import os import pickle import torch from mamba_lm import MambaLMConfig, from_pretrained from mamba_ssm import MambaLMHeadModel from contextlib import nullcontext BASE_DIR = "mamba/" class MambaPlayer: def __init__(self, model_name: str, move_num_in_gamestate: bool=False): self.model_name = model_name self.move_num_in_gamestate = move_num_in_gamestate # ----------------------------------------------------------------------------- init_from = "resume" # either 'resume' or a Mamba variant (e.g. 'state-spaces/mamba-1.4b') out_dir = "out" # ignored if init_from is not 'resume' device = "cuda" if torch.cuda.is_available() else "cpu" #device = "cpu" dtype = 'bfloat16' if torch.cuda.is_bf16_supported() else 'float32' seed = 1337 compile = False # set to True if using PyTorch 2.0 and Mamba supports it # ----------------------------------------------------------------------------- torch.manual_seed(seed) torch.cuda.manual_seed(seed) device_type = ( "cuda" if "cuda" in device else "cpu" ) # for later use in torch.autocast ptdtype = { "float32": torch.float32, "bfloat16": torch.bfloat16, "float16": torch.float16, }[dtype] ctx = ( nullcontext() if device_type == "cpu" else torch.amp.autocast(device_type=device_type, dtype=ptdtype) ) # Model initialization if init_from == "resume": #ckpt_path = os.path.join(BASE_DIR, out_dir, self.model_name) ckpt_path = os.path.normpath(f"../chess-mamba-vs-xformer/out/Mamba/{self.model_name}") checkpoint = torch.load(ckpt_path, map_location=device) model_config = checkpoint["model_args"] model = MambaLMHeadModel(model_config) model.load_state_dict(checkpoint['model']) elif init_from.startswith('state-spaces'): model = from_pretrained(init_from).to(device) else: raise ValueError("Invalid init_from value") model.eval() model.to(device) if compile and hasattr(torch, 'compile'): model = torch.compile(model) # look for the meta pickle in case it is available in the dataset folder meta_path = os.path.join(BASE_DIR, "out", "meta.pkl") load_meta = os.path.exists(meta_path) if move_num_in_gamestate and load_meta: with open(meta_path, "rb") as f: meta = pickle.load(f) stoi, itos = meta["stoi"], meta["itos"] vocab_size = meta['vocab_size'] encode = lambda s: [stoi[c] for c in s] decode = lambda l: "".join([itos[i] for i in l]) else: stoi = {' ': 0, '.': 1, 'a': 2, 'b': 3, 'c': 4, 'd': 5, 'e': 6, 'f': 7, 'g': 8, 'h': 9, '1': 10, '2': 11, '3': 12, '4': 13, '5': 14, '6': 15, '7': 16, '8': 17, 'B': 18, 'N': 19, 'R': 20, 'Q': 21, 'K': 22, 'O': 23, 'x': 24, '+': 25, '#': 26, '=': 27} itos = {0: ' ', 1: '.', 2: 'a', 3: 'b', 4: 'c', 5: 'd', 6: 'e', 7: 'f', 8: 'g', 9: 'h', 10: '1', 11: '2', 12: '3', 13: '4', 14: '5', 15: '6', 16: '7', 17: '8', 18: 'B', 19: 'N', 20: 'R', 21: 'Q', 22: 'K', 23: 'O', 24: 'x', 25: '+', 26: '#', 27: '='} for s in stoi: assert itos[stoi[s]] == s vocab_size = len(stoi) print(f"Vocab size {vocab_size}") encode = lambda s: [stoi[c] for c in s.replace('-', '')] decode = lambda l: "".join([itos[i] for i in l if i < vocab_size]).replace("OOO", "O-O-O").replace("OO", "O-O") self.vocab_size = vocab_size self.encode = encode self.decode = decode self.space_tok = encode(' ')[0] self.dot_tok = encode('.')[0] self.model = model self.ctx = ctx self.device = device def get_mamba_response(self, game_state: str, temperature: float, max_new_tokens: int, top_k: int): game_state = game_state.split("\n\n")[-1].strip() #game_state = ";" + game_state # Tokenize the game state encoded_prompt = self.encode(game_state) input_ids = torch.tensor([encoded_prompt], dtype=torch.long, device=self.device) self.model.eval() # Set the model to evaluation mode with torch.no_grad(): have_non_space = False for _ in range(max_new_tokens): logits = self.model(input_ids).logits[0, -1, :] # Get logits for the last token # Apply temperature scaling and optionally sample from top k tokens logits = logits / temperature if top_k > 0: indices_to_remove = logits < torch.topk(logits, top_k)[0][..., -1, None] logits[indices_to_remove] = -float('Inf') probs = torch.nn.functional.softmax(logits, dim=-1) next_token_id = torch.multinomial(probs, num_samples=1) if next_token_id == self.space_tok or next_token_id==self.dot_tok: if have_non_space: break else: have_non_space = True input_ids = torch.cat([input_ids, next_token_id.unsqueeze(0)], dim=1) model_response = self.decode(input_ids[0].tolist()) model_response = model_response[len(game_state):].split(";")[0] return model_response #def encode(self, text: str): # Implement the appropriate tokenization for MambaLM # This could be a simple mapping or a more complex tokenizer # return [stoi[char] for char in text] # Example #def decode(self, token_ids: list): # Implement the appropriate decoding for MambaLM # return ''.join([itos[id] for id in token_ids]) # Example def get_move_from_response(self, response: str) -> str: if not response or len(response) == 0: return None # Parse the response to get only the first move try: moves = response.split() first_move = moves[0] first_move = first_move.lstrip('.') # A patch for a weird phase during training ... doesn't seem to be an issue anymore, but don't see the harm. return first_move except: return None def get_move(self, board: str, game_state: str, temperature: float) -> str: completion = self.get_mamba_response(game_state, temperature, 8, self.vocab_size) return self.get_move_from_response(completion) def get_config(self) -> dict: return {"model": self.model_name}