* add pruned-rnnt2 recipe for alimeeting dataset
* update code for merging
* change LilcomHdf5Writer to ChunkedLilcomHdf5Writer
* change for test.yml
* change for test.yml
* change for test.yml
* change for workflow yml
* change for yml
* change for yml
* change for README.md
* change for yml
* solve the conflicts
* solve the conflicts
* Disable weight decay.
* Remove input feature batchnorm..
* Replace BatchNorm in the Conformer model with LayerNorm.
* Use tanh in the joint network.
* Remove sos ID.
* Reduce the number of decoder layers from 4 to 2.
* Minor fixes.
* Fix typos.