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README.md

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+# DenseBackwardOLMoE
+
+自定义的OLMoE模型，使用DenseBackwardOlmoeSparseMoeBlock替换原版的MoE模块，实现dense backward功能。
+
+## 用法
+
+```python
+from transformers import AutoConfig, AutoModelForCausalLM
+
+# 使用trust_remote_code=True加载模型
+config = AutoConfig.from_pretrained("autoprogrammer/olmoe_densebackward", trust_remote_code=True)
+model = AutoModelForCausalLM.from_pretrained("autoprogrammer/olmoe_densebackward", config=config, trust_remote_code=True)
+```

__init__.py

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+# 导出自定义配置和模型类
+from .configuration_custom import DenseBackwardOLMoEConfig
+from .modeling_custom import DenseBackwardOLMoEForCausalLM, DenseBackwardOlmoeSparseMoeBlock
+
+__all__ = [
+    "DenseBackwardOLMoEConfig",
+    "DenseBackwardOLMoEForCausalLM", 
+    "DenseBackwardOlmoeSparseMoeBlock"
+]

config.json

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+{
+  "_name_or_path": "allenai/OLMoE-1B-7B-0125",
+  "architectures": [
+    "DenseBackwardOLMoEForCausalLM"
+  ],
+  "attention_bias": false,
+  "attention_dropout": 0.0,
+  "clip_qkv": null,
+  "eos_token_id": 50279,
+  "hidden_act": "silu",
+  "hidden_size": 2048,
+  "initializer_range": 0.02,
+  "intermediate_size": 1024,
+  "max_position_embeddings": 4096,
+  "model_type": "olmoe",
+  "norm_topk_prob": false,
+  "num_attention_heads": 16,
+  "num_experts": 64,
+  "num_experts_per_tok": 8,
+  "num_hidden_layers": 16,
+  "num_key_value_heads": 16,
+  "output_router_logits": false,
+  "pad_token_id": 1,
+  "rms_norm_eps": 1e-05,
+  "rope_scaling": null,
+  "rope_theta": 10000.0,
+  "router_aux_loss_coef": 0.01,
+  "tie_word_embeddings": false,
+  "torch_dtype": "float32",
+  "transformers_version": "4.45.2",
+  "use_cache": true,
+  "vocab_size": 50304
+}

configuration_custom.py

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+# my_custom_olmoe/configuration_custom.py
+
+# 注意：根据你的 transformers 版本，导入官方 OLMoE 配置的路径可能需要调整
+from transformers.models.olmoe.configuration_olmoe import OlmoeConfig
+
+class DenseBackwardOLMoEConfig(OlmoeConfig):
+    model_type = "DenseBackward_olmoe"  # 这里覆盖 model_type 字段，便于后续识别
+    
+    # 添加auto_map用于支持AutoClass
+    auto_map = {
+        "AutoConfig": "configuration_custom.DenseBackwardOLMoEConfig",
+        "AutoModelForCausalLM": "modeling_custom.DenseBackwardOLMoEForCausalLM"
+    }
+
+    def __init__(self, model_marker="DenseBackward_olmoe_marker", **kwargs):
+        super().__init__(**kwargs)
+        self.model_marker = model_marker
+        self.intermediate_size= 1024
+#test
+def main():
+    config = DenseBackwardOLMoEConfig(model_marker="DenseBackward_olmoe_marker")
+    print(config)
+
+if __name__ == "__main__":
+    main()

generation_config.json

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+{
+  "_from_model_config": true,
+  "eos_token_id": 50279,
+  "pad_token_id": 1,
+  "transformers_version": "4.45.2"
+}

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modeling_custom.py

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+# my_custom_olmoe/modeling_custom.py
+
+import torch
+import torch.nn as nn
+import torch.nn.functional as F
+
+# 导入官方实现（注意根据你的 transformers 版本调整导入路径）
+from transformers.models.olmoe.modeling_olmoe import OlmoeForCausalLM, OlmoeSparseMoeBlock, OlmoeMLP
+from configuration_custom import DenseBackwardOLMoEConfig
+
+
+class DenseBackwardOlmoeSparseMoeBlock(OlmoeSparseMoeBlock):
+    """
+    继承自官方 OlmoeSparseMoeBlock，实现 dense backward 功能：
+    前向输出依旧保持与官方相同（即稀疏计算结果），
+    但在反向传播时，通过直通梯度让 dense 计算的梯度传递回来，
+    dense 输出通过对每个专家在所有 token 上进行计算，并利用全 routing 权重加权获得。
+    
+    输入：
+        hidden_states: Tensor, shape (batch_size, sequence_length, hidden_dim)
+    输出：
+        final_output: Tensor, shape (batch_size, sequence_length, hidden_dim)
+        router_logits: Tensor, shape (batch_size * sequence_length, num_experts)
+    """
+    def forward(self, hidden_states: torch.Tensor):
+        """
+        输入:
+        hidden_states: Tensor, shape (batch_size, sequence_length, hidden_dim)
+        输出:
+            final_output: Tensor, shape (batch_size, sequence_length, hidden_dim)
+            router_logits: Tensor, shape (batch_size * sequence_length, num_experts)
+        实现思路：
+          1. 将输入展平为 (B*seq_len, hidden_dim)，通过 self.gate 得到 router_logits，
+             并计算全专家的 routing 权重（softmax 后）。
+          2. 对 routing 权重取 top-k，得到 routing_weights_topk 与 selected_experts；
+             如配置要求，归一化 top-k 概率。
+          3. 稀疏计算部分：仅计算每个 token 对于 top-k 专家的输出，
+             并累加得到 sparse_output（保留原版计算流程，同时记录激活专家的实际输出）。
+          4. Dense 估计部分：先计算所有专家对所有 token 的输出（all_expert_outputs），
+             再逐 token 调用 estimate_dense_output 得到 dense 输出（dense_estimated）。
+          5. 使用直通梯度技巧：前向输出用 sparse_output，但梯度来源于 dense_estimated。
+          6. 最后 reshape 为 (batch_size, sequence_length, hidden_dim) 并返回 final_output 及 router_logits.
+        """
+        #determine the shape of hidden_states
+        batch_size, seq_length, hidden_dim = hidden_states.shape
+        flat_hidden = hidden_states.view(-1, hidden_dim)  # (B*seq_len, hidden_dim)
+
+        # 计算路由 logits 和全专家 routing 权重
+        router_logits = self.gate(flat_hidden)  # (B*seq_len, num_experts)
+        routing_weights = F.softmax(router_logits, dim=1, dtype=torch.float)  # (B*seq_len, num_experts)
+
+        # Top-k 选择
+        routing_weights_topk, selected_experts = torch.topk(routing_weights, self.top_k, dim=-1)
+        if self.norm_topk_prob:
+            routing_weights_topk = routing_weights_topk / routing_weights_topk.sum(dim=-1, keepdim=True)
+        routing_weights_topk = routing_weights_topk.to(flat_hidden.dtype)
+
+        # ---------- 稀疏计算部分 ----------
+        # 初始化稀疏输出，shape: (B*seq_len, hidden_dim)
+        sparse_output = torch.zeros((flat_hidden.size(0), hidden_dim), dtype=flat_hidden.dtype, device=flat_hidden.device)
+        # 用于记录每个 token 对激活专家的实际输出
+        activated_outputs = [{} for _ in range(flat_hidden.size(0))]
+        # one-hot 编码 top-k 专家，shape: (B*seq_len, top_k, num_experts)
+        expert_mask = F.one_hot(selected_experts, num_classes=self.num_experts)  # (B*seq_len, top_k, num_experts)
+        expert_mask = expert_mask.permute(2, 1, 0)  # (num_experts, top_k, B*seq_len)
+
+        for expert_idx in range(self.num_experts):
+            expert_layer = self.experts[expert_idx]
+            idx, top_x = torch.where(expert_mask[expert_idx])
+            if top_x.numel() > 0:
+                current_state = flat_hidden[top_x]  # (n, hidden_dim)
+                current_output = expert_layer(current_state)  # (n, hidden_dim)
+                weight = routing_weights_topk[top_x, idx].unsqueeze(-1)  # (n, 1)
+                weighted_output = current_output * weight
+                sparse_output.index_add_(0, top_x, weighted_output.to(flat_hidden.dtype))
+                # 保存当前 token 对该专家的实际输出
+                for pos, token_idx in enumerate(top_x.tolist()):
+                    activated_outputs[token_idx][expert_idx] = current_output[pos]
+        # ---------- 稀疏计算结束 ----------
+
+        # ---------- Dense估计部分 ----------
+        # 计算所有专家对所有 token 的 dense 输出，shape: (B*seq_len, num_experts, hidden_dim)
+        all_expert_outputs = torch.stack([expert(flat_hidden) for expert in self.experts], dim=1)
+        # 将 selected_experts 转换为 list，每个 token 的激活专家列表
+        all_routing = selected_experts.tolist()  # 长度为 (B*seq_len)
+        
+        dense_outputs = []
+        for i in range(flat_hidden.size(0)):
+            dense_est = self.estimate_dense_output(
+                token_idx=i,
+                activated=all_routing[i],              # 当前 token 激活的专家列表，例如 [a, b]
+                gate_prob=routing_weights[i],            # 当前 token 的完整 routing 权重 (num_experts,)
+                activated_outputs=activated_outputs[i],  # 当前 token 对激活专家的实际输出
+                all_routing=all_routing,                 # 全 batch 每个 token 的激活专家列表（list of lists）
+                all_expert_outputs=all_expert_outputs      # (B*seq_len, num_experts, hidden_dim)
+            )
+            dense_outputs.append(dense_est.unsqueeze(0))
+        dense_outputs = torch.cat(dense_outputs, dim=0)  # (B*seq_len, hidden_dim)
+        # ---------- Dense估计结束 ----------
+
+        # 使用直通梯度：前向输出用稀疏结果，但反向传播时梯度来源于 dense 估计
+        final_flat = sparse_output.detach() + (dense_outputs - dense_outputs.detach())
+        final_output = final_flat.view(batch_size, seq_length, hidden_dim)
+        return final_output, router_logits
+
+    def estimate_dense_output(self, token_idx, activated, gate_prob, activated_outputs, all_routing, all_expert_outputs):
+        """
+        对于当前 token，根据 mini-batch 中的信息估计 dense 输出。
+        参数：
+            token_idx: 当前 token 的索引（标量）
+            activated: 当前 token 激活的专家列表，例如 [1, 3]
+            gate_prob: 当前 token 的 routing 权重，形状 (num_experts,)
+            activated_outputs: dict，当前 token 对激活专家的实际输出，形状 (hidden_dim,)
+            all_routing: list，每个 token 的激活专家列表（长度为 N，每个元素为 list）
+            all_expert_outputs: Tensor, (N, num_experts, hidden_dim)
+        返回：
+            estimated_dense: Tensor, (hidden_dim,)
+        """
+        num_experts = gate_prob.size(0)
+        dense_parts = {}
+        # 对于激活的专家，直接使用其实际输出
+        for idx in activated:
+            dense_parts[idx] = activated_outputs[idx]
+        # 对于未激活的专家，使用 mini-batch 中其他 token 的输出估计
+        non_activated = [i for i in range(num_experts) if i not in activated]
+        for i in non_activated:
+            indices = []
+            for idx, r_dec in enumerate(all_routing):
+                if (i in r_dec) and (len(set(r_dec) & set(activated)) > 0):
+                    indices.append(idx)
+            if indices:
+                selected_outputs = all_expert_outputs[indices, i, :]  # (n, hidden_dim)
+                estimated = selected_outputs.mean(dim=0)
+            else:
+                estimated = all_expert_outputs[:, i, :].mean(dim=0)
+            dense_parts[i] = estimated
+        # 按 gate_prob 加权求和各专家输出
+        estimated_dense = 0
+        for i in range(num_experts):
+            estimated_dense += gate_prob[i] * dense_parts[i]
+        return estimated_dense
+
+
+class DenseBackwardOLMoEForCausalLM(OlmoeForCausalLM):
+    """
+    自定义的 Olmoe ForCausalLM 模型，使用新的 DenseBackwardOlmoeSparseMoeBlock 替换原版的 MoE 模块，
+    以实现 dense backward 功能。
+    
+    配置类：DenseBackwardOLMoEConfig
+    """
+    config_class = DenseBackwardOLMoEConfig
+    base_model_prefix = "olmoe"
+
+    def __init__(self, config):
+        # 首先调用父类初始化方法
+        super().__init__(config)
+        
+        # 不要尝试重新赋值self，而是从预训练模型加载并更新当前模型
+        pretrained_model = OlmoeForCausalLM.from_pretrained("allenai/OLMoE-1B-7B-0125")
+        
+        # 复制预训练模型的状态到当前模型
+        self.config = pretrained_model.config
+        self.model = pretrained_model.model
+        self.vocab_size = pretrained_model.vocab_size
+        self.router_aux_loss_coef = pretrained_model.router_aux_loss_coef
+        self.num_experts = pretrained_model.num_experts
+        self.lm_head = pretrained_model.lm_head
+        
+        # 遍历模型中所有 decoder 层，替换每个 OlmoeSparseMoeBlock 为 DenseBackward 版本
+        # 此处假设官方模型在 self.model.layers 中组织 decoder 层，
+        # 且每层中 mlp 模块包含属性 sparse_moe_block。
+        for layer in self.model.layers:
+            if hasattr(layer.mlp, "gate"):
+                print("111")
+                orig_block = layer.mlp
+                # 通过直接复制原版属性创建新的块
+                new_block = DenseBackwardOlmoeSparseMoeBlock(config)  # 或其他适当参数
+                # 然后手动复制需要共享的属性：
+                new_block.gate = orig_block.gate
+                new_block.experts = orig_block.experts
+                new_block.num_experts = orig_block.num_experts
+                new_block.top_k = orig_block.top_k
+                new_block.norm_topk_prob = orig_block.norm_topk_prob
+                layer.mlp = new_block
+                print(type(layer.mlp))
+        # 在调用post_init()前
+        test_param = self.model.layers[0].mlp.experts[0].up_proj.weight.data[0, 0].item()
+        print(f"权重示例值（前）: {test_param}")
+        self.post_init()
+        # 在调用post_init()后
+        test_param_after = self.model.layers[0].mlp.experts[0].up_proj.weight.data[0, 0].item()
+        print(f"权重示例值（后）: {test_param_after}")
+
+def main():
+    config = DenseBackwardOLMoEConfig(        # 官方模型参数
+    model_marker="DenseBackward_olmoe_marker",
+)
+# 创建自定义模型实例
+    model = DenseBackwardOLMoEForCausalLM(config)
+    print(type(model))
+    print(type(model.model))
+    print(type(model.model.layers[0]))
+    print(type(model.model.layers[0].mlp))
+    print(type(model.model.layers[0].mlp.experts))
+if __name__ == "__main__":
+    main()

special_tokens_map.json

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+{
+  "eos_token": {
+    "content": "<|endoftext|>",
+    "lstrip": false,
+    "normalized": false,
+    "rstrip": false,
+    "single_word": false
+  },
+  "pad_token": {
+    "content": "<|padding|>",
+    "lstrip": false,
+    "normalized": false,
+    "rstrip": false,
+    "single_word": false
+  }
+}

tokenizer_config.json

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+{
+  "add_bos_token": false,
+  "add_eos_token": false,
+  "add_prefix_space": false,
+  "added_tokens_decoder": {
+    "0": {
+      "content": "|||IP_ADDRESS|||",
+      "lstrip": false,
+      "normalized": true,
+      "rstrip": false,
+      "single_word": false,
+      "special": false
+    },
+    "1": {
+      "content": "<|padding|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
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+      "normalized": true,
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+      "single_word": false,
+      "special": false
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+      "lstrip": false,
+      "normalized": true,
+      "rstrip": false,
+      "single_word": false,
+      "special": false
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