deepspeed-chat: add end-of-text special token #775
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Stages 1 & 2 append '<|endoftext|>' text marker to all samples. However, some tokenizers (e.g. OPT, Bloom), encode this marker as a sequence of subword tokens and not as a single special token. This commit adds an optional support to add the EOT marker as a special token to force the tokenizer to encode it as a single token. Note that using EOT special token may change the dynamics of stage3 training. Therefore, to be backward compliant, this commit makes it optional. Change-Id: If98d348fcaa7d6685e755aabe305e23e7649c367 Signed-off-by: Moshe Island <misland@habana.ai>
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Stages 1 & 2 append '<|endoftext|>' text marker to all samples. However, some tokenizers (e.g. OPT, Bloom), encode this marker as a sequence of subword tokens and not as a single special token.
This commit adds an optional support to add the EOT marker as a special token to force the tokenizer to encode it as a single token.
Note that using EOT special token may change the dynamics of stage3 training. Therefore, to be backward compliant, this commit makes it optional.
Change-Id: If98d348fcaa7d6685e755aabe305e23e7649c367