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Stop caching the result of numpy.concatenate in LazyFrames #332

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Oct 25, 2018
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Stop caching the result of numpy.concatenate in LazyFrames #332

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15 changes: 1 addition & 14 deletions examples/ale/atari_wrappers.py
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Original file line number Diff line number Diff line change
Expand Up @@ -230,26 +230,13 @@ class LazyFrames(object):
def __init__(self, frames, stack_axis=2):
self.stack_axis = stack_axis
self._frames = frames
self._out = None

def _force(self):
if self._out is None:
self._out = np.concatenate(self._frames, axis=self.stack_axis)
self._frames = None
return self._out

def __array__(self, dtype=None):
out = self._force()
out = np.concatenate(self._frames, axis=self.stack_axis)
if dtype is not None:
out = out.astype(dtype)
return out

def __len__(self):
return len(self._force())

def __getitem__(self, i):
return self._force()[i]


def make_atari(env_id):
env = gym.make(env_id)
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