0 index anime

[MRamazan]

in dataset/base.py file, this line: smap = {s: i for i, s in enumerate(set(df['sid']))}

should be changed to: smap = {s: i + 1 for i, s in enumerate(set(df['sid']))}

because enumerate starts from 0 and bert model ignores 0. 0 indexed anime will be considered from the padded part of the vector and will be ignored. to avoid that, we should start from index 1.