fix adamw lr_to_coeff is fixed when dygraph #30526
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PR types
Bug fixes
PR changes
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Describe
Fix bug in #30130
We use
_lr_to_coeffto cache the coeff result. But in dygraph mode, apply_gradient will be executed every step and recompute a new coeff value. So need to clear_lr_to_coeffevery step, otherwise_lr_to_coeffwill be fixed.