Remove import that no longer exists in Transformers

This is a copy of the PR from https://huggingface.co/MiniMaxAI/MiniMax-Text-01/discussions/5

modeling_minimax_text_01.py

@@ -22,7 +22,6 @@ from transformers.modeling_outputs import (
     SequenceClassifierOutputWithPast,
 )
 from transformers.modeling_utils import PreTrainedModel
-from transformers.pytorch_utils import is_torch_greater_or_equal_than_1_13
 from transformers.utils import (
     add_start_docstrings,
     add_start_docstrings_to_model_forward,
@@ -42,9 +41,6 @@ if is_flash_attn_2_available():
 # This makes `_prepare_4d_causal_attention_mask` a leaf function in the FX graph.
 # It means that the function will not be traced through and simply appear as a node in the graph.
 if is_torch_fx_available():
-    if not is_torch_greater_or_equal_than_1_13:
-        import torch.fx
-
     _prepare_4d_causal_attention_mask = torch.fx.wrap(_prepare_4d_causal_attention_mask)
 
 from .configuration_minimax_text_01 import MiniMaxText01Config