def expand_ranged_idxes(widx_t: BK.Expr,
wlen_t: BK.Expr,
pad: int = 0,
max_width: int = None):
if max_width is None: # if not provided
if BK.is_zero_shape(wlen_t):
max_width = 1 # at least one
else:
max_width = wlen_t.max().item() # overall max width
# --
input_shape = BK.get_shape(widx_t) # [*]
mw_range_t = BK.arange_idx(max_width).view([1] * len(input_shape) +
[-1]) # [*, MW]
expanded_idxes = widx_t.unsqueeze(-1) + mw_range_t # [*, MW]
expanded_masks_bool = (mw_range_t < wlen_t.unsqueeze(-1)) # [*, MW]
expanded_idxes.masked_fill_(~expanded_masks_bool, pad) # [*, MW]
return expanded_idxes, expanded_masks_bool.float()
def decode_upos(self, ibatch, logprobs_t: BK.Expr):
conf: ZDecoderUposConf = self.conf
# get argmax label!
pred_upos_scores, pred_upos_labels = logprobs_t.max(-1) # [*, dlen]
# arr_upos_scores, arr_upos_labels = BK.get_value(pred_upos_scores), BK.get_value(pred_upos_labels)
arr_upos_labels = BK.get_value(pred_upos_labels)
# put results
voc = self.voc
for bidx, item in enumerate(
ibatch.items): # for each item in the batch
_dec_offsets = item.seq_info.dec_offsets
for sidx, sent in enumerate(item.sents):
if conf.msent_pred_center and (sidx != item.center_sidx):
continue # skip non-center sent in this mode!
_start = _dec_offsets[sidx]
_len = len(sent)
_upos_idxes = arr_upos_labels[bidx][_start:_start +
_len].tolist()
_upos_labels = voc.seq_idx2word(_upos_idxes)
sent.build_uposes(_upos_labels)
def log_sum_exp(t: BK.Expr, dim: int, t_max: BK.Expr = None):
if t_max is None:
t_max, _ = t.max(dim) # get maximum value; [*, *]
ret = t_max + (t - t_max.unsqueeze(dim)).exp().sum(dim).log() # [*, *]
return ret
