Arm backend: Remove obsolete import ignores

The mypy lint job now resolves the TOSA dependencies and
project-internal modules, so their import-not-found suppressions are
obsolete. Retain import-untyped suppressions for tosa-tools because
the package does not provide typing metadata.

Authored with Codex.

Signed-off-by: Per Held <per.held@arm.com>
Change-Id: I1adf6c3d6fc45923ae58238666e27d19272c39a7

Author: perheld

backends/arm/_passes/decompose_any_pass.py

@@ -11,13 +11,8 @@
     create_node,
     get_first_fake_tensor,
 )
-from executorch.exir.dialects._ops import (  # type: ignore[import-not-found]
-    ops as exir_ops,
-)
-from executorch.exir.pass_base import (  # type: ignore[import-not-found]
-    ExportPass,
-    PassResult,
-)
+from executorch.exir.dialects._ops import ops as exir_ops
+from executorch.exir.pass_base import ExportPass, PassResult
 
 
 class DecomposeAnyPass(ArmPass):

backends/arm/ethosu/compile_spec.py

@@ -8,9 +8,7 @@
 
 from executorch.backends.arm.common.arm_compile_spec import ArmCompileSpec
 from executorch.backends.arm.common.pipeline_config import ArmPassPipelineConfig
-from executorch.backends.arm.tosa import (  # type: ignore[import-not-found]
-    TosaSpecification,
-)
+from executorch.backends.arm.tosa import TosaSpecification
 from executorch.exir.backend.compile_spec_schema import CompileSpec
 
 

backends/arm/test/misc/test_process_node.py

@@ -15,7 +15,7 @@
 from executorch.backends.arm.tosa.specification import TosaSpecification
 from executorch.exir import to_edge
 from torch._export.utils import is_param
-from tosa.TosaGraph import TosaGraph  # type: ignore[import-not-found, import-untyped]
+from tosa.TosaGraph import TosaGraph  # type: ignore[import-untyped]
 from tosa_serializer.numpy_utils import pack_6bit_array
 
 

backends/arm/test/misc/test_reshape_permute_5d_regression.py

@@ -106,11 +106,9 @@ def _run_model(model: torch.nn.Module, out_dir: str) -> Path:
 
 
 def _assert_all_transposes_shape_consistent(tosa_path: Path) -> None:
-    import tosa.Op as Op  # type: ignore[import-not-found,import-untyped]
-    from tosa.TosaGraph import (  # type: ignore[import-not-found,import-untyped]
-        TosaGraph,
-    )
-    from tosa.TransposeAttribute import (  # type: ignore[import-not-found,import-untyped]
+    import tosa.Op as Op  # type: ignore[import-untyped]
+    from tosa.TosaGraph import TosaGraph  # type: ignore[import-untyped]
+    from tosa.TransposeAttribute import (  # type: ignore[import-untyped]
         TransposeAttribute,
     )
 

backends/arm/test/misc/test_tosa_constant_pool.py

@@ -10,7 +10,7 @@
 import pytest
 import tosa_serializer as ts
 from executorch.backends.arm.tosa.constant_pool import TosaSerializerWithConstantPool
-from tosa.TosaGraph import TosaGraph  # type: ignore[import-not-found, import-untyped]
+from tosa.TosaGraph import TosaGraph  # type: ignore[import-untyped]
 
 
 def _serializer(path_prefix=""):

backends/arm/test/misc/tosa_dialect/test_tosa_shape_node_visitors.py

@@ -21,7 +21,7 @@
 from executorch.backends.arm.tosa.mapping import TosaArg
 from executorch.backends.arm.tosa.specification import TosaSpecification
 from torch.fx import Node
-from tosa.TosaGraph import TosaGraph  # type: ignore[import-not-found, import-untyped]
+from tosa.TosaGraph import TosaGraph  # type: ignore[import-untyped]
 
 
 SHAPE_VISITOR_TARGETS = {

backends/arm/test/runner_utils.py

@@ -41,7 +41,7 @@
 from executorch.exir.lowered_backend_module import LoweredBackendModule
 from torch.fx.node import Node
 from torch.overrides import TorchFunctionMode
-from tosa.TosaGraph import TosaGraph  # type: ignore[import-not-found, import-untyped]
+from tosa.TosaGraph import TosaGraph  # type: ignore[import-untyped]
 
 logger = logging.getLogger(__name__)
 
@@ -1278,7 +1278,7 @@ def run_tosa_graph(
     inputs_np = [torch_tensor_to_numpy(input_tensor) for input_tensor in inputs]
 
     if isinstance(tosa_version, Tosa_1_00):
-        import tosa_reference_model as reference_model  # type: ignore[import-not-found, import-untyped]
+        import tosa_reference_model as reference_model  # type: ignore[import-untyped]
 
         debug_mode = "ALL" if logger.getEffectiveLevel() <= logging.DEBUG else None
         outputs_np, status = reference_model.run(

backends/arm/test/tester/test_pipeline.py

@@ -505,7 +505,7 @@ def is_tosa_ref_model_available():
         # Not all deployments of ET have the TOSA reference model available.
         # Make sure we don't try to use it if it's not available.
         try:
-            import tosa_reference_model  # type: ignore[import-not-found, import-untyped]
+            import tosa_reference_model  # type: ignore[import-untyped]
 
             # Check if the module has content
             return bool(dir(tosa_reference_model))

backends/arm/tosa/dialect/real_impl.py

@@ -57,7 +57,7 @@ def real_impl(*args, **kwargs) -> torch.Tensor:
         # Import lazily: the reference model is only needed to execute an op,
         # not to import the dialect. Linking the native extension into every
         # dialect consumer overflows the ELF relocation limit in large builds.
-        import tosa_reference_model as reference_model  # type: ignore[import-not-found, import-untyped]
+        import tosa_reference_model as reference_model  # type: ignore[import-untyped]
         import tosa_serializer as ts
 
         bound = signature.bind(*args, **kwargs)

backends/arm/vgf/backend.py

@@ -31,30 +31,23 @@
     PassInsertions,
     register_pass_insertions_before,
 )
-from executorch.backends.arm.tosa.backend import (  # type: ignore[import-not-found]
+from executorch.backends.arm.tosa.backend import (
     arm_get_first_delegation_tag,
     TOSABackend,
 )
-from executorch.backends.arm.vgf._passes import (  # type: ignore[import-not-found]
+from executorch.backends.arm.vgf._passes import (
     FuseGridSamplerFlowOffsetPass,
     InsertGridSamplerGridDequantPass,
     RewriteGridSamplerToTosaCustomPass,
 )
 
-from executorch.backends.arm.vgf.compile_spec import (  # type: ignore[import-not-found]
-    VgfCompileSpec,
-)
-from executorch.backends.arm.vgf.model_converter import (  # type: ignore[import-not-found]
+from executorch.backends.arm.vgf.compile_spec import VgfCompileSpec
+from executorch.backends.arm.vgf.model_converter import (
     model_converter_env,
     require_model_converter_executable,
 )
-from executorch.exir.backend.backend_details import (  # type: ignore[import-not-found]
-    BackendDetails,
-    PreprocessResult,
-)
-from executorch.exir.backend.compile_spec_schema import (  # type: ignore[import-not-found]
-    CompileSpec,
-)
+from executorch.exir.backend.backend_details import BackendDetails, PreprocessResult
+from executorch.exir.backend.compile_spec_schema import CompileSpec
 from executorch.exir.pass_base import ExportPass
 from torch.export.exported_program import ExportedProgram