Map batch matmul from PT to TVM.

Also added test.

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Author: kimishpatel

test/test_operators.py

@@ -326,6 +326,20 @@ def linear_no_bias(input, weight):
         ref_out_no_bias, tvm_out_no_bias = self.runBoth(linear_no_bias, input, weight)
         assert torch.allclose(ref_out_no_bias, tvm_out_no_bias, rtol=0.01, atol=0.01)
 
+    @TVMTest.given(
+        shape=TVMTest.rand_shape(rank=3, min_dim=4),
+        out_features=TVMTest.rand_int(3, 6),
+    )
+    def test_bmm(self, shape, out_features):
+        input = torch.rand(shape)
+        weight = torch.rand(shape[0], shape[-1], out_features)
+
+        def bmm(input, weight):
+            return torch.bmm(input, weight) + 2.0
+
+        ref_out, tvm_out = self.runBoth(bmm, input, weight)
+        assert torch.allclose(ref_out, tvm_out, rtol=0.01, atol=0.01)
+
     @TVMTest.given(
         shape=TVMTest.rand_shape(rank=2, min_dim=4),
     )

torch_tvm/operators.cpp

@@ -503,6 +503,26 @@ RegisterTVMOperator reg({
            tvm::relay::CallNode::make(op, {inputs[0]}, tvm::Attrs(attrs), {});
        return out;
      }},
+    {Symbol::fromQualString("aten::bmm"),
+     [](Node* node, tvm::Array<tvm::relay::Expr> inputs) {
+       TORCH_INTERNAL_ASSERT(inputs.size()==2);
+
+       auto transpose_attrs = tvm::make_node<tvm::relay::TransposeAttrs>();
+       auto& axes = transpose_attrs->axes;
+       axes.push_back(0);
+       axes.push_back(2);
+       axes.push_back(1);
+
+       auto transposed_weight = tvm::relay::CallNode::make(
+           tvm::relay::Op::Get("transpose"),
+           {inputs[1]}, tvm::Attrs(transpose_attrs), {});
+
+       auto out = tvm::relay::CallNode::make(
+           tvm::relay::Op::Get("nn.batch_matmul"),
+           {inputs[0], transposed_weight}, {}, {});
+
+       return out;
+     }},
     {Symbol::fromQualString("aten::linear"),
      [](Node* node, tvm::Array<tvm::relay::Expr> inputs) {
        Value* input = node->input(0);