code: def backward(ctx, dY):
      cos, sin = ctx.saved_tensors
      # Q * cos + rotate_half.T(Q) * sin
      half = dY.shape[-1] // 2
      RH_dY = torch.cat((dY[..., half:], -dY[..., :half]), dim=-1)
      dY *= cos
      RH_dY *= sin
      dY += RH_dY
      return dY, None, 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 Slow_RoPE_Embedding obj's underlying member method code with example usage: obj.backward(ctx, dY) and returns: dY,  None,  None,  None