Merge pull request !25379 from 魏志清/reciprocalgrad

Merge pull request !25445 from wangshuide/wsd_master

Merge pull request !21829 from 孟权令/Cdist

- Allow the J CNode used multiple as non-call input.
- Check recursive J FG including FV J CNode.
- Add grad functional api.

fix example output of avgpool3d.
add note description of dynamicrnn.

From: @shen_jingxing
Reviewed-by: @ginfung,@zh_qh
Signed-off-by: @zh_qh

This reverts commit 3be79efd808f54b6e66fa45f26e601e5a143ae76, reversing
changes made to cf4479756a.

From: @shen_jingxing
Reviewed-by: @ginfung,@zh_qh
Signed-off-by: @zh_qh

From: @simson_wu
Reviewed-by: @ginfung,@zh_qh
Signed-off-by: @zh_qh

From: @liangzhibo
Reviewed-by: @kingxian
Signed-off-by: @kingxian

From: @liu_xiao_93
Reviewed-by: @liangchenghui,@wuxuejian
Signed-off-by: @liangchenghui

From: @liu_xiao_93
Reviewed-by: @liangchenghui
Signed-off-by: @liangchenghui