“2d16d69b5f06cbd00fafe42f71d47328c9b8a7f4”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 * Complete Dynamic RNN