Added try for backends (#3138)

### Changes

- Added `try-catch` blocks for `isinstance` during backend calculation.

### Reason for changes

- Corrupted frameworks may lead to exceptions even if these frameworks
were not intended to be used.

### Related tickets

- 158806

### Tests

- Manual

Author: nikita-malininn

nncf/common/utils/backend.py

@@ -11,7 +11,7 @@
 import importlib
 from copy import deepcopy
 from enum import Enum
-from typing import List, TypeVar
+from typing import Any, Callable, List, TypeVar
 
 import nncf
 
@@ -26,6 +26,16 @@ class BackendType(Enum):
     OPENVINO = "OpenVINO"
 
 
+def result_verifier(func: Callable[[TModel], bool]) -> Callable[..., None]:
+    def verify_result(*args: Any, **kwargs: Any):  # type: ignore
+        try:
+            return func(*args, **kwargs)
+        except AttributeError:
+            return False
+
+    return verify_result
+
+
 def get_available_backends() -> List[BackendType]:
     """
     Returns a list of available backends.
@@ -51,6 +61,7 @@ def get_available_backends() -> List[BackendType]:
     return available_backends
 
 
+@result_verifier
 def is_torch_model(model: TModel) -> bool:
     """
     Returns True if the model is an instance of torch.nn.Module and not a torch.fx.GraphModule, otherwise False.
@@ -64,6 +75,7 @@ def is_torch_model(model: TModel) -> bool:
     return not isinstance(model, torch.fx.GraphModule) and isinstance(model, torch.nn.Module)
 
 
+@result_verifier
 def is_torch_fx_model(model: TModel) -> bool:
     """
     Returns True if the model is an instance of torch.fx.GraphModule, otherwise False.
@@ -76,6 +88,7 @@ def is_torch_fx_model(model: TModel) -> bool:
     return isinstance(model, torch.fx.GraphModule)
 
 
+@result_verifier
 def is_tensorflow_model(model: TModel) -> bool:
     """
     Returns True if the model is an instance of tensorflow.Module, otherwise False.
@@ -88,6 +101,7 @@ def is_tensorflow_model(model: TModel) -> bool:
     return isinstance(model, tensorflow.Module)
 
 
+@result_verifier
 def is_onnx_model(model: TModel) -> bool:
     """
     Returns True if the model is an instance of onnx.ModelProto, otherwise False.
@@ -100,6 +114,7 @@ def is_onnx_model(model: TModel) -> bool:
     return isinstance(model, onnx.ModelProto)
 
 
+@result_verifier
 def is_openvino_model(model: TModel) -> bool:
     """
     Returns True if the model is an instance of openvino.runtime.Model, otherwise False.
@@ -112,6 +127,7 @@ def is_openvino_model(model: TModel) -> bool:
     return isinstance(model, ov.Model)
 
 
+@result_verifier
 def is_openvino_compiled_model(model: TModel) -> bool:
     """
     Returns True if the model is an instance of openvino.runtime.CompiledModel, otherwise False.
@@ -150,7 +166,7 @@ def get_backend(model: TModel) -> BackendType:
 
     raise nncf.UnsupportedBackendError(
         "Could not infer the backend framework from the model type because "
-        "the framework is not available or the model type is unsupported. "
+        "the framework is not available or corrupted, or the model type is unsupported. "
         "The available frameworks found: {}.".format(", ".join([b.value for b in available_backends]))
     )