optimize code

Author: jacquesqiao

paddle/fluid/framework/selected_rows.cc

@@ -70,7 +70,7 @@ struct TensorFillVisitor {
 
   template <typename T>
   void apply() const {
-    // TODO(Yancey1989): support other place
+    // TODO(qiao): support other place
     platform::CPUPlace cpu;
     auto* tensor_data = dst_->mutable_data<T>(cpu);
     auto* start = tensor_data + dst_offset_;

paddle/fluid/operators/lookup_sparse_table_op.cc

@@ -94,7 +94,7 @@ class LookupSparseTableOpMaker : public framework::OpProtoAndCheckerMaker {
         .SetDefault(true);
     AddAttr<bool>("is_test",
                   "In test mode, lookup_sparse_table will "
-                  "return a default value for unknown id")
+                  "return a 0 for unknown id")
         .SetDefault(false);
     AddComment(R"DOC(
 Lookup Sprase Tablel Operator.