Error when trying to generate text with sequence sampling

[anirudhacharya]

Encountering the following error when I try to run this sequence sampler example from gluon-nlp toolkit -

Namespace(alpha=0.0, beam_size=2, bos=['I love it'], eos='.', gpu=None, k=5, lm_model='awd_lstm_lm_1150', max_length=20, print_num=1, temperature=1.0, use_beam_search=False, use_sampling=True)
terminate called after throwing an instance of 'std::out_of_range'
  what():  vector::_M_range_check: __n (which is 1) >= this->size() (which is 1)
Aborted (core dumped)

The error was likely introduced in this commit 3f3ba92

cc @reminisce

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