code: def _backend_reset_gradient_accumulators(self):
      for g_acc in self._accumulated_gradients:
          g_acc.assign(np.zeros(g_acc.shape, dtype=g_acc.dtype))
  
imports: import re
  import warnings
  import numpy
  from keras import backend
  from keras import initializers
  from keras import ops
  from keras.optimizers.schedules import learning_rate_schedule
  from keras.saving import serialization_lib
  from keras.utils import tracking
  from keras.utils.naming import auto_name
label_desc: Use image node_id 18 for calling the BaseOptimizer obj's underlying member method code with example usage: obj._backend_reset_gradient_accumulators() without return types