Remove dependency checks from __init__ files

Backends are not separated well enough for this
to work.

Signed-off-by: Erik Lundell <erik.lundell@arm.com>
Change-Id: Iccd75cac6e28cad20d858443908a1d39dd58527c

Author: Erik-Lundell

backends/arm/ethosu/__init__.py

@@ -1,40 +1,9 @@
-# Copyright 2025-2026 Arm Limited and/or its affiliates.
+# Copyright 2025 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.
 #
 
-from importlib.util import find_spec
-
-
-def _missing_dependencies_error(missing: str) -> ModuleNotFoundError:
-    return ModuleNotFoundError(
-        "Ethos-U backend dependencies are not installed "
-        f"(missing: {missing}). Install ExecuTorch with "
-        "`pip install executorch[ethos_u]`, or if building from source run "
-        "`examples/arm/setup.sh --i-agree-to-the-contained-eula`."
-    )
-
-
-def _ensure_ethos_u_dependencies() -> None:
-    required_modules = {
-        "ethosu.vela": "ethos-u-vela",
-        "tosa_serializer": "tosa-tools",
-    }
-    missing_packages = []
-    for module_name, package_name in required_modules.items():
-        try:
-            if find_spec(module_name) is None:
-                missing_packages.append(package_name)
-        except (ImportError, ValueError):
-            missing_packages.append(package_name)
-
-    if missing_packages:
-        raise _missing_dependencies_error(", ".join(missing_packages))
-
-
-_ensure_ethos_u_dependencies()
-
 from .backend import EthosUBackend  # noqa: F401
 from .compile_spec import EthosUCompileSpec  # noqa: F401
 from .partitioner import EthosUPartitioner  # noqa: F401

backends/arm/vgf/__init__.py

@@ -1,52 +1,9 @@
-# Copyright 2025-2026 Arm Limited and/or its affiliates.
+# Copyright 2025 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.
 #
 
-from importlib.metadata import PackageNotFoundError, version
-from importlib.util import find_spec
-
-
-def _missing_dependencies_error(missing: str) -> ModuleNotFoundError:
-    return ModuleNotFoundError(
-        "VGF backend dependencies are not installed "
-        f"(missing: {missing}). Install ExecuTorch with "
-        "`pip install executorch[vgf]`, or if building from source run "
-        "`examples/arm/setup.sh --i-agree-to-the-contained-eula "
-        "--disable-ethos-u-deps --enable-mlsdk-deps`."
-    )
-
-
-def _ensure_vgf_dependencies() -> None:
-    required_distributions = (
-        "ai_ml_emulation_layer_for_vulkan",
-        "ai_ml_sdk_model_converter",
-        "ai_ml_sdk_vgf_library",
-    )
-    required_modules = {
-        "tosa_serializer": "tosa-tools",
-    }
-    missing_packages = []
-    for package_name in required_distributions:
-        try:
-            version(package_name)
-        except PackageNotFoundError:
-            missing_packages.append(package_name)
-
-    for module_name, package_name in required_modules.items():
-        try:
-            if find_spec(module_name) is None:
-                missing_packages.append(package_name)
-        except (ImportError, ValueError):
-            missing_packages.append(package_name)
-
-    if missing_packages:
-        raise _missing_dependencies_error(", ".join(missing_packages))
-
-
-_ensure_vgf_dependencies()
-
 from .backend import VgfBackend  # noqa: F401
 from .compile_spec import VgfCompileSpec  # noqa: F401
 from .partitioner import VgfPartitioner  # noqa: F401