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fix lod_array_lengh op equation #6307

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Dec 6, 2017
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fix lod_array_lengh op equation #6307

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8 changes: 6 additions & 2 deletions paddle/operators/lod_array_length_op.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -43,12 +43,16 @@ class LoDArrayLengthProtoMaker : public framework::OpProtoAndCheckerMaker {
: OpProtoAndCheckerMaker(proto, op_checker) {
AddInput("X", "(LoDTensorArray) The input tensor array.");
AddOutput("Out", "(Tensor) 1x1 CPU Tensor of length, int64_t");
AddComment(R"DOC(Get the length of lod tensor array
AddComment(R"DOC(
LoDArrayLength Operator.

Out = len(X)
This operator obtains the length of lod tensor array:

$$Out = len(X)$$

NOTE: The output is a CPU Tensor since the control variable should be only in
CPU and the length of LoDTensorArray should be used as control variables.

)DOC");
}
};
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