'Is my understanding of tensorflow v1 session correct?

I have the following code:

self.sess = tf.Session()
_, self.cost = self.sess.run(
    [self._train_op, self.loss],
    feed_dict={self.s: batch_memory[:, :self.n_features],
    self.q_target: q_target}
)

The order of execution as I understand it is:

self.cost=self.sess.run(
    [self.loss],feed_dict={self.s: batch_memory[:, :self.n_features], self.q_target: q_target})
_=self.sess.run([self._train_op],feed_dict={self.loss:self.cost})

Is my understanding correct?

python tensorflow

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'Is my understanding of tensorflow v1 session correct?

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