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"""
Constants for seq2seq models.
"""
PAD = '<PAD>'
PAD_ID = 0
UNK = '<UNK>'
UNK_ID = 1
SOS = '<SOS>'
SOS_ID = 2
EOS = '<EOS>'
EOS_ID = 3
VOCAB_PREFIX = [PAD, UNK, SOS, EOS]
EMB_INIT_RANGE = 1.0
INFINITY_NUMBER = 1e12
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