Thanks for the nice project.
Have you tried using the default qtransform_completed_by_mix_value for the gumbel_muzero_policy?

The qtransform_by_min_max gives zero values to unvisited actions. That does not have a good theoretical justification.

Hello Mr NTT,
Can I contact you directly? It's about AlphaZero.
My email is [email protected]

I've encountered a containerization issue when tried to implement a new environment that calls external application for game logic. I would need to call in step to get a new state, but at this point action is batched tracer so I can't extract it's value with call because batched input doesn't implement it.

class CheckersGame(Environment):
    ...

    def _step(self, action: chex.Array) -> Tuple["CheckersGame", chex.Array]:
        action = self._prepare_action(action) # get a concrete value of action
        new_state, reward = call_external_env(action)
        return self, jnp.array(reward, dtype=jnp.int32)

    @pax.pure
    def step(self, action: chex.Array) -> Tuple["CheckersGame", chex.Array]:
        # batched action comes in, but concrete value is required
        env, reward = jax.vmap(lambda a: self._step(a))(action.reshape(-1, 1))
        return self, reward

    ...

I can tap into action with id_print, id_tap here, but can't block _step that way.

What's correct way to do that?

On a budget, I'm running the training_agent for Caro on Colab with TPU.
However, somehow it always got killed at iteration #1 around 64% without much stacktraces provided.

Any experiences or theories on why this may happen?

!TF_CPP_MIN_LOG_LEVEL=0
!time python3 train_agent.py \
    --game-class="caro_game.CaroGame" \
    --agent-class="resnet_policy.ResnetPolicyValueNet128" \
    --selfplay-batch-size=1024 \
    --training-batch-size=1024 \
    --num-simulations-per-move=32 \
    --num-self-plays-per-iteration=102400 \
    --learning-rate=1e-2 \
    --random-seed=42 \
    --ckpt-filename="./caro_agent_9x9_128.ckpt" \
    --num-iterations=100 \
    --lr-decay-steps=500000

2022-11-25 08:59:37.077139: E external/org_tensorflow/tensorflow/compiler/xla/stream_executor/cuda/cuda_driver.cc:267] failed call to cuInit: CUDA_ERROR_NO_DEVICE: no CUDA-capable device is detected
Cores: [TpuDevice(id=0, process_index=0, coords=(0,0,0), core_on_chip=0), TpuDevice(id=1, process_index=0, coords=(0,0,0), core_on_chip=1), TpuDevice(id=2, process_index=0, coords=(1,0,0), core_on_chip=0), TpuDevice(id=3, process_index=0, coords=(1,0,0), core_on_chip=1), TpuDevice(id=4, process_index=0, coords=(0,1,0), core_on_chip=0), TpuDevice(id=5, process_index=0, coords=(0,1,0), core_on_chip=1), TpuDevice(id=6, process_index=0, coords=(1,1,0), core_on_chip=0), TpuDevice(id=7, process_index=0, coords=(1,1,0), core_on_chip=1)]
Loading weights at ./caro_agent_9x9_128.ckpt
Iteration 1
self play [######################--------------] 63% 00:09:41 /bin/bash: line 1: 2377 Killed python3 train_agent.py --game-class="caro_game.CaroGame" --agent-class="resnet_policy.ResnetPolicyValueNet128" --selfplay-batch-size=1024 --training-batch-size=1024 --num-simulations-per-move=32 --num-self-plays-per-iteration=102400 --learning-rate=1e-2 --random-seed=42 --ckpt-filename="./caro_agent_9x9_128.ckpt" --num-iterations=100 --lr-decay-steps=500000

real 17m19.797s
user 10m5.645s
sys 5m3.467s

Hi,

We have the winning condititons identified:

I think we might have missed winning by 3 in a row in the middle (vertically and horizontally), i.e., with spaces 1 , 4 7 (vertical) and 3, 5 6 (horizontal)

I have no idea how to fix this in your code :( sorry!

the 9x9 go agent is pretty strong! how many iterations was it trained on? how long does it take to train (i saw it's on TPUs)?

I've implemented a game which doesn't have a strictly alternating turn order (some actions change player, others don't). How could this be used in your framework? I think it's the discount, but wanted to check. Should the discount returned be 1 for any action that doesn't change player and -1 otherwise?

It's a great job! I learned a lot in your repo. Where can I find the implementation of Muzero using mctx? Thanks a lot.