code: def read_unswapped_gradients(self, dest_buffer):
      num_elem_count = 0
      for offset, grad_partition in self.unswapped_gradients.items():
          dst_tensor = dest_buffer.narrow(
              0, offset, grad_partition.numel()
          )
          dst_tensor.data.copy_(grad_partition.data)
          num_elem_count += grad_partition.numel()
  
      return num_elem_count
  
imports: import os
  import torch
  from deepspeed import comm
  from deepspeed.utils.logging import logger
  from deepspeed.runtime.swap_tensor.constants import *
  from deepspeed.runtime.swap_tensor.utils import swap_in_tensors, swap_out_tensors, MIN_AIO_BYTES, AIO_ALIGNED_BYTES, get_sized_buffers
  from deepspeed.runtime.swap_tensor.utils import SwapBufferManager, SwapBufferPool
  from deepspeed.accelerator import get_accelerator
label_desc: Use image node_id 14 for calling the OptimizerStateSwapInfo obj's underlying member method code with example usage: obj.read_unswapped_gradients(dest_buffer) and returns: num_elem_count