Update README.md

README.md

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----
-license: apache-2.0
----
+---
+license: apache-2.0
+language:
+- en
+tags:
+- Retrieval
+- LLM
+- Embedding
+---
+
+This model is trained through the approach described in [DMRetriever: A Family of Models for Improved Text Retrieval in Disaster Management](https://www.arxiv.org/abs/2510.15087). 
+The associated GitHub repository is available [here](https://github.com/KaiYin97/DMRETRIEVER).
+This model has 7.6M parameters.
+
+## 🧠 Model Overview
+
+**DMRetriever-596M** has the following features:
+
+- Model Type: Text Embedding
+- Supported Languages: English
+- Number of Paramaters: 7.6B
+- Embedding Dimension: 4096
+
+For more details, including model training, benchmark evaluation, and inference performance, please refer to our [paper](https://www.arxiv.org/abs/2510.15087), [GitHub](https://github.com/KaiYin97/DMRETRIEVER).
+
+## 📦 DMRetriever Series Model List
+
+| **Model** | **Description** | **Backbone** | **Backbone Type** | **Hidden Size** | **#Layers** |
+|:--|:--|:--|:--|:--:|:--:|
+| [DMRetriever-33M](https://huggingface.co/DMIR01/DMRetriever-33M) | Base 33M variant | MiniLM | Encoder-only | 384 | 12 |
+| [DMRetriever-33M-PT](https://huggingface.co/DMIR01/DMRetriever-33M-PT) | Pre-trained version of 33M | MiniLM | Encoder-only | 384 | 12 |
+| [DMRetriever-109M](https://huggingface.co/DMIR01/DMRetriever-109M) | Base 109M variant | BERT-base-uncased | Encoder-only | 768 | 12 |
+| [DMRetriever-109M-PT](https://huggingface.co/DMIR01/DMRetriever-109M-PT) | Pre-trained version of 109M | BERT-base-uncased | Encoder-only | 768 | 12 |
+| [DMRetriever-335M](https://huggingface.co/DMIR01/DMRetriever-335M) | Base 335M variant | BERT-large-uncased-WWM | Encoder-only | 1024 | 24 |
+| [DMRetriever-335M-PT](https://huggingface.co/DMIR01/DMRetriever-335M-PT) | Pre-trained version of 335M | BERT-large-uncased-WWM | Encoder-only | 1024 | 24 |
+| [DMRetriever-596M](https://huggingface.co/DMIR01/DMRetriever-596M) | Base 596M variant | Qwen3-0.6B | Decoder-only | 1024 | 28 |
+| [DMRetriever-596M-PT](https://huggingface.co/DMIR01/DMRetriever-596M-PT) | Pre-trained version of 596M | Qwen3-0.6B | Decoder-only | 1024 | 28 |
+| [DMRetriever-4B](https://huggingface.co/DMIR01/DMRetriever-4B) | Base 4B variant | Qwen3-4B | Decoder-only | 2560 | 36 |
+| [DMRetriever-4B-PT](https://huggingface.co/DMIR01/DMRetriever-4B-PT) | Pre-trained version of 4B | Qwen3-4B | Decoder-only | 2560 | 36 |
+| [DMRetriever-7.6B](https://huggingface.co/DMIR01/DMRetriever-7.6B) | Base 7.6B variant | Qwen3-8B | Decoder-only | 4096 | 36 |
+| [DMRetriever-7.6B-PT](https://huggingface.co/DMIR01/DMRetriever-7.6B-PT) | Pre-trained version of 7.6B | Qwen3-8B | Decoder-only | 4096 | 36 |
+
+
+## 🚀 Usage
+
+Using HuggingFace Transformers:
+
+```python
+# pip install torch transformers
+import torch
+import torch.nn.functional as F
+from transformers import AutoTokenizer
+from bidirectional_qwen3 import Qwen3BiModel  # custom bidirectional backbone
+
+MODEL_ID = "DMIR01/DMRetriever-7.6B"
+
+# Device & dtype
+device = "cuda" if torch.cuda.is_available() else "cpu"
+dtype = torch.float16 if device == "cuda" else torch.float32
+
+# --- Tokenizer (needs remote code for custom modules) ---
+tokenizer = AutoTokenizer.from_pretrained(
+    MODEL_ID,
+    trust_remote_code=True,
+    use_fast=False,
+)
+# Ensure pad token and right padding (matches training)
+if getattr(tokenizer, "pad_token_id", None) is None and getattr(tokenizer, "eos_token", None) is not None:
+    tokenizer.pad_token = tokenizer.eos_token
+tokenizer.padding_side = "right"
+
+# --- Bidirectional encoder (non-autoregressive; for retrieval/embedding) ---
+model = Qwen3BiModel.from_pretrained(
+    MODEL_ID,
+    torch_dtype=dtype,
+    trust_remote_code=True,
+).to(device).eval()
+
+# --- Mean pooling over valid tokens ---
+def mean_pool(last_hidden_state: torch.Tensor, attention_mask: torch.Tensor) -> torch.Tensor:
+    mask = attention_mask.unsqueeze(-1).to(last_hidden_state.dtype)  # [B, L, 1]
+    summed = (last_hidden_state * mask).sum(dim=1)                   # [B, H]
+    counts = mask.sum(dim=1).clamp(min=1e-9)                         # [B, 1]
+    return summed / counts
+
+# --- Batch encoder: returns L2-normalized embeddings ---
+def encode_texts(texts, batch_size=32, max_length=512):
+    vecs = []
+    for i in range(0, len(texts), batch_size):
+        batch = texts[i:i+batch_size]
+        with torch.no_grad():
+            inputs = tokenizer(
+                batch,
+                max_length=max_length,
+                truncation=True,
+                padding=True,
+                return_tensors="pt",
+            ).to(device)
+            hidden = model(**inputs).last_hidden_state
+            emb = mean_pool(hidden, inputs["attention_mask"])
+            emb = F.normalize(emb, p=2, dim=1)  # cosine-ready
+            vecs.append(emb.cpu())
+    return torch.cat(vecs, dim=0) if vecs else torch.empty(0, model.config.hidden_size)
+
+# --- Task instructions (apply to queries only) ---
+TASK2PREFIX = {
+    "FactCheck": "Given the claim, retrieve most relevant document that supports or refutes the claim",
+    "NLI":       "Given the premise, retrieve most relevant hypothesis that is entailed by the premise",
+    "QA":        "Given the question, retrieve most relevant passage that best answers the question",
+    "QAdoc":     "Given the question, retrieve the most relevant document that answers the question",
+    "STS":       "Given the sentence, retrieve the sentence with the same meaning",
+    "Twitter":   "Given the user query, retrieve the most relevant Twitter text that meets the request",
+}
+
+def apply_task_prefix(queries, task: str):
+    """Add instruction to queries; corpus texts remain unchanged."""
+    prefix = TASK2PREFIX.get(task, "")
+    if prefix:
+        return [f"{prefix}: {q.strip()}" for q in queries]
+    return [q.strip() for q in queries]
+
+# ========================= Usage =========================
+# Queries need task instruction
+task = "QA"
+queries_raw = [
+    "Who wrote The Little Prince?",
+    "What is the capital of France?",
+]
+queries = apply_task_prefix(queries_raw, task)
+
+# Corpus: no instruction
+corpus_passages = [
+    "The Little Prince is a novella by Antoine de Saint-Exupéry, first published in 1943.",
+    "Paris is the capital and most populous city of France.",
+    "Transformers are neural architectures that rely on attention mechanisms.",
+]
+
+# Encode
+query_emb  = encode_texts(queries,         batch_size=32, max_length=512)  # [Q, H]
+corpus_emb = encode_texts(corpus_passages, batch_size=32, max_length=512)  # [D, H]
+print("Query embeddings:",  tuple(query_emb.shape))
+print("Corpus embeddings:", tuple(corpus_emb.shape))
+
+# Retrieval demo: cosine similarity via dot product (embeddings are normalized)
+scores = query_emb @ corpus_emb.T  # [Q, D]
+topk = scores.topk(k=min(3, corpus_emb.size(0)), dim=1)
+
+for i, q in enumerate(queries_raw):
+    print(f"\nQuery[{i}] {q}")
+    for rank, (score, idx) in enumerate(zip(topk.values[i].tolist(), topk.indices[i].tolist()), start=1):
+        print(f"  Top{rank}: doc#{idx} | score={score:.4f} | text={corpus_passages[idx]}")
+
+
+```
+
+## ⚠️ Notice
+
+1. The **backbone** used in DMRetriever is **Bidirectional Qwen3**, not the standard Qwen3.  
+   Please ensure that the `bidirectional_qwen3` module (included in the released model checkpoint folder) is correctly placed inside your model directory.
+
+2. Make sure that your **transformers** library version is **> 4.51.0** to avoid the error:  
+   `KeyError: 'qwen3'`.
+
+
+## 🧾 Citation
+If you find this repository helpful, please kindly consider citing the corresponding paper. Thanks!
+```
+@article{yin2025dmretriever,
+  title={DMRetriever: A Family of Models for Improved Text Retrieval in Disaster Management},
+  author={Yin, Kai and Dong, Xiangjue and Liu, Chengkai and Lin, Allen and Shi, Lingfeng and Mostafavi, Ali and Caverlee, James},
+  journal={arXiv preprint arXiv:2510.15087},
+  year={2025}
+}
+```
+
+