fix for matmul_v2 6D x 2D (#36379)

paddle/fluid/operators/mkldnn/matmul_v2_mkldnn_op.cc

@@ -148,8 +148,8 @@ class MatMulV2MKLDNNKernel
     if (x_dims.size() == 1) {
       x_bd_dims[x_bd_dims.size() - 1] = x_dims[0];
     } else if (x_dims.size() == 2) {
-      x_bd_dims[2] = x_dims[1];
-      x_bd_dims[1] = x_dims[0];
+      x_bd_dims[x_bd_dims.size() - 1] = x_dims[1];
+      x_bd_dims[x_bd_dims.size() - 2] = x_dims[0];
     } else {
       for (size_t i = 0; i < x_dims.size(); ++i) {
         x_bd_dims[i] = x_dims[i];
@@ -158,8 +158,8 @@ class MatMulV2MKLDNNKernel
     if (y_dims.size() == 1) {
       y_bd_dims[x_bd_dims.size() - 2] = y_dims[0];
     } else if (y_dims.size() == 2) {
-      y_bd_dims[2] = y_dims[1];
-      y_bd_dims[1] = y_dims[0];
+      y_bd_dims[y_bd_dims.size() - 1] = y_dims[1];
+      y_bd_dims[y_bd_dims.size() - 2] = y_dims[0];
     } else {
       for (size_t i = 0; i < y_dims.size(); ++i) {
         y_bd_dims[i] = y_dims[i];

python/paddle/fluid/tests/unittests/mkldnn/test_matmul_v2_mkldnn_op.py

@@ -235,6 +235,22 @@ class TestMatMulV2MatrixXMatrix5DTranposeYOneDNNOp(
         self.trans_y = True
 
 
+class TestMatMulV2MatrixXMatrix6Dx2DOneDNNOp(TestMatMulV2VectorXVectorOneDNNOp):
+    def config(self):
+        self.x_shape = (1, 1, 2, 1, 8, 9)
+        self.y_shape = (9, 12)
+        self.trans_x = False
+        self.trans_y = False
+
+
+class TestMatMulV2MatrixXMatrix2Dx5DOneDNNOp(TestMatMulV2VectorXVectorOneDNNOp):
+    def config(self):
+        self.x_shape = (20, 5)
+        self.y_shape = (1, 2, 1, 5, 11)
+        self.trans_x = False
+        self.trans_y = False
+
+
 #   BF16 TESTS
 def create_bf16_test_class(parent):
     @OpTestTool.skip_if_not_cpu_bf16()
@@ -274,7 +290,8 @@ def create_bf16_test_class(parent):
                 2: [1, 0],
                 3: [0, 2, 1],
                 4: [0, 1, 3, 2],
-                5: [0, 1, 2, 4, 3]
+                5: [0, 1, 2, 4, 3],
+                6: [0, 1, 2, 3, 5, 4]
             }
 
             # expand vector so it will be a valid matrix for multiplication
@@ -370,6 +387,8 @@ create_bf16_test_class(TestMatMulV2Matrix3DXVectorOneDNNOp)
 create_bf16_test_class(TestMatMulV2MatrixXMatrixTransposeXTransposeYOneDNNOp)
 create_bf16_test_class(TestMatMulV2MatrixXMatrixTransposeY2OneDNNOp)
 create_bf16_test_class(TestMatMulV2MatrixXMatrix5DTranposeYOneDNNOp)
+create_bf16_test_class(TestMatMulV2MatrixXMatrix6Dx2DOneDNNOp)
+create_bf16_test_class(TestMatMulV2MatrixXMatrix2Dx5DOneDNNOp)
 
 if __name__ == "__main__":
     paddle.enable_static()