[ONNX] Support ScatterElements with reduction

include/tvm/relay/attrs/transform.h

@@ -164,6 +164,18 @@ struct ScatterAddAttrs : public tvm::AttrsNode<ScatterAddAttrs> {
   }
 };
 
+struct ScatterElementsAttrs : public tvm::AttrsNode<ScatterElementsAttrs> {
+  Integer axis;
+  String reduction;
+
+  TVM_DECLARE_ATTRS(ScatterElementsAttrs, "relay.attrs.ScatterElementsAttrs") {
+    TVM_ATTR_FIELD(axis).set_default(0).describe("The axis over which to select values.");
+    TVM_ATTR_FIELD(reduction).set_default("update").describe(
+        "Reduction mode of the scatter elements, "
+        "either \"update\", \"add\", \"mul\", \"min\" or \"max\".");
+  }
+};
+
 struct ScatterNDAttrs : public tvm::AttrsNode<ScatterNDAttrs> {
   String mode;
 

python/tvm/relay/frontend/onnx.py

@@ -2848,11 +2848,59 @@ class Scatter(OnnxOpConverter):
     """Operator converter for Scatter."""
 
     @classmethod
-    def _impl_v1(cls, inputs, attr, params):
+    def _impl_v9(cls, inputs, attr, params):
         axis = attr.get("axis", 0)
         return _op.scatter(inputs[0], inputs[1], inputs[2], axis)
 
 
+class ScatterElements(OnnxOpConverter):
+    """Operator converter for ScatterElements."""
+
+    @classmethod
+    def _args_check(cls, inputs, attr, red_valids=None):
+        ret = []
+        assert (
+            len(inputs) == 3
+        ), "ScatterElements takes 3 inputs (data, indices, updates), {} given".format(len(inputs))
+        assert infer_type(inputs[1]).checked_type.dtype in ["int32", "int64"]
+
+        axis = attr.get("axis", 0)
+        rank = len(infer_shape(inputs[0]))
+        assert rank > 0, "Data rank higher than 0 is expected"
+        assert -rank <= axis < rank, "Axis is out of bounds"
+        ret.append(axis)
+
+        if red_valids:
+            reduction = attr.get("reduction", None)
+            if reduction is None:
+                reduction = b"update"
+            reduction = reduction.decode("utf-8")
+            assert reduction in red_valids, "Only {} modes are supported, but {} is gotten".format(
+                red_valids, reduction
+            )
+            ret.append(reduction)
+
+        return ret
+
+    @classmethod
+    def _impl_v11(cls, inputs, attr, params):
+        axis = cls._args_check(inputs, attr)
+
+        return _op.scatter_elements(inputs[0], inputs[1], inputs[2], axis, "update")
+
+    @classmethod
+    def _impl_v16(cls, inputs, attr, params):
+        axis, reduction = cls._args_check(inputs, attr, ["update", "add", "mul"])
+
+        return _op.scatter_elements(inputs[0], inputs[1], inputs[2], axis, reduction)
+
+    @classmethod
+    def _impl_v18(cls, inputs, attr, params):
+        axis, reduction = cls._args_check(inputs, attr, ["update", "add", "mul", "min", "max"])
+
+        return _op.scatter_elements(inputs[0], inputs[1], inputs[2], axis, reduction)
+
+
 class ScatterND(OnnxOpConverter):
     """Operator converter for ScatterND."""
 
@@ -6588,7 +6636,7 @@ def _get_convert_map(opset):
         "Compress": Compress.get_converter(opset),
         "Size": AttrCvt("ndarray_size", extras={"dtype": "int64"}),
         "Scatter": Scatter.get_converter(opset),
-        "ScatterElements": Scatter.get_converter(opset),
+        "ScatterElements": ScatterElements.get_converter(opset),
         "ScatterND": ScatterND.get_converter(opset),
         "EyeLike": EyeLike.get_converter(opset),
         "Squeeze": Squeeze.get_converter(opset),

python/tvm/relay/op/_transform.py

@@ -204,6 +204,15 @@ def compute_scatter_add(attrs, inputs, output_type):
 
 _reg.register_strategy("scatter_add", strategy.scatter_add_strategy)
 
+# scatter_elements
+@_reg.register_compute("scatter_elements")
+def compute_scatter_elements(attrs, inputs, output_type):
+    """Compute definition of scatter_elements"""
+    return [topi.scatter_elements(inputs[0], inputs[1], inputs[2], attrs.axis, attrs.reduction)]
+
+
+_reg.register_strategy("scatter_elements", strategy.scatter_elements_strategy)
+
 # scatter_nd
 @_reg.register_compute("scatter_nd")
 def compute_scatter_nd(attrs, inputs, output_type):
@@ -679,6 +688,7 @@ def argwhere_shape_func(attrs, inputs, out_ndims):
 
 _reg.register_shape_func("scatter", False, elemwise_shape_func)
 _reg.register_shape_func("scatter_add", False, elemwise_shape_func)
+_reg.register_shape_func("scatter_elements", False, elemwise_shape_func)
 _reg.register_shape_func("scatter_nd", False, elemwise_shape_func)
 
 

python/tvm/relay/op/op_attrs.py

@@ -639,6 +639,11 @@ class ScatterAddAttrs(Attrs):
     """Attributes used in scatter_add operators"""
 
 
+@tvm._ffi.register_object("relay.attrs.ScatterElementsAttrs")
+class ScatterElementsAttrs(Attrs):
+    """Attributes used in scatter_elements operators"""
+
+
 @tvm._ffi.register_object("relay.attrs.ScatterNDAttrs")
 class ScatterNDAttrs(Attrs):
     """Attributes used in scatter_nd operators"""

python/tvm/relay/op/strategy/cuda.py

@@ -1099,6 +1099,20 @@ def scatter_add_cuda(attrs, inputs, out_type, target):
     return strategy
 
 
+@scatter_elements_strategy.register(["cuda", "gpu"])
+def scatter_elements_cuda(attrs, inputs, out_type, target):
+    """scatter elements cuda strategy"""
+    strategy = _op.OpStrategy()
+    strategy.add_implementation(
+        wrap_compute_scatter_elements(topi.cuda.scatter_elements),
+        wrap_topi_schedule(topi.cuda.schedule_extern),
+        name="scatter_elements.cuda",
+        plevel=10,
+    )
+    # TODO(vvchernov): There is possible specification for rank=1 as for scatter
+    return strategy
+
+
 @scatter_nd_strategy.register(["cuda", "gpu"])
 def scatter_nd_cuda(attrs, inputs, out_type, target):
     """scatter_nd cuda strategy"""

python/tvm/relay/op/strategy/generic.py

@@ -1580,6 +1580,28 @@ def scatter_add_strategy(attrs, outs, out_type, target):
     return strategy
 
 
+# scatter_elements
+@override_native_generic_func("scatter_elements_strategy")
+def scatter_elements_strategy(attrs, inputs, out_type, target):
+    """scatter_elements generic strategy"""
+    strategy = _op.OpStrategy()
+    strategy.add_implementation(
+        wrap_compute_scatter_elements(topi.scatter_elements),
+        wrap_topi_schedule(topi.generic.schedule_extern),
+        name="scatter_elements.generic",
+    )
+    return strategy
+
+
+def wrap_compute_scatter_elements(topi_compute):
+    """Wrap scatter_elements topi compute"""
+
+    def _compute_scatter_elements(attrs, inputs, _):
+        return [topi_compute(inputs[0], inputs[1], inputs[2], attrs.axis, attrs.reduction)]
+
+    return _compute_scatter_elements
+
+
 # scatter_nd
 @override_native_generic_func("scatter_nd_strategy")
 def scatter_nd_strategy(attrs, inputs, out_type, target):

python/tvm/relay/op/transform.py

@@ -403,6 +403,41 @@ def scatter_add(data, indices, updates, axis):
     return _make.scatter_add(data, indices, updates, axis)
 
 
+def scatter_elements(data, indices, updates, axis=0, reduction="update"):
+    """Scatter elements with updating data by reduction of values in updates
+    at positions defined by indices.
+
+    Parameters
+    ----------
+    data : relay.Expr
+        The input data to the operator.
+
+    indices : relay.Expr
+        The index locations to update.
+
+    updates : relay.Expr
+        The values to update.
+
+    axis : int
+        The axis to scatter elements on. It is zero by default.
+
+    reduction : string, optional
+        The reduction mode for scatter. Choise is from ["update", "add", "mul", "min", max"]
+        If update, the update values will replace the input data
+        If add, the update values will be added to the input data
+        If mul, the update values will be multiply to the input data
+        If min, there is choice of minimal between the update values and the input data
+        If max, there is choice of maximal between the update values and the input data
+        It is "update" by default
+
+    Returns
+    -------
+    ret : relay.Expr
+        The computed result.
+    """
+    return _make.scatter_elements(data, indices, updates, axis, reduction)
+
+
 def scatter_nd(data, indices, updates, mode="update"):
     """Scatter values from an array and update.
 

python/tvm/topi/__init__.py

@@ -38,6 +38,7 @@
 from .broadcast import *
 from .sort import *
 from .scatter import *
+from .scatter_elements import *
 from .sparse_fill_empty_rows import *
 from .sparse_reshape import *
 from .scatter_add import *

python/tvm/topi/cuda/__init__.py

@@ -46,6 +46,7 @@
 from .nms import get_valid_counts, non_max_suppression, all_class_non_max_suppression
 from .rcnn import *
 from .scatter import *
+from .scatter_elements import *
 from .sort import *
 from .conv2d_nhwc_tensorcore import *
 from .conv3d_ndhwc_tensorcore import *