.

custom_models/gpt2/__init__.py

@@ -0,0 +1 @@
+from .modeling_gpt2 import GPT2LMHeadModel, GPT2Model

custom_models/gpt2/modeling_gpt2.py

@@ -5,11 +5,13 @@ from typing import Any, Dict, Optional, Tuple, Union
 import torch
 import torch.utils.checkpoint
 import transformers
+from torch import nn
 from transformers.modeling_outputs import BaseModelOutputWithPastAndCrossAttentions
-from transformers.models.gpt2 import (
+from transformers.models.gpt2.modeling_gpt2 import (
     _CHECKPOINT_FOR_DOC,
     _CONFIG_FOR_DOC,
     GPT2_INPUTS_DOCSTRING,
+    logger,
 )
 from transformers.utils import (
     ModelOutput,
@@ -260,6 +262,18 @@ class GPT2Model(transformers.models.gpt2.GPT2Model):
 
 
 class GPT2LMHeadModel(transformers.models.gpt2.GPT2LMHeadModel):
+    def __init__(self, config):
+        super().__init__(config)
+        self.transformer = GPT2Model(config)
+        self.lm_head = nn.Linear(config.n_embd, config.vocab_size, bias=False)
+
+        # Model parallel
+        self.model_parallel = False
+        self.device_map = None
+
+        # Initialize weights and apply final processing
+        self.post_init()
+
     def prepare_inputs_for_generation(
         self, input_ids, past_key_values=None, inputs_embeds=None, **kwargs
     ):