"op name"

paddle/operators/name_convention.md

+## Operator Name Convention
+
+To make the operator document itself more clear. we recommend operator names observe the listing conventions.
+
+### Input/Output names
+
+Variable name is uppercase. e.g. `X`, `Y`
+
+Tensor name is lowercase. e.g. `tensor`
+
+if only have one output, use `Out`