Fix imports 2

Author: nikita-savelyevv

optimum/intel/openvino/quantization/quantizer.py

@@ -19,13 +19,10 @@
 from pathlib import Path
 from typing import Callable, Dict, Iterable, List, Optional, Sized, Union
 
-import nncf
 import openvino
 import torch
 import transformers
 from huggingface_hub.constants import HUGGINGFACE_HUB_CACHE
-from nncf.quantization.advanced_parameters import OverflowFix
-from nncf.torch import register_module
 from openvino._offline_transformations import compress_quantize_weights_transformation
 from openvino.runtime import Core
 from torch.utils._pytree import tree_map
@@ -41,7 +38,7 @@
 from ...utils.constant import _TASK_ALIASES
 from ...utils.import_utils import (
     is_datasets_available,
-    is_diffusers_available,
+    is_diffusers_available, is_nncf_available,
 )
 from ...utils.modeling_utils import get_model_device
 from ..modeling_base import OVBaseModel
@@ -64,6 +61,11 @@
 if is_datasets_available():
     from datasets import Dataset
 
+if is_nncf_available():
+    import nncf
+    from nncf.quantization.advanced_parameters import OverflowFix
+    from nncf.torch import register_module
+
 register_module(ignored_algorithms=[])(Conv1D)
 
 core = Core()