Issues

• 5.0 native puffer train hangs at init for CPU-host envs (containerized/virtualized hosts)

  PufferAI/PufferLib#669 · Filter by author IlyaasK opened on Aug 27, 2026

• nmmo3: observation encoder never clears entity bytes — stale "live enemy" claims persist indefinitely

  PufferAI/PufferLib#629 · Filter by author daveey opened on Aug 5, 2026

• 5c MinGRU resets hidden state one step late during training

  PufferAI/PufferLib#622 · Filter by author MischaU8 opened on Jul 24, 2026

• 5c Self-play swaps opponents mid-game

  PufferAI/PufferLib#620 · Filter by author MischaU8 opened on Jul 23, 2026

• 5c Self-play evaluation writes incorrect training metadata (to Constellation)

  PufferAI/PufferLib#619 · Filter by author MischaU8 opened on Jul 23, 2026

• Native 5c self-play saves random weights as the initial checkpoint

  PufferAI/PufferLib#618 · Filter by author MischaU8 opened on Jul 23, 2026

• Default sweep broken for most envs

  PufferAI/PufferLib#589 · Filter by author FrostyFridge opened on Jun 19, 2026
  1

• 17/52 Ocean envs fail to use v4 API

  PufferAI/PufferLib#542 · Filter by author KTibow opened on Apr 27, 2026

• GIF logic unimplemented on v4

  PufferAI/PufferLib#541 · Filter by author KTibow opened on Apr 27, 2026

• BF16 load_weights doesn't reach inference stream — eval produces degenerate action distribution

  PufferAI/PufferLib#534 · Filter by author Infatoshi opened on Apr 20, 2026

• g2048: empty_count stale during tile placement — trained model collapses under correct 2048 rules

  PufferAI/PufferLib#492 · Filter by author InFiNiTeemo opened on Feb 25, 2026
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• g2048 environment: new tile logic is bugged (different from the original)

  PufferAI/PufferLib#491 · Filter by author bbbbbbbbba opened on Feb 25, 2026

• puffer eval/train

  PufferAI/PufferLib#487 · Filter by author elevatorguy opened on Feb 14, 2026

• Invitation to maintain a pufferlib Agent Skill

  PufferAI/PufferLib#456 · Filter by author OrionLi545 opened on Jan 10, 2026

• Incorrect cartpole dynamics

  PufferAI/PufferLib#447 · Filter by author stockeh opened on Jan 1, 2026
  2

• Sweep goes way beyond the suggested time for a single run

  PufferAI/PufferLib#435 · Filter by author BertrandDecoster opened on Dec 7, 2025
  2

• environment.py lazy_import() Seems to be Unused

  PufferAI/PufferLib#374 · Filter by author Kinvert opened on Oct 6, 2025
  4

• env_binding.c env_init Says 5 Args - Seems to Need 6

  PufferAI/PufferLib#373 · Filter by author Kinvert opened on Oct 6, 2025

• Training signal could be improved

  PufferAI/PufferLib#363 · Filter by author jpiabrantes opened on Sep 25, 2025
  2

• Compilation/installation issue

  PufferAI/PufferLib#324 · Filter by author prasuchit opened on Aug 7, 2025

• ARM support

  PufferAI/PufferLib#320 · Filter by author KTibow opened on Aug 3, 2025

• Freeway environment doesn't end episode on collision — is this intended?

  PufferAI/PufferLib#298 · Filter by author asyncs opened on Jul 21, 2025
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• Atari is a funny (broken) environment

  PufferAI/PufferLib#289 · Filter by author KTibow opened on Jul 16, 2025
  3

• Docs missing clarification of shared obs space

  PufferAI/PufferLib#161 · Filter by author jsuarez5341 opened on Feb 10, 2025

• Any update on continuous action spaces

  PufferAI/PufferLib#125 · Filter by author kinalmehta opened on Nov 15, 2024
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