code: def get_ndarray_from_b64(self, b64str):
      b = base64.b64decode(b64str)
      a = pa.BufferReader(b)
      c = a.read_buffer()
      myreader = pa.ipc.open_stream(c)
      r = [i for i in myreader]
      assert len(r) > 0
      if len(r) == 1:
          return self.get_ndarray_from_record_batch(r[0])
      else:
          l = []
          for ele in r:
              l.append(self.get_ndarray_from_record_batch(ele))
          return l
  
imports: import redis
  import time
  from zoo.serving.schema import *
  import httpx
  import json
  import uuid
label_desc: Use image node_id 5 for calling the OutputQueue obj's underlying member method code with example usage: obj.get_ndarray_from_b64(b64str) and returns: self, l