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Fix init_value and end_value in cosine decay #884

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Fix init_value and end_value in cosine decay #884

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Fix init_value and end_value in cosine decay

Problem:

  • the starting value was not always init_value
  • the last value was not always end_value

Solution:

Misc:
renamed alpha -> end_value in warmup_cosine_decay_schedule

@fabianp
Fix init_value and end_value in cosine decay
cb6cef2 
Problem:
* the starting value was not always init_value
* the last value was not always end_value

Solution:
* changed the formulas (they are now compatible with the pytorch implementation https://pytorch.org/docs/stable/generated/torch.optim.lr_scheduler.CosineAnnealingLR.html)
* added test to check that starting and end value coincide with `init_value` and `end_value` respectively

Misc:
   renamed alpha -> end_value in warmup_cosine_decay_schedule
PiperOrigin-RevId: 619109148
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@fabianp