IndexError:

[feixiangqiqi]

Traceback (most recent call last):
File "scripts/sample_speaker.py", line 88, in
captions_predicted, attn_weights = versatile_caption_sampler(speaker, annotate_loader, device, **config)
File "../artemis/captioning/sample_captions.py", line 35, in versatile_caption_sampler
drop_bigrams=drop_bigrams)
File "/usr/local/lib/python3.6/dist-packages/torch/autograd/grad_mode.py", line 27, in decorate_context
return func(*args, **kwargs)
File "../artemis/neural_models/attentive_decoder.py", line 586, in sample_captions_beam_search
seqs = torch.cat([seqs[prev_word_inds], next_word_inds.unsqueeze(1)], dim=1) # (s, step+1)
IndexError: tensors used as indices must be long, byte or bool tensors

When run sample_speaker.py, there is a mistake. Can you advise what I'm doing wrong here? Thanks!