From a5167ce0b4116db4c93d7bbd5a2364f5da9b8f63 Mon Sep 17 00:00:00 2001
From: kexinzhao <19hskevin87@gmail.com>
Date: Tue, 5 Dec 2017 16:38:04 -0800
Subject: [PATCH] fix lod_array_lengh op equation (#6307)

---
 paddle/operators/lod_array_length_op.cc | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/paddle/operators/lod_array_length_op.cc b/paddle/operators/lod_array_length_op.cc
index 80445eb5757..b2f4ec57fad 100644
--- a/paddle/operators/lod_array_length_op.cc
+++ b/paddle/operators/lod_array_length_op.cc
@@ -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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