【Hackathon 6th No.9】Update ValidateShape to support zero sized tensor flatten -part #64715
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PaddlePaddle/community#833 (review)
问题:

根据报错信息应该是需要调整unary.cc中的:
static phi::DDim ValidateShape(const std::vector<int64_t> shape, const phi::DDim& in_dims)
如果flatten支持了shape有零的情况,stack也需要支持shape有零的情况