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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def reset(self):
 """Reset the estimates of mean and variance. Resets the full state of this class. Returns: Operation. """

    with tf.name_scope(self._name + '/reset'):
      return tf.group(
          self._count.assign(0),
          self._mean.assign(tf.zeros_like(self._mean)),
          self._var_sum.assign(tf.zeros_like(self._var_sum)))