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data_worker.py
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executable file
·37 lines (31 loc) · 1.12 KB
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import threading
import queue
import time
class AsyncWorker(threading.Thread):
def __init__(self, dataloaders, dataset_picker):
threading.Thread.__init__(self)
self.req_queue = queue.Queue()
self.ret_queue = queue.Queue()
self.dataloaders = dataloaders
self.dataset_picker = dataset_picker
self.prefetch_idx = 3
for i in range(self.prefetch_idx):
self.req_queue.put(dataset_picker[i])
def run(self):
while True:
dataset_type = self.req_queue.get(block=True)
if dataset_type is None:
break
batch = next(self.dataloaders[dataset_type])
self.req_queue.task_done()
self.ret_queue.put(batch)
def get(self):
batch = self.ret_queue.get()
self.ret_queue.task_done()
return batch
def prefetch(self):
if self.prefetch_idx < len(self.dataset_picker):
self.req_queue.put(self.dataset_picker[self.prefetch_idx])
self.prefetch_idx += 1
def stop(self):
self.req_queue.put(None)