Fetch a batch of data without waiting

def fetch_batch(self):
        """ Fetch a batch of data without waiting"""
        inp, f = self.queue.get()
        nr_input_var = len(inp)
        batched, futures = [[] for _ in range(nr_input_var)], []
        for k in range(nr_input_var):
            batched[k].append(inp[k])
        futures.append(f)
        while len(futures) < self.batch_size:
            try:
                inp, f = self.queue.get_nowait()
                for k in range(nr_input_var):
                    batched[k].append(inp[k])
                futures.append(f)
            except queue.Empty:
                break   # do not wait

        for k in range(nr_input_var):
            batched[k] = np.asarray(batched[k])
        return batched, futures