class_docstr: Override GPT2LMHeadModel to allow for prefix conditioning.
code: def store_prefix_emb(self, prefix_emb):
      self.cached_prefix_emb = prefix_emb
  
file_path: TTS/TTS/tts/layers/xtts/gpt_inference.py
imports: import math
  import torch
  from torch import nn
  from transformers import GPT2PreTrainedModel
  from transformers.modeling_outputs import CausalLMOutputWithCrossAttentions
label_desc: Use image node_id 2 for calling the GPT2InferenceModel obj's underlying member method code with example usage: obj.store_prefix_emb(prefix_emb) without return types