code: def backward(ctx, dY):
      batch, seq_len, n_heads, head_dim = dY.shape
      dY = dY.reshape(batch * seq_len, n_heads * head_dim)
      # Must be reshape not view
      n_rows, n_cols = dY.shape
  
      cos = ctx.cos
      sin = ctx.sin
  
      _rope_embedding[
          (
              n_rows,
              n_heads,
          )
      ](
          dY,
          dY.stride(0),
          cos,
          cos.stride(0),
          sin,
          sin.stride(0),
          seq_len,
          head_dim,
          BACKWARD_PASS=True,
          BLOCK_SIZE=ctx.BLOCK_SIZE,
          num_warps=ctx.num_warps,
      )
      dY = dY.view(batch, seq_len, n_heads, head_dim)
      return (
          dY,
          None,
          None,
      )
  
file_path: unsloth/unsloth/kernels/rope_embedding.py
imports: import triton
  import triton.language
  import torch
  from .utils import calculate_settings
label_desc: Use image node_id 2 for calling the Fast_RoPE_Embedding obj's underlying member method code with example usage: obj.backward(ctx, dY) and returns: dY,  None,  None