'Initialization. Currently only support amortized tracking.
Args:
total_examples: total number of examples.'

def __init__(self, total_examples):

    assert (total_examples > 0)
    self._total_examples = total_examples
    self._eps_squared_sum = tf.Variable(tf.zeros([1]), trainable=False, name='eps_squared_sum')
    self._delta_sum = tf.Variable(tf.zeros([1]), trainable=False, name='delta_sum')
