“90648f336d0a73630d0a862259a4f73ab3c9fe8c”上不存在“paddle/phi/kernels/is_empty_kernel.cc”
* Add DataFeeder A v2 API like data feeder for book demos. We can feed data directly from reader. * Fix CI * Add an unittest for while/rnn op forward * Add unittest for raw while op backward * Fix CI