tensor.size to tensor.shape

* can do frames, real stft

* format

* stft complex, powspec, magspec

* add common utils

* add window process func

* using frames and matmul as stft

* read with 2d; window process

* test with dither, remove dc offset, preermphs

* add doc string

* more frontend utils

* add logspec

* fix typing

* add delpoy mergify label

support benchmark scripts 

Benchmark

add op profiling

do not set seed since break model covergence, aishell s0 seed 10086 test ok

Doc 修正了一些小问题

more doc for egs

u2 with chianer updater

fix norm_by_batchsize

more ctc config