*, L]
# topk at current step, no need to sort!
new_accu_scores, new_labs_t = max_scores.topk(
beam_k, -1, sorted=False) # [*, K]
new_potential = merged_potentials.gather(-1,
new_labs_t) # [*, K]
# mask and update
last_potential = last_potential * one_mask_slice_neg + new_potential * one_mask_slice # [*, K]
last_accu_scores = last_accu_scores * one_mask_slice_neg + new_accu_scores * one_mask_slice # [*, K]
last_labs_t = last_labs_t * one_mask_slice_neg.long(
) + new_labs_t * one_mask_slice.long() # [*, K]
else:
# mask and update
last_potential = last_potential * one_mask_slice_neg + merged_potentials * one_mask_slice # [*, L(K)]
# note: still need to mask this!
last_labs_t = last_labs_t * one_mask_slice_neg.long(
) + full_labs_t * one_mask_slice.long()
cur_step += 1
# finally sum all
ret_potential = log_sum_exp(last_potential, -1) # [*]
return ret_potential
def predict(self,
insts: Union[List[Sent], List[Frame]],
input_expr: BK.Expr,
mask_expr: BK.Expr,
pair_expr: BK.Expr = None,
lookup_flatten=False,
external_extra_score: BK.Expr = None):
conf: AnchorExtractorConf = self.conf
assert not lookup_flatten
bsize, slen = BK.get_shape(mask_expr)
# --
for inst in insts: # first clear things
self.helper._clear_f(inst)
# --
# step 1: simply labeling!
best_labs, best_scores = self.lab_node.predict(
input_expr, pair_expr, mask_expr, extra_score=external_extra_score)
flt_items = self.helper.put_results(insts, best_labs,
best_scores) # [?]
# --
# step 2: final extend (in a flattened way)
if len(flt_items) > 0 and conf.pred_ext:
flt_mask = ((best_labs > 0) & (mask_expr > 0)) # [*, slen]
flt_sidx = BK.arange_idx(bsize).unsqueeze(-1).expand_as(flt_mask)[
flt_mask] # [?]
flt_expr = input_expr[flt_mask] # [?, D]
flt_full_expr = self._prepare_full_expr(flt_mask) # [?, slen, D]
self.ext_node.predict(flt_items, input_expr[flt_sidx], flt_expr,
flt_full_expr, mask_expr[flt_sidx])
# --
# extra:
self.pp_node.prune(insts)
return None
def forward(self,
expr_t: BK.Expr,
mask_t: BK.Expr,
scores_t=None,
**kwargs):
conf: IdecConnectorAttConf = self.conf
# --
# prepare input
_d_bs, _dq, _dk, _d_nl, _d_nh = BK.get_shape(scores_t)
in1_t = scores_t[:, :, :, self.lstart:, :self.head_end].reshape(
[_d_bs, _dq, _dk, self.d_in]) # [*, lenq, lenk, din]
in2_t = in1_t.transpose(-3, -2) # [*, lenk, lenq, din]
final_input_t = BK.concat([in1_t, in2_t], -1) # [*, lenk, lenq, din*2]
# forward
node_ret_t = self.node.forward(final_input_t, mask_t, self.feed_output,
self.lidx,
**kwargs) # [*, lenq, lenk, head_end]
if self.feed_output:
# pad zeros if necessary
if self.head_end < _d_nh:
pad_t = BK.zeros([_d_bs, _dq, _dk, _d_nh - self.head_end])
node_ret_t = BK.concat([node_ret_t, pad_t],
-3) # [*, lenq, lenk, Hin]
return node_ret_t
else:
return None
def _get_extra_score(self, cand_score, insts, cand_res, arr_gold_items, use_cons: bool, use_lu: bool):
# conf: DirectExtractorConf = self.conf
# --
# first cand score
cand_score = self._extend_cand_score(cand_score)
# then cons_lex score
cons_lex_node = self.cons_lex_node
if use_cons and cons_lex_node is not None:
cons_lex = cons_lex_node.cons
flt_arr_gold_items = arr_gold_items.flatten()
_shape = BK.get_shape(cand_res.mask_expr)
if cand_res.gaddr_expr is None:
gaddr_expr = BK.constants(_shape, -1, dtype=BK.long)
else:
gaddr_expr = cand_res.gaddr_expr
all_arrs = [BK.get_value(z) for z in [cand_res.widx_expr, cand_res.wlen_expr, cand_res.mask_expr, gaddr_expr]]
arr_feats = np.full(_shape, None, dtype=object)
for bidx, inst in enumerate(insts):
one_arr_feats = arr_feats[bidx]
_ii = -1
for one_widx, one_wlen, one_mask, one_gaddr in zip(*[z[bidx] for z in all_arrs]):
_ii += 1
if one_mask == 0.: continue # skip invlaid ones
if use_lu and one_gaddr>=0:
one_feat = cons_lex.lu2feat(flt_arr_gold_items[one_gaddr].info["luName"])
else:
one_feat = cons_lex.span2feat(inst, one_widx, one_wlen)
one_arr_feats[_ii] = one_feat
cons_valids = cons_lex_node.lookup_with_feats(arr_feats)
cons_score = (1.-cons_valids) * Constants.REAL_PRAC_MIN
else:
cons_score = None
# sum
return self._sum_scores(cand_score, cons_score)
def go_feed(self, cache: TransformerDecCache, input_expr: BK.Expr, mask_expr: BK.Expr = None):
conf: TransformerConf = self.conf
n_layers = conf.n_layers
# --
if n_layers == 0: # only add the input
cache.update([input_expr], mask_expr) # one call of update is enough
return input_expr # change nothing
# --
# first prepare inputs
input_shape = BK.get_shape(input_expr) # [bsize, ssize, D]
bsize, ssize = input_shape[:2]
cache.s0_open_new_steps(bsize, ssize, mask_expr) # open one
# --
if conf.use_posi:
positions = cache.positions[:, -ssize:] # [*, step]
posi_embed = self.PE(positions)
input_emb = self.input_f(input_expr+posi_embed) # add absolute positional embeddings
else:
input_emb = self.input_f(input_expr) # process input, [*, step, D]
cur_q, cur_kv = cache.ss_add_new_layer(0, input_emb)
# --
# prepare rposi and casual-mask
all_posi = cache.positions # [*, old+new]
rposi = all_posi[:, -ssize:].unsqueeze(-1) - all_posi.unsqueeze(-2) # Q-KV [*, new(query), new+old(kv)]
mask_qk = (rposi>=0).float() # q must be later than kv
# go!
for ti, tnode in enumerate(self.tnodes):
cur_q = tnode(cur_q, cur_kv, cache.mask, mask_qk, rposi=rposi)
cur_q, cur_kv = cache.ss_add_new_layer(ti+1, cur_q) # kv for next layer
cache.sz_close()
return cur_q # [*, ssize, D]
def _prepare_full_expr(self, flt_mask: BK.Expr):
bsize, slen = BK.get_shape(flt_mask)
arange2_t = BK.arange_idx(slen).unsqueeze(0) # [1, slen]
all_widxes = arange2_t.expand_as(flt_mask)[flt_mask] # [?]
tmp_idxes = BK.zeros([len(all_widxes), slen]).long() # [?, slen]
tmp_idxes.scatter_(-1, all_widxes.unsqueeze(-1), 1) # [?, slen]
tmp_embs = self.indicator_embed(tmp_idxes) # [?, slen, D]
return tmp_embs
def get_batched_features(items: np.ndarray, df_val: Union[int, float], attr_f: Union[str, Callable], dtype=None):
if isinstance(attr_f, str):
_local_attr_str = str(attr_f)
attr_f = lambda x: getattr(x, _local_attr_str)
# --
flattened_vals = BK.input_tensor([df_val if z is None else attr_f(z) for z in items.flatten()], dtype=dtype)
ret = flattened_vals.view(BK.get_shape(items))
return ret
def flatten_results(arr_items: np.ndarray, mask_expr: BK.Expr, *other_exprs: BK.Expr):
sel_mask_expr = (mask_expr > 0.)
# flatten first dims
ret_items = [z for z in arr_items.flatten() if z is not None]
ret_other_exprs = [z[sel_mask_expr] for z in other_exprs] # [?(flat), D]
ret_sidx = BK.arange_idx(BK.get_shape(mask_expr, 0)).unsqueeze(-1).expand_as(sel_mask_expr)[sel_mask_expr]
assert all(len(ret_items) == len(z) for z in ret_other_exprs), "Error: dim0 not matched after flatten!"
return ret_items, ret_sidx, *ret_other_exprs # [?(flat), *]
def __init__(self, model: SeqLabelerNode, expr_main: BK.Expr,
expr_pair: BK.Expr, input_mask: BK.Expr,
extra_score: BK.Expr):
self.model = model
self.all_steps = BK.get_shape(expr_main, -2) # slen
# --
# store them
self.expr_main, self.expr_pair, self.input_mask, self.extra_score = expr_main, expr_pair, input_mask, extra_score
# currently we only need repeat 1 & k
self.contents: List[ZObject] = [None] * 1000 # this should be enough!
def _ensure_margins_norm(marginals_expr):
full_shape = BK.get_shape(marginals_expr)
combined_marginals_expr = marginals_expr.view(full_shape[:-2] + [-1]) # [BS, Len, Len*L]
# should be 1., but for no-solution situation there can be small values (+1 for all in this case, norm later)
# make 0./0. = 0.
combined_marginals_sum = combined_marginals_expr.sum(dim=-1, keepdim=True)
combined_marginals_sum += (combined_marginals_sum < 1e-5).float() * 1e-5
# then norm
combined_marginals_expr /= combined_marginals_sum
return combined_marginals_expr.view(full_shape)
def _loss_feed_split(self, mask_expr, split_scores, pred_split_decisions,
cand_widxes, cand_masks, cand_expr, cand_scores,
expr_seq_gaddr):
conf: SoftExtractorConf = self.conf
bsize, slen = BK.get_shape(mask_expr)
arange2_t = BK.arange_idx(bsize).unsqueeze(-1) # [*, 1, 1]
# --
# step 2.1: split loss (only on good points (excluding -1|-1 or paddings) with dynamic oracle)
cand_gaddr = expr_seq_gaddr[arange2_t, cand_widxes] # [*, clen]
cand_gaddr0, cand_gaddr1 = cand_gaddr[:, :
-1], cand_gaddr[:,
1:] # [*, clen-1]
split_oracle = (cand_gaddr0 !=
cand_gaddr1).float() * cand_masks[:, 1:] # [*, clen-1]
split_oracle_mask = (
(cand_gaddr0 >= 0) |
(cand_gaddr1 >= 0)).float() * cand_masks[:, 1:] # [*, clen-1]
raw_split_loss = BK.loss_binary(
split_scores,
split_oracle,
label_smoothing=conf.split_label_smoothing) # [*, slen]
loss_split_item = LossHelper.compile_leaf_loss(
f"split", (raw_split_loss * split_oracle_mask).sum(),
split_oracle_mask.sum(),
loss_lambda=conf.loss_split)
# step 2.2: feed split
# note: when teacher-forcing, only forcing good points, others still use pred
force_split_decisions = split_oracle_mask * split_oracle + (
1. - split_oracle_mask) * pred_split_decisions # [*, clen-1]
_use_force_mask = (BK.rand([bsize])
<= conf.split_feed_force_rate).float().unsqueeze(
-1) # [*, 1], seq-level
feed_split_decisions = (_use_force_mask * force_split_decisions +
(1. - _use_force_mask) * pred_split_decisions
) # [*, clen-1]
# next
# *[*, seglen, MW], [*, seglen]
seg_ext_cidxes, seg_ext_masks, seg_masks = self._split_extend(
feed_split_decisions, cand_masks)
seg_ext_scores, seg_ext_cidxes, seg_ext_widxes, seg_ext_masks, seg_weighted_expr = self._split_aggregate(
cand_expr, cand_scores, cand_widxes, seg_ext_cidxes, seg_ext_masks,
conf.split_topk) # [*, seglen, ?]
# finally get oracles for next steps
# todo(+N): simply select the highest scored one as oracle
if BK.is_zero_shape(seg_ext_scores): # simply make them all -1
oracle_gaddr = BK.constants_idx(seg_masks.shape, -1) # [*, seglen]
else:
_, _seg_max_t = seg_ext_scores.max(-1,
keepdim=True) # [*, seglen, 1]
oracle_widxes = seg_ext_widxes.gather(-1, _seg_max_t).squeeze(
-1) # [*, seglen]
oracle_gaddr = expr_seq_gaddr.gather(-1,
oracle_widxes) # [*, seglen]
oracle_gaddr[seg_masks <= 0] = -1 # (assign invalid ones) [*, seglen]
return loss_split_item, seg_masks, seg_ext_widxes, seg_ext_masks, seg_weighted_expr, oracle_gaddr
def loss(self, insts: List[Sent], input_expr: BK.Expr, mask_expr: BK.Expr):
conf: MySRLConf = self.conf
# --
slen = BK.get_shape(mask_expr, -1)
arr_items, expr_evt_labels, expr_arg_labels, expr_loss_weight_non = self.helper.prepare(insts, True)
if conf.binary_evt:
expr_evt_labels = (expr_evt_labels>0).long() # either 0 or 1
loss_items = []
# =====
# evt
# -- prepare weights and masks
evt_not_nil = (expr_evt_labels>0) # [*, slen]
evt_extra_weights = BK.where(evt_not_nil, mask_expr, expr_loss_weight_non.unsqueeze(-1)*conf.evt_loss_weight_non)
evt_weights = self._prepare_loss_weights(mask_expr, evt_not_nil, conf.evt_loss_sample_neg, evt_extra_weights)
# -- get losses
_, all_evt_cfs, all_evt_scores = self.evt_node.get_all_values() # [*, slen]
all_evt_losses = []
for one_evt_scores in all_evt_scores:
one_losses = BK.loss_nll(one_evt_scores, expr_evt_labels, label_smoothing=conf.evt_label_smoothing)
all_evt_losses.append(one_losses)
evt_loss_results = self.evt_node.helper.loss(all_losses=all_evt_losses, all_cfs=all_evt_cfs)
for loss_t, loss_alpha, loss_name in evt_loss_results:
one_evt_item = LossHelper.compile_leaf_loss("evt"+loss_name, (loss_t*evt_weights).sum(), evt_weights.sum(),
loss_lambda=conf.loss_evt*loss_alpha, gold=evt_not_nil.float().sum())
loss_items.append(one_evt_item)
# =====
# arg
_arg_loss_evt_sample_neg = conf.arg_loss_evt_sample_neg
if _arg_loss_evt_sample_neg > 0:
arg_evt_masks = ((BK.rand(mask_expr.shape)<_arg_loss_evt_sample_neg) | evt_not_nil).float() * mask_expr
else:
arg_evt_masks = evt_not_nil.float() # [*, slen]
# expand/flat the dims
arg_flat_mask = (arg_evt_masks > 0) # [*, slen]
flat_mask_expr = mask_expr.unsqueeze(-2).expand(-1, slen, slen)[arg_flat_mask] # [*, 1->slen, slen] => [??, slen]
flat_arg_labels = expr_arg_labels[arg_flat_mask] # [??, slen]
flat_arg_not_nil = (flat_arg_labels > 0) # [??, slen]
flat_arg_weights = self._prepare_loss_weights(flat_mask_expr, flat_arg_not_nil, conf.arg_loss_sample_neg)
# -- get losses
_, all_arg_cfs, all_arg_scores = self.arg_node.get_all_values() # [*, slen, slen]
all_arg_losses = []
for one_arg_scores in all_arg_scores:
one_flat_arg_scores = one_arg_scores[arg_flat_mask] # [??, slen]
one_losses = BK.loss_nll(one_flat_arg_scores, flat_arg_labels, label_smoothing=conf.evt_label_smoothing)
all_arg_losses.append(one_losses)
all_arg_cfs = [z[arg_flat_mask] for z in all_arg_cfs] # [??, slen]
arg_loss_results = self.arg_node.helper.loss(all_losses=all_arg_losses, all_cfs=all_arg_cfs)
for loss_t, loss_alpha, loss_name in arg_loss_results:
one_arg_item = LossHelper.compile_leaf_loss("arg"+loss_name, (loss_t*flat_arg_weights).sum(), flat_arg_weights.sum(),
loss_lambda=conf.loss_arg*loss_alpha, gold=flat_arg_not_nil.float().sum())
loss_items.append(one_arg_item)
# =====
# return loss
ret_loss = LossHelper.combine_multiple_losses(loss_items)
return ret_loss
def decode_frame_given(self, ibatch, scores_t: BK.Expr,
pred_max_layer: int, voc, pred_label: bool,
pred_tag: str, assume_osof: bool):
if pred_label: # if overwrite label!
logprobs_t = scores_t.log_softmax(-1) # [*, dlen, L]
pred_scores, pred_labels = logprobs_t.max(
-1) # [*, dlen], note: maximum!
arr_scores, arr_labels = BK.get_value(pred_scores), BK.get_value(
pred_labels) # [*, dlen]
else:
arr_scores = arr_labels = None
# --
# read given results
res_bidxes, res_widxes, res_frames = [], [], [] # flattened results
tmp_farrs = defaultdict(list) # later assign
for bidx, item in enumerate(
ibatch.items): # for each item in the batch
_trg_frames = [item.inst] if assume_osof else \
sum([sent.get_frames(pred_tag) for sidx,sent in enumerate(item.sents)
if (item.center_sidx is None or sidx == item.center_sidx)],[]) # still only pick center ones!
# --
_dec_offsets = item.seq_info.dec_offsets
for _frame in _trg_frames: # note: simply sort by original order!
sidx = item.sents.index(_frame.sent)
_start = _dec_offsets[sidx]
_full_hidx = _start + _frame.mention.shead_widx
# add new one
res_bidxes.append(bidx)
res_widxes.append(_full_hidx)
_frame._tmp_sstart = _start # todo(+N): ugly tmp value ...
_frame._tmp_sidx = sidx
_frame._tmp_item = item
res_frames.append(_frame)
tmp_farrs[(bidx, _full_hidx)].append(_frame)
# assign/rewrite label?
if pred_label:
_lab = int(arr_labels[bidx, _full_hidx]) # label index
_frame.set_label_idx(_lab)
_frame.set_label(voc.idx2word(_lab))
_frame.set_score(float(arr_scores[bidx, _full_hidx]))
# --
# --
res_farrs = np.full(BK.get_shape(scores_t)[:-1] + [pred_max_layer],
None,
dtype=object) # [*, dlen, K]
for _key, _values in tmp_farrs.items():
bidx, widx = _key
_values = _values[:pred_max_layer] # truncate if more!
res_farrs[bidx, widx, :len(_values)] = _values
# return
res_bidxes_t, res_widxes_t = BK.input_idx(res_bidxes), BK.input_idx(
res_widxes) # [??]
return (res_bidxes_t,
res_widxes_t), res_frames, res_farrs # [??], [*, dlen, K]
def get_last_emb(self):
k = "last_emb"
ret = self.l_caches.get(k)
if ret is None:
ret = self.embs[-1]
valid_idxes_t = self.valid_idxes_t
if valid_idxes_t is not None:
arange2_t = BK.arange_idx(BK.get_shape(valid_idxes_t, 0)).unsqueeze(-1) # [bsize, 1]
ret = ret[arange2_t, valid_idxes_t] # select!
self.l_caches[k] = ret # cache
return ret
def get_stack_att(self):
k = "stack_att"
ret = self.l_caches.get(k)
if ret is None:
ret = BK.stack(self.attns, -1).permute(0,2,3,4,1) # NL*[*, H, lenq, lenk] -> [*, lenq, lenk, NL, H]
valid_idxes_t = self.valid_idxes_t
if valid_idxes_t is not None:
arange3_t = BK.arange_idx(BK.get_shape(valid_idxes_t, 0)).unsqueeze(-1).unsqueeze(-1) # [bsize, 1, 1]
ret = ret[arange3_t, valid_idxes_t.unsqueeze(-1), valid_idxes_t.unsqueeze(-2)] # select!
self.l_caches[k] = ret # cache
return ret
def _prepare_full_expr(self, flt_ext_widxes, flt_ext_masks, slen: int):
tmp_bsize = BK.get_shape(flt_ext_widxes, 0)
tmp_idxes = BK.zeros([tmp_bsize, slen + 1]) # [?, slen+1]
# note: (once a bug) should get rid of paddings!!
_mask_lt = flt_ext_masks.long() # [?, N]
tmp_idxes.scatter_(-1,
flt_ext_widxes * _mask_lt + slen * (1 - _mask_lt),
1) # [?, slen]
tmp_idxes = tmp_idxes[:, :-1].long() # [?, slen]
tmp_embs = self.indicator_embed(tmp_idxes) # [?, slen, D]
return tmp_embs
def get_stack_emb(self):
k = "stack_emb"
ret = self.l_caches.get(k)
if ret is None:
# note: excluding embeddings here to make it convenient!!
ret = BK.stack(self.embs[1:], -1) # [*, slen, D, NL]
valid_idxes_t = self.valid_idxes_t
if valid_idxes_t is not None:
arange2_t = BK.arange_idx(BK.get_shape(valid_idxes_t, 0)).unsqueeze(-1) # [bsize, 1]
ret = ret[arange2_t, valid_idxes_t] # select!
self.l_caches[k] = ret # cache
return ret