Fix overwriting FP8 act ckpt flag in the train script #1107
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The current activation checkpointing with FP8 TE requires using the non-reentrant implementation from TE. The fsdp_config for activation checkpointing with TE FP8 is
The activation_checkpointing_reentrant param in yaml get overwritten in the train.py script due to legacy reasons. Need to rewrite the check.