code: def test_reverse_packed_segs(self, data, gc, dc):
      max_length = data.shape[0]
      batch_size = data.shape[1]
      lengths = np.random.randint(max_length + 1, size=batch_size)
  
      op = core.CreateOperator(
          "ReversePackedSegs", ["data", "lengths"], ["reversed_data"]
      )
  
      def op_ref(data, lengths):
          rev_data = np.array(data, copy=True)
          for i in range(batch_size):
              seg_length = lengths[i]
              for j in range(seg_length):
                  rev_data[j][i] = data[seg_length - 1 - j][i]
          return (rev_data,)
  
      def op_grad_ref(grad_out, outputs, inputs):
          return op_ref(grad_out, inputs[1]) + (None,)
  
      self.assertReferenceChecks(
          device_option=gc,
          op=op,
          inputs=[data, lengths],
          reference=op_ref,
          output_to_grad="reversed_data",
          grad_reference=op_grad_ref,
      )
  
imports: from caffe2.python import core
  from functools import partial
  from hypothesis import given, settings
  import caffe2.python.hypothesis_test_util
  import caffe2.python.serialized_test.serialized_test_util
  import hypothesis.strategies
  import numpy
  import unittest
  from caffe2.python import workspace
label_desc: Use image node_id 11 for calling the TestSequenceOps obj's underlying member method code with example usage: obj.test_reverse_packed_segs(data, gc, dc) and returns: rev_data, unknown