commit files to HF hub

.gitattributes

@@ -33,3 +33,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 *.zip filter=lfs diff=lfs merge=lfs -text
 *.zst filter=lfs diff=lfs merge=lfs -text
 *tfevents* filter=lfs diff=lfs merge=lfs -text
+tokenizer.json filter=lfs diff=lfs merge=lfs -text

README.md

@@ -0,0 +1,214 @@
+# lmarena-ai/p2l-1.5b-bt-01132025
+
+Large language model (LLM) evaluations typically rely on aggregated metrics like accuracy or human preference, averaging across users and prompts. This averaging obscures user- and prompt-specific variations in model performance.
+To address this, we propose Prompt-to-Leaderboard (P2L), a method that produces leaderboards specific to a prompt.
+The core idea is to train an LLM taking natural language prompts as input to output a vector of coefficients which are then used to predict the human preference vote.
+The resulting prompt-dependent leaderboards allow for unsupervised task-specific evaluation, optimal routing of queries to models, personalization, and automated evaluation of model strengths and weaknesses. 
+Data from Chatbot Arena suggest that P2L better captures the nuanced landscape of language model performance than the averaged leaderboard.
+
+**Paper**: [Prompt-to-Leaderboard](https://arxiv.org/abs/2502.14855)
+
+**Code**: [lmarena/p2l](https://github.com/lmarena/p2l)
+
+This particular P2L model has a *Bradley-Terry* regression head, which we define below:
+
+$$
+\begin{equation}
+    g_{\theta(z)}(y; x) = \begin{cases}
+        \sigma(x^\top \theta^*(z)) & y = 1, \\
+        1-\sigma(x^\top \theta^*(z)) & y = 0.
+    \end{cases}
+\end{equation}
+$$
+
+More simply, given a prompt, P2L will output a vector of coefficients $\vec{\beta}$. Then the probability that model $i$ beats model $j$, $P(i \succ j) = \sigma(\vec{\beta}_i - \vec{\beta}_j)$.
+
+See section 2.2 in our paper for more details on various regression heads.
+
+## Serving
+To serve a P2L model, please see our documentation on GitHub: [Serving P2L](https://github.com/lmarena/p2l?tab=readme-ov-file#serving-p2l).
+
+Note: the P2L model outputs with this structure:
+
+
+```python
+class P2LOutputs(ModelOutput):
+    coefs: torch.FloatTensor = None # "betas" as described above
+    eta: Optional[torch.FloatTensor] = None # tie coefficent (not used for BT head)
+    last_hidden_state: torch.FloatTensor = None # last hidden state from the transformer
+```
+
+To understand which coefficient index corresponds with which model, see the [`model_list.json`](./model_list.json) found in the repo of each P2L model. As a general rule, the models will always be in sorted order.
+
+The easiest way to get this list from inside code is with the following:
+
+```python
+import json
+from huggingface_hub import hf_hub_download
+
+fname = hf_hub_download(
+        repo_id="lmarena-ai/p2l-1.5b-bt-01132025", filename="model_list.json", repo_type="model"
+    )
+
+with open(fname) as fin:
+    model_list = json.load(fin)
+```
+
+
+
+### Loading from Pretrained
+
+To define and load the model:
+
+```python
+
+import torch
+from transformers import (
+    Qwen2Model,
+    Qwen2PreTrainedModel,
+    LlamaModel,
+    LlamaPreTrainedModel,
+    PreTrainedModel,
+    AutoTokenizer,
+)
+from transformers import AutoTokenizer
+from transformers.utils import ModelOutput
+from dataclasses import dataclass
+import torch.nn as nn
+import torch.nn.functional as F
+from typing import Dict, Tuple, Callable, Optional
+from huggingface_hub import hf_hub_download
+import json
+
+
+@dataclass
+class HeadOutputs(ModelOutput):
+    coefs: torch.FloatTensor = None
+    eta: Optional[torch.FloatTensor] = None
+    gamma: Optional[torch.FloatTensor] = None
+
+
+@dataclass
+class P2LOutputs(ModelOutput):
+    coefs: torch.FloatTensor = None
+    eta: Optional[torch.FloatTensor] = None
+    gamma: Optional[torch.FloatTensor] = None
+    loss: Optional[torch.FloatTensor] = None
+    last_hidden_state: torch.FloatTensor = None
+
+class BTHead(nn.Module):
+    def __init__(
+        self, input_dim, output_dim, linear_head_downsize_factor=None, **kwargs
+    ) -> None:
+        super().__init__()
+
+        if linear_head_downsize_factor:
+            inner_dim = int(output_dim // linear_head_downsize_factor)
+            self.head = nn.Sequential(
+                nn.Linear(in_features=input_dim, out_features=inner_dim, bias=True),
+                nn.Linear(in_features=inner_dim, out_features=output_dim, bias=True),
+            )
+        else:
+            self.head = nn.Linear(
+                in_features=input_dim, out_features=output_dim, bias=True
+            )
+
+    def forward(self, last_hidden_dim: torch.Tensor):
+        coefs = self.head(last_hidden_dim)
+        return HeadOutputs(coefs=coefs)
+
+class P2LModel(Qwen2PreTrainedModel):
+    def __init__(
+        self,
+        config,
+        CLS_id,
+        num_models,
+        head_kwargs={},
+        **kwargs,
+    ):
+        super().__init__(config)
+
+        self.num_models = num_models
+        self.cls_token_id = CLS_id
+
+        self.model = Qwen2Model(config)
+
+        self.head = BTHead(
+            input_dim=config.hidden_size,
+            output_dim=self.num_models,
+            **head_kwargs,
+        )
+
+        self.post_init()
+
+    def freeze_transformer(self):
+        for param in self.model.parameters():
+            param.requires_grad = False
+
+    def get_input_embeddings(self):
+        return self.model.embed_tokens
+
+    def set_input_embeddings(self, value):
+        self.model.embed_tokens = value
+
+    def forward(self, input_ids, attention_mask, labels=None, weights=None):
+        batch_size = input_ids.shape[0]
+
+        hidden_outputs = self.model(
+            input_ids=input_ids,
+            attention_mask=attention_mask,
+            output_hidden_states=False,
+        ).last_hidden_state  # (bs, num_token, embed_dim)
+
+        cls_mask = input_ids == self.cls_token_id
+
+        # double check this is getting the current CLS token
+        cls_hidden_dim = hidden_outputs[cls_mask]
+
+        assert (
+            cls_hidden_dim.shape[0] == batch_size
+        ), f"input ids {input_ids.shape}, cls_mask {cls_mask.shape}, cls_logit {cls_hidden_dim.shape}"
+
+        head_output = self.head(cls_hidden_dim)
+
+    
+        outputs = P2LOutputs(
+            coefs=head_output.coefs,
+            last_hidden_state=cls_hidden_dim,
+            eta=head_output.eta,
+            gamma=head_output.gamma,
+        )
+
+        return outputs
+
+
+fname = hf_hub_download(
+        repo_id="lmarena-ai/p2l-1.5b-bt-01132025", filename="model_list.json", repo_type="model"
+    )
+
+with open(fname) as fin:
+    model_list = json.load(fin)
+
+tokenizer = AutoTokenizer.from_pretrained("lmarena-ai/p2l-1.5b-bt-01132025")
+model = P2LModel.from_pretrained(
+    "lmarena-ai/p2l-1.5b-bt-01132025",
+    CLS_id=tokenizer.cls_token_id,
+    num_models=len(model_list),
+    torch_dtype=torch.bfloat16,
+)
+
+```
+
+## Citation
+
+```
+@misc{frick2025prompttoleaderboard,
+      title={Prompt-to-Leaderboard}, 
+      author={Evan Frick and Connor Chen and Joseph Tennyson and Tianle Li and Wei-Lin Chiang and Anastasios N. Angelopoulos and Ion Stoica},
+      year={2025},
+      eprint={2502.14855},
+      archivePrefix={arXiv},
+      primaryClass={cs.LG},
+      url={https://arxiv.org/abs/2502.14855}, 
+}
+```

added_tokens.json

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config.json

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+  "use_cache": true,
+  "use_sliding_window": false,
+  "vocab_size": 151936
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+ "athene-70b-0725",
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+ "deepseek-coder-v2",
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+  ],
+  "bos_token": null,
+  "chat_template": "{%- if messages[0]['role'] == 'system' %}\n    {{- '<|im_start|>system\\n' + messages[0]['content'] + '<|im_end|>\\n' }}\n{%- endif %}\n{%- for message in messages %}\n    {%- if (message.role == \"user\") or (message.role == \"system\" and not loop.first) or (message.role == \"assistant\" and not message.tool_calls) %}\n        {{- '<|im_start|>' + message.role + '\\n' + message.content + '<|im_end|>' + '\\n' }}\n    {%- elif message.role == \"assistant\" %}\n        {{- '<|im_start|>' + message.role }}\n        {%- if message.content %}\n            {{- '\\n' + message.content }}\n        {%- endif %}\n        {%- for tool_call in message.tool_calls %}\n            {%- if tool_call.function is defined %}\n                {%- set tool_call = tool_call.function %}\n            {%- endif %}\n            {{- '\\n<tool_call>\\n{\"name\": \"' }}\n            {{- tool_call.name }}\n            {{- '\", \"arguments\": ' }}\n            {{- tool_call.arguments | tojson }}\n            {{- '}\\n</tool_call>' }}\n        {%- endfor %}\n        {{- '<|im_end|>\\n' }}\n    {%- elif message.role == \"tool\" %}\n        {%- if (loop.index0 == 0) or (messages[loop.index0 - 1].role != \"tool\") %}\n            {{- '<|im_start|>user' }}\n        {%- endif %}\n        {{- '\\n<tool_response>\\n' }}\n        {{- message.content }}\n        {{- '\\n</tool_response>' }}\n        {%- if loop.last or (messages[loop.index0 + 1].role != \"tool\") %}\n            {{- '<|im_end|>\\n' }}\n        {%- endif %}\n    {%- endif %}\n{%- endfor %}\n{%- if add_generation_prompt %}\n    {{- '<|im_start|>assistant\\n' }}\n{%- endif %}\n\n",
+  "clean_up_tokenization_spaces": false,
+  "cls_token": "<|cls|>",
+  "eos_token": "<|im_end|>",
+  "errors": "replace",
+  "extra_special_tokens": {},
+  "model_max_length": 131072,
+  "pad_token": "<|endoftext|>",
+  "split_special_tokens": false,
+  "tokenizer_class": "Qwen2Tokenizer",
+  "unk_token": null
+}

training_args.bin

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:96f57ae539547f7c5e66690f3359967ffc904b3e7ef705495ef1e9364a6c7505
+size 7032

training_config.json

@@ -0,0 +1,21 @@
+{
+ "proj_name": "Qwen2.5-1.5B-Instruct-full-train",
+ "learning_rate": 4e-06,
+ "adam_epsilon": 1e-08,
+ "batch_size": 4,
+ "max_length": 8192,
+ "num_train_epochs": 1,
+ "train_data_path": "full-p2l-data",
+ "val_data_path": "p2el/canonical_bt_val_data_11092024",
+ "output_dir": "training_outputs",
+ "pretrain_model_name": "Qwen/Qwen2.5-1.5B-Instruct",
+ "gradient_accumulation_steps": 16,
+ "chat_template": "{%- if messages[0]['role'] == 'system' %}\n    {{- '<|im_start|>system\\n' + messages[0]['content'] + '<|im_end|>\\n' }}\n{%- endif %}\n{%- for message in messages %}\n    {%- if (message.role == \"user\") or (message.role == \"system\" and not loop.first) or (message.role == \"assistant\" and not message.tool_calls) %}\n        {{- '<|im_start|>' + message.role + '\\n' + message.content + '<|im_end|>' + '\\n' }}\n    {%- elif message.role == \"assistant\" %}\n        {{- '<|im_start|>' + message.role }}\n        {%- if message.content %}\n            {{- '\\n' + message.content }}\n        {%- endif %}\n        {%- for tool_call in message.tool_calls %}\n            {%- if tool_call.function is defined %}\n                {%- set tool_call = tool_call.function %}\n            {%- endif %}\n            {{- '\\n<tool_call>\\n{\"name\": \"' }}\n            {{- tool_call.name }}\n            {{- '\", \"arguments\": ' }}\n            {{- tool_call.arguments | tojson }}\n            {{- '}\\n</tool_call>' }}\n        {%- endfor %}\n        {{- '<|im_end|>\\n' }}\n    {%- elif message.role == \"tool\" %}\n        {%- if (loop.index0 == 0) or (messages[loop.index0 - 1].role != \"tool\") %}\n            {{- '<|im_start|>user' }}\n        {%- endif %}\n        {{- '\\n<tool_response>\\n' }}\n        {{- message.content }}\n        {{- '\\n</tool_response>' }}\n        {%- if loop.last or (messages[loop.index0 + 1].role != \"tool\") %}\n            {{- '<|im_end|>\\n' }}\n        {%- endif %}\n    {%- endif %}\n{%- endfor %}\n{%- if add_generation_prompt %}\n    {{- '<|im_start|>assistant\\n' }}\n{%- endif %}\n\n",
+ "model_type": "qwen2",
+ "head_type": "bt",
+ "loss_type": "bt_tie",
+ "weighted_loss": false,
+ "deepspeed_config_path": "deepspeed/zero1.json",
+ "init_type": "reset_params",
+ "load_train_data_from_disk": true
+}