code: def set_rand_params(self, params):
      params_dict = {}
      for param, values in params.items():
          if param == "dtype" and values == ALL_POSSIBLE_VALUES:
              dtype_val = np.random.choice(
                  [True, self._current_buffer.dtypes.to_dict()]
              )
              params_dict[param] = _get_dtype_param_value(dtype_val)
          else:
              params_dict[param] = np.random.choice(values)
      self._current_params["test_kwargs"] = self.process_kwargs(
          params_dict
      )
  
imports: import logging
  import random
  from collections import abc
  import numpy
  import cudf
  from cudf._fuzz_testing.io import IOFuzz
  from cudf._fuzz_testing.utils import ALL_POSSIBLE_VALUES, _generate_rand_meta, pyarrow_to_pandas
  from cudf.testing import dataset_generator
  from cudf.utils.dtypes import pandas_dtypes_to_np_dtypes
label_desc: Use image node_id 4 for calling the JSONReader obj's underlying member method code with example usage: obj.set_rand_params(params) without return types