Add ConditionalBlockGradInferVarType for cond_op #39585
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Aurelius84 force-pushed the fix_framework branch from dccf95d to 1d9339b Compare 
phlrain approved these changes Feb 16, 2022
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Bug fixes
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Describe
修复了Cond_Grad_op当Input包含LoDTensorArray类型，且Input@GRAD存在时，编译期组网报错的问题。由于之前缺失了ConditionalBlockGradInferVarType，在backward.py的append_backward_vars时会默认标记Input@GRAD的所有类型均为Tensor类型，即会错误地把LoDTensorArray类型Variable变成Tensor，导致下游Op.infer_var_type时报错。