[1.2.0] Fix CTC loss for zero-length targets on GPU (#23298) #23715
+133
−50
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Summary:
Fixes: #18215 at last!
Also sprinkle tests...
Pull Request resolved: #23298
Differential Revision: D16582145
Pulled By: soumith
fbshipit-source-id: bc8b1a629de0c2606e70a2218ccd135f4a9cdc5d