message: Fix UT failure of 'NodeRewrite_BiasAddGrad_Positive1'.
diff: @@ -2284,8 +2284,8 @@ TEST_F(MklLayoutPassTest, NodeRewrite_BiasAddGrad_Positive1) {
  " attr { key: 'data_format' value { s: 'NCHW' } }"
  " input: ['D'] }");
  EXPECT_EQ(DoMklLayoutOptimizationPass(),
  - "A(Input);B(Input);C(MatMul);D(Zeta);E(BiasAddGrad)|"
  - "A->C;A->D:1;B->C:1;C->D;D->E");
  + "A(Input);B(Input);C(_MklMatMul);D(Zeta);E(BiasAddGrad)"
  + "|A->C;A->D:1;B->C:1;C->D;D->E");
  }
  // Check that we never rewrite BiasAddGrad.
  