janelu9 commented on issue #13329: problem about lstm_crf URL: https://github.com/apache/incubator-mxnet/issues/13329#issuecomment-443061287 ` def _forward_alg(self, feats): # Do the forward algorithm to compute the partition function alphas = [[0.] * self.tagset_size] alphas[0][self.tag2idx[START_TAG]] = 1 alphas = nd.array(alphas) # Iterate through the sentence for feat in feats: alphas_t = [] # The forward variables at this timestep for next_tag in range(self.tagset_size): emit_score = feat[next_tag].reshape((1, -1)) trans_score = self.transitions.data()[next_tag].reshape((1, -1)) next_tag_var = alphas *nd.exp( trans_score + emit_score) alphas_t.append(nsum(next_tag_var)) alphas = nd.concat(*alphas_t, dim=0).reshape((1, -1)) terminal_var = alphas *nd.exp( self.transitions.data()[self.tag2idx[STOP_TAG]]) alpha = log_sum(terminal_var) return alpha`
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