[dynamo/converter] support neg converter

Author: bowang007

py/torch_tensorrt/dynamo/conversion/aten_ops_converters.py

@@ -353,6 +353,27 @@ def aten_ops_rsqrt(
         args[0],
     )
 
+@dynamo_tensorrt_converter(torch.ops.aten.neg.default)
+def aten_ops_neg(
+    network: TRTNetwork,
+    target: Target,
+    args: Tuple[Argument, ...],
+    kwargs: Dict[str, Argument],
+    name: str,
+) -> Union[TRTTensor, Sequence[TRTTensor]]:
+    input_val = args[0]
+    if (isinstance(input_val, TRTTensor)) and (
+        input_val.dtype == trt.int8 or input_val.dtype == trt.int32
+    ):
+        input_val = cast_trt_tensor(network, input_val, trt.float32, name)
+
+    return impl.unary.neg(
+        network,
+        target,
+        SourceIR.ATEN,
+        name,
+        input_val,
+    )
 
 @dynamo_tensorrt_converter(torch.ops.aten.squeeze.dim)  # type: ignore[misc]
 @dynamo_tensorrt_converter(torch.ops.aten.squeeze.dims)  # type: ignore[misc]

py/torch_tensorrt/dynamo/conversion/impl/unary/ops.py

@@ -384,3 +384,15 @@ def isinf(
     return convert_unary(
         network, target, source_ir, name, trt.UnaryOperation.ISINF, input_val
     )
+
+
+def neg(
+    network: TRTNetwork,
+    target: Target,
+    source_ir: Optional[SourceIR],
+    name: str,
+    input_val: TRTTensor,
+) -> TRTTensor:
+    return convert_unary(
+        network, target, source_ir, name, trt.UnaryOperation.NEG, input_val
+    )

tests/py/dynamo/converters/test_neg_aten.py

@@ -0,0 +1,52 @@
+import torch
+import torch.nn as nn
+from parameterized import parameterized
+from torch.testing._internal.common_utils import run_tests
+from torch_tensorrt.dynamo.test_utils import DispatchTestCase
+from torch_tensorrt import Input
+
+
+class TestNegConverter(DispatchTestCase):
+    @parameterized.expand(
+        [
+            ("2d_dim_dtype_float", (2, 2), torch.float),
+            ("3d_dim_dtype_float", (2, 2, 2), torch.float),
+            ("2d_dim_dtype_half", (2, 2), torch.half),
+            ("3d_dim_dtype_half", (2, 2, 2), torch.half),
+        ]
+    )
+    def test_neg_float(self, _, x, type):
+        class neg(nn.Module):
+            def forward(self, input):
+                return torch.neg(input)
+
+        inputs = [torch.randn(x, dtype=type)]
+        self.run_test(
+            neg(),
+            inputs,
+            precision=type,
+            expected_ops={torch.ops.aten.neg.default},
+        )
+
+    @parameterized.expand(
+        [
+            ("2d_dim_dtype_int32", (2, 2), torch.int32, 0, 5),
+            ("3d_dim_dtype_int32", (2, 2, 2), torch.int32, 0, 5),
+        ]
+    )
+    def test_neg_int(self, _, x, type, min, max):
+        class neg(nn.Module):
+            def forward(self, input):
+                return torch.neg(input)
+
+        inputs = [torch.randint(min, max, x, dtype=type)]
+        self.run_test(
+            neg(),
+            inputs,
+            output_dtypes=[torch.int32],
+            expected_ops={torch.ops.aten.neg.default},
+        )
+
+
+if __name__ == "__main__":
+    run_tests()