[BugFix] Temporarily set lazy legacy to True (#1840)

Author: Vincent Moens

torchrl/__init__.py

@@ -7,8 +7,12 @@
 
 import torch
 
+from tensordict import set_lazy_legacy
+
 from torch import multiprocessing as mp
 
+set_lazy_legacy(True).set()
+
 if torch.cuda.device_count() > 1:
     n = torch.cuda.device_count() - 1
     os.environ["MUJOCO_EGL_DEVICE_ID"] = str(1 + (os.getpid() % n))