youkaichao affeec13de Improve Batch (#128)
* minor polish

* improve and implement Batch.cat_

* bugfix for buffer.sample with field impt_weight

* restore the usage of a.cat_(b)

* fix 2 bugs in batch and add corresponding unittest

* code fix for update

* update is_empty to recognize empty over empty; bugfix for len

* bugfix for update and add testcase

* add testcase of update

* fix docs

* fix docs

* fix docs [ci skip]

* fix docs [ci skip]

Co-authored-by: Trinkle23897 <463003665@qq.com>
2020-07-13 17:33:01 +08:00
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