add op(native group norm) | feat(atenlib)

onnxscript/function_libs/torch_aten/ops/core.py

@@ -4288,19 +4288,80 @@ def aten_native_dropout_backward(
     raise NotImplementedError()
 
 
+@torch_op("aten::native_group_norm", trace_only=True)
 def aten_native_group_norm(
-    input: TensorType,
-    weight: Optional[TensorType],
-    bias: Optional[TensorType],
-    N: INT64,
-    C: INT64,
-    HxW: INT64,
-    group: int,
-    eps: float,
-) -> tuple[TensorType, TensorType, TensorType]:
+    input: TFloat,
+    weight: Optional[TFloat] = None,
+    bias: Optional[TFloat] = None,
+    N: Optional[INT64] = None,  # pylint: disable=unused-argument
+    C: Optional[INT64] = None,  # pylint: disable=unused-argument
+    HxW: Optional[INT64] = None,  # pylint: disable=unused-argument
+    group: int = 1,
+    eps: float = 1e-05,
+) -> Tuple[TFloat, TFloat, TFloat]:
     """native_group_norm(Tensor input, Tensor? weight, Tensor? bias, SymInt N, SymInt C, SymInt HxW, int group, float eps) -> (Tensor, Tensor, Tensor)"""
 
-    raise NotImplementedError()
+    # Actually we don't need N,C,HxW value because the input tensor has that information
+    if weight is None:  # Set to 1.0 as default, the shape is Channel size
+        weight = op.Expand(op.Constant(value_floats=[1.0]), op.Shape(input, start=1, end=2))
+
+    if bias is None:  # Set to 0.0 as default, the shape is Channel size
+        bias = op.Expand(op.Constant(value_floats=[0.0]), op.Shape(input, start=1, end=2))
+
+    # Accoding to Torch, return rstd instead of var
+    norm, mean, rstd = _aten_native_group_norm_onnx(input, weight, bias, group, eps)
+    return norm, mean, rstd
+
+
+@torch_op("aten::native_group_norm", private=True)
+def _aten_native_group_norm_onnx(
+    input: TFloat,
+    weight: TFloat,
+    bias: TFloat,
+    group: INT64,
+    eps: float,
+) -> Tuple[TFloat, TFloat, TFloat]:
+    # Because onnx.GroupNorm() need size=group for weight and bias
+    # But the torch's aten function's input need size=channel, the size mismatched
+    # So we have to use onnx.InstanceNorm() to simulate
+    neg_1 = op.Constant(value_ints=[-1])
+    # Create weight_instance_norm and bias_instance_norm, copied from Torch ONNX converter
+    group_tensor = op.Reshape(group, neg_1)
+    # 0 in the shape list keeps dimension value unchanged, for InstanceNorm need [0,group,-1]
+    shape_input = op.Concat(op.Constant(value_ints=[0]), group_tensor, neg_1, axis=0)
+    input_reshaped = op.Reshape(input, shape_input)
+    weight_inst_norm = op.Expand(op.Constant(value_floats=[1.0]), group_tensor)
+    bias_inst_norm = op.Expand(op.Constant(value_floats=[0.0]), group_tensor)
+    norm = op.InstanceNormalization(
+        input_reshaped, weight_inst_norm, bias_inst_norm, epsilon=eps
+    )
+    # Reshape back to input's shape
+    norm = op.Reshape(norm, op.Shape(input))
+    # Using the input weight and bias to do affine
+    # But need to unsqueeze to the target shape for broading cast easy
+    input_rank = op.Size(op.Shape(input))
+    axes_unsqueeze = op.Range(1, input_rank - 1, 1)
+    weight_full_shape = op.Unsqueeze(weight, axes_unsqueeze)
+    bias_full_shape = op.Unsqueeze(bias, axes_unsqueeze)
+    norm_mul_weight = op.Mul(norm, weight_full_shape)
+    norm_result = op.Add(norm_mul_weight, bias_full_shape)
+    # Compute mean and rstd, but using Torch algorithm
+    # The returned shape for mean and vstd should be [N, group, -1]
+    N = op.Shape(input, start=0, end=1)
+    shape_N_group_neg1 = op.Concat(N, group_tensor, neg_1, axis=0)
+    input_N_group_neg1 = op.Reshape(input, shape_N_group_neg1)
+    # The output size is [N, group], so dims = [2]
+    axes = op.Constant(value_ints=[2])
+    # Get mean which size is [N, group, 1], for broadcasting
+    mean = op.ReduceMean(input_N_group_neg1, axes)
+    input_sub_mean = op.Sub(input_N_group_neg1, mean)
+    sqr_input_sub_mean = op.Mul(input_sub_mean, input_sub_mean)
+    # In Pytorch, vstd = 1/(sqrt(var + eps))
+    var = op.ReduceMean(sqr_input_sub_mean, axes, keepdims=0)
+    rstd = op.Div(1.0, op.Sqrt(var + eps))
+    # Get the correct shape [N, group] for mean again
+    mean = op.ReduceMean(input_N_group_neg1, axes, keepdims=0)
+    return norm_result, mean, rstd
 
 
 def aten_native_group_norm_backward(

onnxscript/tests/function_libs/torch_aten/extra_opinfo.py

@@ -227,6 +227,39 @@ def sample_inputs_max_pool3d_with_indices(op_info, device, dtype, requires_grad,
         yield opinfo_core.SampleInput(arg, kwargs=kwargs)
 
 
+def sample_inputs_native_group_norm(op_info, device, dtype, requires_grad, **kwargs):
+    del op_info
+    make_arg = functools.partial(
+        torch_testing.make_tensor, device=device, dtype=dtype, requires_grad=requires_grad
+    )
+
+    # Ordered as input shape, C,N,HxW, and kwargs for group and eps
+    cases = (
+        ((1, 6, 3), (6,), (6,), 1, 6, 3, {"group": 2, "eps": 0.5}),
+        ((2, 6, 3), (6,), (6,), 2, 6, 3, {"group": 3, "eps": -0.5}),
+        ((5, 5, 5), (5,), (5,), 5, 5, 5, {"group": 1, "eps": 1e-5}),
+        ((5, 8, 10), (8,), (8,), 5, 8, 10, {"group": 4, "eps": 1e-5}),
+    )
+
+    for input_shape, weight, bias, N, C, HxW, kwargs in cases:
+        # args: running mean, running var, weight and bias should necessarily be of shape: (channels,)
+        channels = input_shape[1] if len(input_shape) > 1 else 0
+        weight = make_arg(channels) if channels > 0 else None
+        bias = make_arg(channels) if channels > 0 else None
+
+        yield opinfo_core.SampleInput(
+            make_arg(input_shape),
+            args=(
+                weight,
+                bias,
+                N,
+                C,
+                HxW,
+            ),
+            kwargs=kwargs,
+        )
+
+
 def sample_inputs_col2im(op_info, device, dtype, requires_grad, **kwargs):
     del op_info
     # input_shape, output_size, kernal, dilation, padding, stride
@@ -316,6 +349,14 @@ def sample_inputs_col2im(op_info, device, dtype, requires_grad, **kwargs):
         skips=(),
         supports_out=False,
     ),
+    opinfo_core.OpInfo(
+        "native_group_norm",
+        op=torch.ops.aten.native_group_norm,
+        aten_name="native_group_norm",
+        dtypes=common_dtype.floating_and_complex_types_and(torch.half, torch.bfloat16),
+        sample_inputs_func=sample_inputs_native_group_norm,
+        supports_out=False,
+    ),
     opinfo_core.OpInfo(
         "nn.functional.conv3d",
         aliases=("conv3d",),

onnxscript/tests/function_libs/torch_aten/ops_correctness_test.py

@@ -701,6 +701,7 @@ def _where_input_wrangler(
     "index_select": core_ops.aten_index_select,
     "layer_norm": core_ops.aten_layer_norm,
     "max": core_ops.aten_max,
+    "native_group_norm": core_ops.aten_native_group_norm,
     "native_batch_norm": core_ops.aten_native_batch_norm,
     "native_layer_norm": core_ops.aten_native_layer_norm,
     "new_empty": core_ops.aten_new_empty,