code: def __init__(self, n_heads: int, n_ctx: int):
      super().__init__()
      self.n_heads = n_heads
      self.n_ctx = n_ctx
  
imports: import math
  import torch
  import torch.nn
  import torch.nn.functional
  from .nn import timestep_embedding
label_desc: Use image node_id 1 to create a new QKVMultiheadAttention object from inherited base classes: nn with example: obj = QKVMultiheadAttention(n_heads, n_ctx)