[Arm backend] Fix for TOSA BI clamp ops

backends/arm/operators/op_hardtanh.py

@@ -1,4 +1,4 @@
-# Copyright 2023 Arm Limited and/or its affiliates.
+# Copyright 2023-2024 Arm Limited and/or its affiliates.
 #
 # This source code is licensed under the BSD-style license found in the
 # LICENSE file in the root directory of this source tree.
@@ -11,6 +11,8 @@
     register_node_visitor,
 )
 from executorch.backends.arm.tosa_mapping import TosaArg
+
+from executorch.backends.arm.tosa_quant_utils import get_quant_node_args
 from serializer.tosa_serializer import TosaOp
 
 
@@ -30,12 +32,31 @@ def define_node(
         is_quant_node: bool,
     ) -> None:
         attr = ts.TosaSerializerAttribute()
+
+        if is_quant_node:
+            # Get quant parameters
+            scale, zp = get_quant_node_args(node.all_input_nodes[0])
+            # Convert to quantized representation
+            clamp_min_qs = round((inputs[1].number / scale) + zp)
+            clamp_min_qs = max(clamp_min_qs, -128)
+            clamp_max_qs = round((inputs[2].number / scale) + zp)
+            clamp_max_qs = min(clamp_max_qs, 127)
+            # Set fp values to 0.0 since they are not used
+            clamp_min_fp = 0.0
+            clamp_max_fp = 0.0
+        else:
+            clamp_min_fp = inputs[1].number
+            clamp_max_fp = inputs[2].number
+            # Set qs values to 0 since they are not used
+            clamp_min_qs = 0
+            clamp_max_qs = 0
+
         attr.ClampAttribute(
             tosa_graph.builder,
-            int(inputs[1].number),
-            int(inputs[2].number),
-            inputs[1].number,
-            inputs[2].number,
+            clamp_min_qs,
+            clamp_max_qs,
+            clamp_min_fp,
+            clamp_max_fp,
         )
 
         tosa_graph.addOperator(TosaOp.Op().CLAMP, [inputs[0].name], [output.name], attr)

backends/arm/test/ops/test_conv_combos.py

@@ -12,6 +12,7 @@
 import torch
 from executorch.backends.arm.test import common
 from executorch.backends.arm.test.tester.arm_tester import ArmTester
+from parameterized import parameterized
 
 logger = logging.getLogger(__name__)
 logger.setLevel(logging.INFO)
@@ -126,6 +127,32 @@ def forward(self, x):
         return x
 
 
+class ComboConvRelu6(torch.nn.Module):
+    edge_op_list = [
+        "executorch_exir_dialects_edge__ops_aten_convolution_default",
+        "executorch_exir_dialects_edge__ops_aten_hardtanh_default",
+    ]
+
+    test_data = [
+        (20 * torch.randn(1, 3, 256, 256),),
+        (5 * torch.randn(1, 3, 256, 256),),
+        (torch.randn(1, 3, 256, 256),),
+        (-5 * torch.randn(1, 3, 256, 256),),
+    ]
+
+    def __init__(self):
+        super().__init__()
+        self.conv2d = torch.nn.Conv2d(
+            in_channels=3, out_channels=3, kernel_size=3, stride=1, groups=1
+        )
+        self.relu6 = torch.nn.ReLU6()
+
+    def forward(self, x):
+        x = self.conv2d(x)
+        x = self.relu6(x)
+        return x
+
+
 class TestConvCombos(unittest.TestCase):
     def _test_conv_combo_tosa_MI_pipeline(
         self, module: torch.nn.Module, test_data: Tuple[torch.Tensor]
@@ -222,15 +249,9 @@ def test_conv_batchnorm_relu_tosa_MI(self):
         model = ComboConvBatchnormRelu()
         self._test_conv_combo_tosa_MI_pipeline(model, model.get_inputs())
 
-    # TODO(MLETORCH-85): Investigate numerical issue. This diff is present in legacy
-    # testcase as well (and also not tested). For now, just increase the
-    # tolerance, such that we don't skip the test entirely (i.e. we maintain
-    # functionality).
     def test_conv_batchnorm_relu_tosa_BI(self):
         model = ComboConvBatchnormRelu()
-        self._test_conv_combo_tosa_BI_pipeline(
-            model, model.get_inputs(), atol=1.0, rtol=1.0
-        )
+        self._test_conv_combo_tosa_BI_pipeline(model, model.get_inputs())
 
     @unittest.skipIf(
         not common.VELA_INSTALLED,
@@ -240,21 +261,41 @@ def test_conv_batchnorm_relu_u55_BI(self):
         model = ComboConvBatchnormRelu()
         self._test_conv_combo_u55_BI_pipeline(model, model.get_inputs())
 
+    ##################
+    ## Conv + ReLU6 ##
+    ##################
+    @parameterized.expand(ComboConvRelu6.test_data)
+    def test_conv_relu6_tosa_MI(self, test_data: torch.Tensor):
+        model = ComboConvRelu6()
+        test_data = (test_data,)
+        self._test_conv_combo_tosa_MI_pipeline(model, test_data)
+
+    @parameterized.expand(ComboConvRelu6.test_data)
+    def test_conv_relu6_tosa_BI(self, test_data: torch.Tensor):
+        model = ComboConvRelu6()
+        test_data = (test_data,)
+        self._test_conv_combo_tosa_BI_pipeline(model, test_data)
+
+    @parameterized.expand(ComboConvRelu6.test_data)
+    @unittest.skipIf(
+        not common.VELA_INSTALLED,
+        "There is no point in running U55 tests if the Vela tool is not installed",
+    )
+    def test_conv_relu6_u55_BI(self, test_data: torch.Tensor):
+        model = ComboConvRelu6()
+        test_data = (test_data,)
+        self._test_conv_combo_u55_BI_pipeline(model, test_data)
+
     ###############################
     ## Block bottleneck residual ##
     ###############################
     def test_block_bottleneck_residual_tosa_MI(self):
         model = ComboBlockBottleneckResidual()
         self._test_conv_combo_tosa_MI_pipeline(model, model.get_inputs())
 
-    # TODO(MLETORCH-85): Investigate numerical issue. This diff was present in legacy
-    # testcase as well. For now, just increase the tolerance, such that
-    # we don't skip the test entirely (i.e. we maintain functionality).
     def test_block_bottleneck_residual_tosa_BI(self):
         model = ComboBlockBottleneckResidual()
-        self._test_conv_combo_tosa_BI_pipeline(
-            model, model.get_inputs(), atol=1.0, rtol=1.0
-        )
+        self._test_conv_combo_tosa_BI_pipeline(model, model.get_inputs())
 
     @unittest.skipIf(
         not common.VELA_INSTALLED,

backends/xnnpack/test/tester/tester.py

@@ -595,7 +595,7 @@ def _assert_outputs_equal(model_output, ref_output, atol=1e-03, rtol=1e-03):
                 f"Output {i} does not match reference output.\n"
                 f"\tGiven atol: {atol}, rtol: {rtol}.\n"
                 f"\tOutput tensor shape: {model.shape}, dtype: {model.dtype}\n"
-                f"\tDifference: max: {torch.max(model-ref)}, abs: {torch.max(torch.abs(model-ref))}.\n"
+                f"\tDifference: max: {torch.max(model-ref)}, abs: {torch.max(torch.abs(model-ref))}, mean abs error: {torch.mean(torch.abs(model-ref))}.\n"
                 f"\t-- Model vs. Reference --\n"
                 f"\t Numel: {model.numel()}, {ref.numel()}\n"
                 f"\tMedian: {model.median()}, {ref.median()}\n"