'DecoderRNN' object has no attribute 'sample_beam'

[wjy3326]

when I run python eval.py with beam_size=2, occur the problem 'DecoderRNN' object has no attribute 'sample_beam'

init COCO-EVAL scorer
Traceback (most recent call last):
File "eval.py", line 122, in
main(opt)
File "eval.py", line 91, in main
test(model, crit, dataset, dataset.get_vocab(), opt)
File "eval.py", line 48, in test
fc_feats, mode='inference', opt=opt)
File "/u01/isi/maxq/envs/scan_envs/lib/python2.7/site-packages/torch/nn/modules/module.py", line 491, in call
result = self.forward(*input, **kwargs)
File "/u01/isi/wangjunyan/video_captioning/video-caption.pytorch/models/S2VTAttModel.py", line 29, in forward
seq_prob, seq_preds = self.decoder(encoder_outputs, encoder_hidden, target_variable, mode, opt)
File "/u01/isi/maxq/envs/scan_envs/lib/python2.7/site-packages/torch/nn/modules/module.py", line 491, in call
result = self.forward(*input, **kwargs)
File "/u01/isi/wangjunyan/video_captioning/video-caption.pytorch/models/DecoderRNN.py", line 109, in forward
return self.sample_beam(encoder_outputs, decoder_hidden, opt)
File "/u01/isi/maxq/envs/scan_envs/lib/python2.7/site-packages/torch/nn/modules/module.py", line 532, in getattr
type(self).name, name))
AttributeError: 'DecoderRNN' object has no attribute 'sample_beam'