Fix the gold index issue in fetching logprob #11
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add code sample to evaluate PPL
fix the gold index issue
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In story generation task, the original code fetches incorrect index of "logprob", leading to incorrect perplexity evaluation.
Originally:
tgt_in = tgt[:-1]
log_probs, attn = ...
...
gold = tgt_in
Edited:
tgt_in = tgt[:-1]
log_probs, attn = ...
...
gold = tgt[1:]