code: def compute_gradients(self, samples):
      return self._grad * samples.count, {"batch_count": samples.count}
  
file_path: ray/python/ray/rllib/tests/mock_worker.py
imports: import numpy
  import ray
  from ray.rllib.evaluation.worker_set import WorkerSet
  from ray.rllib.policy.sample_batch import SampleBatch
  from ray.rllib.utils.filter import MeanStdFilter
label_desc: Use image node_id 3 for calling the _MockWorker obj's underlying member method code with example usage: obj.compute_gradients(samples) and returns: unknown,  dict