Arm backend: support torch.sum.default (#15380)

When sum is called without arguments,
it is traced as sum.default rather than sum.dim_IntList, which 1) is
lowered to edge with dims=[] instead of None, and 2) is not annotated in
the quantizer.

This commit fixes those issues and adds tests.

Signed-off-by: Erik Lundell <erik.lundell@arm.com>

Author: Erik-Lundell

backends/arm/_passes/decompose_sum_pass.py

@@ -68,8 +68,8 @@ def call_operator(self, op, args, kwargs, meta):
             case _:
                 raise ValueError(f"Invalid number of arguments ({len(args)}) provided.")
 
-        # If dims is None, sum over all dimensions
-        if dims is None:
+        # If dims evaluates to False (None or []), sum over all dimensions
+        if not dims:
             shape = input_node.data.size()
             dims = list(range(len(shape)))
 

backends/arm/quantizer/quantization_annotator.py

@@ -284,6 +284,7 @@ def _match_pattern(
     torch.ops.aten.sin.default,
     torch.ops.aten.tanh.default,
     torch.ops.aten.sum.dim_IntList,
+    torch.ops.aten.sum.default,
     torch.ops.aten.hardsigmoid.default,
     torch.ops.aten.hardswish.default,
     torch.ops.aten.hardswish_.default,

backends/arm/scripts/parse_test_names.py

@@ -22,6 +22,7 @@
     "native_group_norm.default",
     "silu.default",
     "sdpa.default",
+    "sum.default",
     "unbind.int",
     "unflatten.int",
     "_native_batch_norm_legit_no_training.default",

backends/arm/test/ops/test_sum.py

@@ -3,7 +3,7 @@
 # This source code is licensed under the BSD-style license found in the
 # LICENSE file in the root directory of this source tree.
 
-from typing import Tuple
+from typing import Callable, Tuple
 
 import torch
 from executorch.backends.arm.test import common
@@ -61,7 +61,6 @@ def test_sum_dim_intlist_tosa_INT(test_data: input_t1):
         aten_op,
         exir_op=[],
     )
-    pipeline.dump_artifact("export")
     pipeline.run()
 
 
@@ -133,3 +132,30 @@ def test_view_u55_INT_failure_set(test_data: Tuple):
     )
     pipeline.pop_stage("check_count.exir")
     pipeline.run()
+
+
+input_t2 = tuple[torch.Tensor]
+
+
+class SumDefault(torch.nn.Module):
+    test_parameters = {
+        "rank1": lambda: (torch.rand(10),),
+        "rank2": lambda: (torch.rand(10, 1, 10),),
+        "rank4": lambda: (torch.rand(1, 1, 5, 8),),
+    }
+    aten_op = "torch.ops.aten.sum.default"
+
+    def forward(self, x: torch.Tensor):
+        return x.sum()
+
+
+@common.parametrize("test_data", SumDefault.test_parameters)
+def test_sum_tosa_FP(test_data: Callable[[], input_t2]):
+    pipeline = TosaPipelineFP[input_t2](SumDefault(), test_data(), SumDefault.aten_op)
+    pipeline.run()
+
+
+@common.parametrize("test_data", SumDefault.test_parameters)
+def test_sum_tosa_INT(test_data: Callable[[], input_t2]):
+    pipeline = TosaPipelineINT[input_t1](SumDefault(), test_data(), SumDefault.aten_op)
+    pipeline.run()