class_docstr: Replay Buffers for loading existing data.
code: def replay_capacity(self):
      return self._replay_buffers[0]._replay_capacity
  
file_path: dopamine/dopamine/labs/offline_rl/fixed_replay.py
imports: from absl import logging
  from batch_rl.fixed_replay.replay_memory import fixed_replay_buffer
  from dopamine.replay_memory import circular_replay_buffer
  import gin
  import numpy
  import tensorflow
label_desc: Use image node_id 3 for calling the JaxFixedReplayBuffer obj's underlying member method code with example usage: obj.replay_capacity() and returns: self