mirror of
https://github.com/vale981/ray
synced 2025-03-07 02:51:39 -05:00
42 lines
1.2 KiB
Python
42 lines
1.2 KiB
Python
|
import logging
|
||
|
|
import random
|
||
|
|
|
||
|
|
from ray.rllib.offline.input_reader import InputReader
|
||
|
|
from ray.rllib.utils.annotations import override, DeveloperAPI
|
||
|
|
|
||
|
|
logger = logging.getLogger(__name__)
|
||
|
|
|
||
|
|
|
||
|
|
@DeveloperAPI
|
||
|
|
class ShuffledInput(InputReader):
|
||
|
|
"""Randomizes data over a sliding window buffer of N batches.
|
||
|
|
|
||
|
|
This increases the randomization of the data, which is useful if the
|
||
|
|
batches were not in random order to start with.
|
||
|
|
"""
|
||
|
|
|
||
|
|
@DeveloperAPI
|
||
|
|
def __init__(self, child, n=0):
|
||
|
|
"""Initialize a MixedInput.
|
||
|
|
|
||
|
|
Arguments:
|
||
|
|
child (InputReader): child input reader to shuffle.
|
||
|
|
n (int): if positive, shuffle input over this many batches.
|
||
|
|
"""
|
||
|
|
self.n = n
|
||
|
|
self.child = child
|
||
|
|
self.buffer = []
|
||
|
|
|
||
|
|
@override(InputReader)
|
||
|
|
def next(self):
|
||
|
|
if self.n <= 1:
|
||
|
|
return self.child.next()
|
||
|
|
if len(self.buffer) < self.n:
|
||
|
|
logger.info("Filling shuffle buffer to {} batches".format(self.n))
|
||
|
|
while len(self.buffer) < self.n:
|
||
|
|
self.buffer.append(self.child.next())
|
||
|
|
logger.info("Shuffle buffer filled")
|
||
|
|
i = random.randint(0, len(self.buffer) - 1)
|
||
|
|
self.buffer[i] = self.child.next()
|
||
|
|
return random.choice(self.buffer)
|