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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 _setup(self, inputs):
        logger.info("Setting up the queue for CPU prefetching ...")
        self.input_placehdrs = [build_or_reuse_placeholder(v) for v in inputs]
        assert len(self.input_placehdrs) > 0, \
            "BatchQueueInput has to be used with some input signature!"

        # prepare placeholders without the first dimension
        placehdrs_nobatch = []
        for p in self.input_placehdrs:
            placehdrs_nobatch.append(tfv1.placeholder(
                dtype=p.dtype, shape=p.get_shape().as_list()[1:],
                name=get_op_tensor_name(p.name)[0] + '-nobatch'))

        # dequeue_many requires fully-defined shapes
        shape_err = "Use of BatchQueueInput requires inputs to have fully-defined "
        "shapes except for the batch dimension"
        shapes = []
        for p in placehdrs_nobatch:
            assert p.get_shape().is_fully_defined(), shape_err
            shapes.append(p.get_shape())

        with self.cached_name_scope():
            if self.queue is None:
                self.queue = tf.FIFOQueue(
                    3000, [x.dtype for x in self.input_placehdrs],
                    shapes=shapes,
                    name='input_queue')
            for shp in self.queue.shapes:
                assert shp.is_fully_defined(), shape_err

            self.thread = EnqueueThread(self.queue, self._inf_ds, placehdrs_nobatch)