Delete model.py

model.py

@@ -1,387 +0,0 @@
-import math
-import struct
-import inspect
-import time
-
-from .LMConfig import LMConfig
-from typing import Any, Optional, Tuple, List, Union
-import numpy as np
-import torch
-import torch.nn.functional as F
-from torch import nn
-from transformers import PreTrainedModel
-from transformers.modeling_outputs import CausalLMOutputWithPast
-
-
-class RMSNorm(torch.nn.Module):
-    def __init__(self, dim: int, eps: float = 1e-6):
-        super().__init__()
-        self.eps = eps
-        self.weight = nn.Parameter(torch.ones(dim))
-
-    def _norm(self, x):
-        return x * torch.rsqrt(x.pow(2).mean(-1, keepdim=True) + self.eps)
-
-    def forward(self, x):
-        return self.weight * self._norm(x.float()).type_as(x)
-
-
-def precompute_pos_cis(dim: int, end: int = int(32 * 1024), theta: float = 1e6):
-    freqs = 1.0 / (theta ** (torch.arange(0, dim, 2)[: (dim // 2)].float() / dim))
-    t = torch.arange(end, device=freqs.device)  # type: ignore
-    freqs = torch.outer(t, freqs).float()  # type: ignore
-    pos_cis = torch.polar(torch.ones_like(freqs), freqs)  # complex64
-    return pos_cis
-
-
-def apply_rotary_emb(xq, xk, pos_cis):
-    def unite_shape(pos_cis, x):
-        ndim = x.ndim
-        assert 0 <= 1 < ndim
-        assert pos_cis.shape == (x.shape[1], x.shape[-1])
-        shape = [d if i == 1 or i == ndim - 1 else 1 for i, d in enumerate(x.shape)]
-        return pos_cis.view(*shape)
-
-    xq_ = torch.view_as_complex(xq.float().reshape(*xq.shape[:-1], -1, 2))
-    xk_ = torch.view_as_complex(xk.float().reshape(*xk.shape[:-1], -1, 2))
-    pos_cis = unite_shape(pos_cis, xq_)
-    xq_out = torch.view_as_real(xq_ * pos_cis).flatten(3)
-    xk_out = torch.view_as_real(xk_ * pos_cis).flatten(3)
-    return xq_out.type_as(xq), xk_out.type_as(xk)
-
-
-def repeat_kv(x: torch.Tensor, n_rep: int) -> torch.Tensor:
-    """torch.repeat_interleave(x, dim=2, repeats=n_rep)"""
-    bs, slen, n_kv_heads, head_dim = x.shape
-    if n_rep == 1:
-        return x
-    return (
-        x[:, :, :, None, :]
-        .expand(bs, slen, n_kv_heads, n_rep, head_dim)
-        .reshape(bs, slen, n_kv_heads * n_rep, head_dim)
-    )
-
-
-class Attention(nn.Module):
-    def __init__(self, args: LMConfig):
-        super().__init__()
-        self.n_kv_heads = args.n_heads if args.n_kv_heads is None else args.n_kv_heads
-        assert args.n_heads % self.n_kv_heads == 0
-        self.n_local_heads = args.n_heads
-        self.n_local_kv_heads = self.n_kv_heads
-        self.n_rep = self.n_local_heads // self.n_local_kv_heads
-        self.head_dim = args.dim // args.n_heads
-        self.wq = nn.Linear(args.dim, args.n_heads * self.head_dim, bias=False)
-        self.wk = nn.Linear(args.dim, self.n_kv_heads * self.head_dim, bias=False)
-        self.wv = nn.Linear(args.dim, self.n_kv_heads * self.head_dim, bias=False)
-        self.wo = nn.Linear(args.n_heads * self.head_dim, args.dim, bias=False)
-        self.attn_dropout = nn.Dropout(args.dropout)
-        self.resid_dropout = nn.Dropout(args.dropout)
-        self.dropout = args.dropout
-        self.flash = hasattr(torch.nn.functional, 'scaled_dot_product_attention') and args.flash_attn
-        # print("WARNING: using slow attention. Flash Attention requires PyTorch >= 2.0")
-        mask = torch.full((1, 1, args.max_seq_len, args.max_seq_len), float("-inf"))
-        mask = torch.triu(mask, diagonal=1)
-        self.register_buffer("mask", mask, persistent=False)
-
-    def forward(self,
-                x: torch.Tensor,
-                pos_cis: torch.Tensor,
-                past_key_value: Optional[Tuple[torch.Tensor, torch.Tensor]] = None,
-                use_cache=False):
-        bsz, seq_len, _ = x.shape
-        xq, xk, xv = self.wq(x), self.wk(x), self.wv(x)
-        xq = xq.view(bsz, seq_len, self.n_local_heads, self.head_dim)
-        xk = xk.view(bsz, seq_len, self.n_local_kv_heads, self.head_dim)
-        xv = xv.view(bsz, seq_len, self.n_local_kv_heads, self.head_dim)
-
-        xq, xk = apply_rotary_emb(xq, xk, pos_cis)
-        # kv_cache实现
-        if past_key_value is not None:
-            xk = torch.cat([past_key_value[0], xk], dim=1)
-            xv = torch.cat([past_key_value[1], xv], dim=1)
-        past_kv = (xk, xv) if use_cache else None
-
-        xq, xk, xv = (
-            xq.transpose(1, 2),
-            repeat_kv(xk, self.n_rep).transpose(1, 2),
-            repeat_kv(xv, self.n_rep).transpose(1, 2)
-        )
-        if self.flash and seq_len != 1:
-            dropout_p = self.dropout if self.training else 0.0
-            output = F.scaled_dot_product_attention(
-                xq, xk, xv,
-                attn_mask=None,
-                dropout_p=dropout_p,
-                is_causal=True
-            )
-        else:
-            scores = (xq @ xk.transpose(-2, -1)) / math.sqrt(self.head_dim)
-            scores += self.mask[:, :, :seq_len, :seq_len]
-            scores = F.softmax(scores.float(), dim=-1).type_as(xq)
-            scores = self.attn_dropout(scores)
-            output = scores @ xv
-
-        output = output.transpose(1, 2).reshape(bsz, seq_len, -1)
-        output = self.resid_dropout(self.wo(output))
-        return output, past_kv
-
-
-class FeedForward(nn.Module):
-    def __init__(self, config: LMConfig):
-        super().__init__()
-        if config.hidden_dim is None:
-            hidden_dim = 4 * config.dim
-            hidden_dim = int(2 * hidden_dim / 3)
-            config.hidden_dim = config.multiple_of * ((hidden_dim + config.multiple_of - 1) // config.multiple_of)
-        self.w1 = nn.Linear(config.dim, config.hidden_dim, bias=False)
-        self.w2 = nn.Linear(config.hidden_dim, config.dim, bias=False)
-        self.w3 = nn.Linear(config.dim, config.hidden_dim, bias=False)
-        self.dropout = nn.Dropout(config.dropout)
-
-    def forward(self, x):
-        return self.dropout(self.w2(F.silu(self.w1(x)) * self.w3(x)))
-
-
-class MoEGate(nn.Module):
-    def __init__(self, config: LMConfig):
-        super().__init__()
-        self.config = config
-        self.top_k = config.num_experts_per_tok
-        self.n_routed_experts = config.n_routed_experts
-
-        self.scoring_func = config.scoring_func
-        self.alpha = config.aux_loss_alpha
-        self.seq_aux = config.seq_aux
-
-        self.norm_topk_prob = config.norm_topk_prob
-        self.gating_dim = config.dim
-        self.weight = nn.Parameter(torch.empty((self.n_routed_experts, self.gating_dim)))
-        self.reset_parameters()
-
-    def reset_parameters(self) -> None:
-        import torch.nn.init as init
-        init.kaiming_uniform_(self.weight, a=math.sqrt(5))
-
-    def forward(self, hidden_states):
-        bsz, seq_len, h = hidden_states.shape
-        hidden_states = hidden_states.view(-1, h)
-        logits = F.linear(hidden_states, self.weight, None)
-        if self.scoring_func == 'softmax':
-            scores = logits.softmax(dim=-1)
-        else:
-            raise NotImplementedError(f'insupportable scoring function for MoE gating: {self.scoring_func}')
-
-        topk_weight, topk_idx = torch.topk(scores, k=self.top_k, dim=-1, sorted=False)
-
-        if self.top_k > 1 and self.norm_topk_prob:
-            denominator = topk_weight.sum(dim=-1, keepdim=True) + 1e-20
-            topk_weight = topk_weight / denominator
-
-        if self.training and self.alpha > 0.0:
-            scores_for_aux = scores
-            aux_topk = self.top_k
-            topk_idx_for_aux_loss = topk_idx.view(bsz, -1)
-            if self.seq_aux:
-                scores_for_seq_aux = scores_for_aux.view(bsz, seq_len, -1)
-                ce = torch.zeros(bsz, self.n_routed_experts, device=hidden_states.device)
-                ce.scatter_add_(1, topk_idx_for_aux_loss,
-                                torch.ones(bsz, seq_len * aux_topk, device=hidden_states.device)).div_(
-                    seq_len * aux_topk / self.n_routed_experts)
-                aux_loss = (ce * scores_for_seq_aux.mean(dim=1)).sum(dim=1).mean() * self.alpha
-            else:
-                mask_ce = F.one_hot(topk_idx_for_aux_loss.view(-1), num_classes=self.n_routed_experts)
-                ce = mask_ce.float().mean(0)
-                Pi = scores_for_aux.mean(0)
-                fi = ce * self.n_routed_experts
-                aux_loss = (Pi * fi).sum() * self.alpha
-        else:
-            aux_loss = 0
-        return topk_idx, topk_weight, aux_loss
-
-
-class MOEFeedForward(nn.Module):
-    def __init__(self, config: LMConfig):
-        super().__init__()
-        self.config = config
-        self.experts = nn.ModuleList([
-            FeedForward(config)
-            for _ in range(config.n_routed_experts)
-        ])
-        self.gate = MoEGate(config)
-        if config.n_shared_experts is not None:
-            self.shared_experts = FeedForward(config)
-
-    def forward(self, x):
-        identity = x
-        orig_shape = x.shape
-        bsz, seq_len, _ = x.shape
-        # 使用门控机制选择专家
-        topk_idx, topk_weight, aux_loss = self.gate(x)
-        x = x.view(-1, x.shape[-1])
-        flat_topk_idx = topk_idx.view(-1)
-        if self.training:
-            # 训练模式下，重复输入数据
-            x = x.repeat_interleave(self.config.num_experts_per_tok, dim=0)
-            y = torch.empty_like(x, dtype=torch.float16)
-            for i, expert in enumerate(self.experts):
-                y[flat_topk_idx == i] = expert(x[flat_topk_idx == i]).to(y.dtype)  # 确保类型一致
-            y = (y.view(*topk_weight.shape, -1) * topk_weight.unsqueeze(-1)).sum(dim=1)
-            y = y.view(*orig_shape)
-        else:
-            # 推理模式下，只选择最优专家
-            y = self.moe_infer(x, flat_topk_idx, topk_weight.view(-1, 1)).view(*orig_shape)
-        if self.config.n_shared_experts is not None:
-            y = y + self.shared_experts(identity)
-        self.aux_loss = aux_loss
-        return y
-
-    @torch.no_grad()
-    def moe_infer(self, x, flat_expert_indices, flat_expert_weights):
-        expert_cache = torch.zeros_like(x)
-        idxs = flat_expert_indices.argsort()
-        tokens_per_expert = flat_expert_indices.bincount().cpu().numpy().cumsum(0)
-        token_idxs = idxs // self.config.num_experts_per_tok
-        # 例如当tokens_per_expert=[6, 15, 20, 26, 33, 38, 46, 52]
-        # 当token_idxs=[3, 7, 19, 21, 24, 25,  4,  5,  6, 10, 11, 12...]
-        # 意味着当token_idxs[:6] -> [3,  7, 19, 21, 24, 25,  4]位置的token都由专家0处理，token_idxs[6:15]位置的token都由专家1处理......
-        for i, end_idx in enumerate(tokens_per_expert):
-            start_idx = 0 if i == 0 else tokens_per_expert[i - 1]
-            if start_idx == end_idx:
-                continue
-            expert = self.experts[i]
-            exp_token_idx = token_idxs[start_idx:end_idx]
-            expert_tokens = x[exp_token_idx]
-            expert_out = expert(expert_tokens).to(expert_cache.dtype)
-            expert_out.mul_(flat_expert_weights[idxs[start_idx:end_idx]])
-            # 使用 scatter_add_ 进行 sum 操作
-            expert_cache.scatter_add_(0, exp_token_idx.view(-1, 1).repeat(1, x.shape[-1]), expert_out)
-
-        return expert_cache
-
-
-class MiniMindBlock(nn.Module):
-    def __init__(self, layer_id: int, config: LMConfig):
-        super().__init__()
-        self.n_heads = config.n_heads
-        self.dim = config.dim
-        self.head_dim = config.dim // config.n_heads
-        self.attention = Attention(config)
-
-        self.layer_id = layer_id
-        self.attention_norm = RMSNorm(config.dim, eps=config.norm_eps)
-        self.ffn_norm = RMSNorm(config.dim, eps=config.norm_eps)
-        self.feed_forward = FeedForward(config) if not config.use_moe else MOEFeedForward(config)
-
-    def forward(self, x, pos_cis, past_key_value=None, use_cache=False):
-        h_attn, past_kv = self.attention(
-            self.attention_norm(x),
-            pos_cis,
-            past_key_value=past_key_value,
-            use_cache=use_cache
-        )
-        h = x + h_attn
-        out = h + self.feed_forward(self.ffn_norm(h))
-        return out, past_kv
-
-
-class MiniMindLM(PreTrainedModel):
-    config_class = LMConfig
-
-    def __init__(self, params: LMConfig = None):
-        self.params = params or LMConfig()
-        super().__init__(self.params)
-        self.vocab_size, self.n_layers = params.vocab_size, params.n_layers
-        self.tok_embeddings = nn.Embedding(params.vocab_size, params.dim)
-        self.dropout = nn.Dropout(params.dropout)
-        self.layers = nn.ModuleList([MiniMindBlock(l, params) for l in range(self.n_layers)])
-        self.norm = RMSNorm(params.dim, eps=params.norm_eps)
-        self.output = nn.Linear(params.dim, params.vocab_size, bias=False)
-        self.tok_embeddings.weight = self.output.weight
-        self.register_buffer("pos_cis",
-                             precompute_pos_cis(dim=params.dim // params.n_heads, theta=params.rope_theta),
-                             persistent=False)
-        self.OUT = CausalLMOutputWithPast()
-
-    def forward(self,
-                input_ids: Optional[torch.Tensor] = None,
-                past_key_values: Optional[List[Tuple[torch.Tensor, torch.Tensor]]] = None,
-                use_cache: bool = False,
-                logits_to_keep: Union[int, torch.Tensor] = 0,
-                **args):
-        past_key_values = past_key_values or [None] * len(self.layers)
-        start_pos = args.get('start_pos', 0)
-        h = self.dropout(self.tok_embeddings(input_ids))
-        pos_cis = self.pos_cis[start_pos:start_pos + input_ids.size(1)]
-        past_kvs = []
-        for l, layer in enumerate(self.layers):
-            h, past_kv = layer(
-                h, pos_cis,
-                past_key_value=past_key_values[l],
-                use_cache=use_cache
-            )
-            past_kvs.append(past_kv)
-
-        slice_indices = slice(-logits_to_keep, None) if isinstance(logits_to_keep, int) else logits_to_keep
-        logits = self.output(self.norm(h)[:, slice_indices, :])
-        aux_loss = sum(l.feed_forward.aux_loss for l in self.layers if isinstance(l.feed_forward, MOEFeedForward))
-        self.OUT.__setitem__('last_hidden_state', h)
-        self.OUT.__setitem__('logits', logits)
-        self.OUT.__setitem__('aux_loss', aux_loss)
-        self.OUT.__setitem__('past_key_values', past_kvs)
-        return self.OUT
-
-    @torch.inference_mode()
-    def generate(self, input_ids, eos_token_id=2, max_new_tokens=1024, temperature=0.75, top_p=0.90,
-                 stream=False, rp=1., use_cache=True, pad_token_id=0, num_return_sequences=1, **args):
-        # 流式生成
-        if stream:
-            return self._stream(input_ids, eos_token_id, max_new_tokens, temperature, top_p, rp, use_cache, **args)
-
-        # 直接生成
-        generated = []
-        for i in range(input_ids.size(0)):
-            non_pad = input_ids[i][input_ids[i] != pad_token_id].unsqueeze(0)
-            for _ in range(num_return_sequences):
-                out = self._stream(non_pad, eos_token_id, max_new_tokens, temperature, top_p, rp, use_cache, **args)
-                tokens_list = [tokens[:, -1:] for tokens in out]
-                gen = torch.cat(tokens_list, dim=-1) if tokens_list else non_pad
-                full_sequence = torch.cat([non_pad, gen], dim=-1)
-                generated.append(full_sequence)
-
-        max_length = max(seq.size(1) for seq in generated)
-        generated = [
-            torch.cat(
-                [seq, torch.full((1, max_length - seq.size(1)), pad_token_id, dtype=seq.dtype, device=seq.device)],
-                dim=-1)
-            for seq in generated
-        ]
-        output = torch.cat(generated, dim=0)
-        res = output.view(input_ids.size(0) * num_return_sequences, -1)
-        return res
-
-    def _stream(self, input_ids, eos_token_id, max_new_tokens, temperature, top_p, rp, use_cache, **args):
-        start, first_seq, past_kvs = input_ids.shape[1], True, None
-        while input_ids.shape[1] < max_new_tokens - 1:
-            if first_seq or not use_cache:
-                out, first_seq = self(input_ids, past_key_values=past_kvs, use_cache=use_cache, **args), False
-            else:
-                out = self(input_ids[:, -1:], past_key_values=past_kvs, use_cache=use_cache,
-                           start_pos=input_ids.shape[1] - 1, **args)
-            logits, past_kvs = out.logits[:, -1, :], out.past_key_values
-            logits[:, list(set(input_ids.tolist()[0]))] /= rp
-            logits /= (temperature + 1e-9)
-            if top_p is not None and top_p < 1.0:
-                sorted_logits, sorted_indices = torch.sort(logits, descending=True, dim=-1)
-                sorted_probs = F.softmax(sorted_logits, dim=-1)
-                cumulative_probs = torch.cumsum(sorted_probs, dim=-1)
-                sorted_indices_to_remove = cumulative_probs > top_p
-                sorted_indices_to_remove[:, 1:] = sorted_indices_to_remove[:, :-1].clone()
-                sorted_indices_to_remove[:, 0] = False
-                indices_to_remove = sorted_indices_to_remove.scatter(1, sorted_indices, sorted_indices_to_remove)
-                logits[indices_to_remove] = -float('Inf')
-            input_ids_next = torch.multinomial(F.softmax(logits, dim=-1), num_samples=1)
-            input_ids = torch.cat((input_ids, input_ids_next), dim=1)
-            yield input_ids[:, start:]
-            if input_ids_next.item() == eos_token_id:
-                break