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  Getting Import error ImportError: cannot import name 'quantize' from 'transformers.convert_graph_to_onnx' (/opt/conda/lib/python3.7/site-packages/transformers/convert_graph_to_onnx.py)
  
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  ---------------------------------------------------------------------------
  ImportError                               Traceback (most recent call last)
  <ipython-input-19-60bf04c6de64> in <module>
  ----> 1 from simpletransformers.classification import MultiLabelClassificationModel
        2 
        3 
        4 model = MultiLabelClassificationModel('roberta', 'roberta-base', num_labels=6, args={'train_batch_size':2, 'gradient_accumulation_steps':16, 'learning_rate': 3e-5, 'num_train_epochs': 3, 'max_seq_length': 512})
  
  /opt/conda/lib/python3.7/site-packages/simpletransformers/classification/__init__.py in <module>
  ----> 1 from simpletransformers.classification.classification_model import ClassificationModel
        2 from simpletransformers.classification.multi_label_classification_model import MultiLabelClassificationModel
        3 from simpletransformers.classification.multi_modal_classification_model import MultiModalClassificationModel
        4 from simpletransformers.config.model_args import (
        5     ClassificationArgs,
  
  /opt/conda/lib/python3.7/site-packages/simpletransformers/classification/classification_model.py in <module>
       62     get_linear_schedule_with_warmup,
       63 )
  ---> 64 from transformers.convert_graph_to_onnx import convert, quantize
       65 
       66 from simpletransformers.classification.classification_utils import (
  
  ImportError: cannot import name 'quantize' from 'transformers.convert_graph_to_onnx' (/opt/conda/lib/python3.7/site-packages/transformers/convert_graph_to_onnx.py)