change for paddle2.1

Change-Id: I391dc7eab2d4a12710c38f03ea309cc3ef2f3b17

change version

Change-Id: I7a58030e8d798b38d82f528ebd2648497994fa79

add transformer model

add buckets in parse/parse_seg;

fix bug when using numpy;

change readme

Change-Id: I4f9eba6f1e79db0e456584062c72872fd9a277c4