[Question] ValueError: ndarray is not C-contiguous

[zichunxx]

Question

Hi! I'm trying to build a training process with image input but met the memory leak problem.

Thus, I want to increase memory efficiency using the FrameStack wrapper with lz4_compress=True.

However, I met ValueError: ndarray is not C-contiguous after wrapping the env with the following code.

import gymnasium as gym
from gymnasium.wrappers import PixelObservationWrapper, RescaleAction, FrameStack
from gymnasium.experimental.wrappers import PixelObservationV0

env = gym.make("Humanoid-v4", render_mode="rgb_array")
env = PixelObservationV0(env, pixels_only=True)
env = RescaleAction(env, min_action=-1.0, max_action=1.0)
env = FrameStack(env, num_stack=frame_stack, lz4_compress=True)
obs, info = env.reset()

Is copy(order='C') missed at this line? Thanks!

Update:

It seems that LazyFrames has been removed after v0.29.1. Why did this class be removed?

[pseudo-rnd-thoughts]

We removed LazyFrame as from my experience it caused more issues and that lazy frame should happen at the replay buffer level not FrameStack level

[zichunxx]

Could you please offer some examples with LazyFrame at the replay buffer level? Thanks.

[pseudo-rnd-thoughts]

I'm not aware of any publicly, I have a friend making one but it is still in the process.