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Model: OrionLLM/Nebula
Source: Original Platform

.gitattributes

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README.md

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+---
+license: apache-2.0
+pipeline_tag: text-generation
+library_name: transformers
+tags:
+- nebula
+- reasoning
+- text-generation
+- transformers
+---
+
+# Nebula
+
+<p align="center">
+  <img src="https://cdn-uploads.huggingface.co/production/uploads/685ea8ff7b4139b6845ce395/YF0kEDYMGJhcM3Lbl2EOD.png" alt="Nebula logo" width="100">
+</p>
+
+## 1. Introduction
+**Nebula** is a **320M-parameter** generalist Small Reasoning Model trained on **200B+ tokens**, designed for edge AI and on-device deployment.
+
+Nebula is designed to deliver an unusually strong balance of **memory**, **general reasoning**, **math**, and **retrieval-friendly behavior** for its size class, aiming to outperform many small models of a similar parameter range on non-code, industry-style benchmarks.
+
+## 2. Reasoning style
+Nebula’s reasoning traces use an intentionally compact style with **dense, short, frequently non-verbal sentences**, optimized for efficiency under limited model capacity.
+
+Traces use the following stenographic notation integrated into special tokens:
+
+### Logical markers
+
+| Token | Meaning | Usage |
+| ----- | ------- | ----- |
+| **→** | derivation / implication | For very short causal/logical flow |
+| **↺** | iterative return / refinement loop | For backtracking, reconsidering priors, RAG re-querying |
+| **?** | uncertainty/questions to resolve | Can be appended to short expressions/words, not only interrogatives |
+| **!/※** | insight/breakthroughs | Emphatic mark for knowledge discovery |
+| **≈** | approximation/estimates | For intermediary hypothesis / uncertain preliminary statements |
+| **∴** | therefore / final step | Use sparingly to mark stable conclusions |
+
+### Uncertainty
+
+| Token | Meaning | Usage |
+| ----- | ------- | ----- |
+| **●** | high confidence | well-supported empirical/theoretical ground; “anchor points.” |
+| **◐** | medium/partial confidence | incomplete data; plausible but unverified links |
+| **○** | low confidence | speculation, missing context, weak inference chain |
+| **⚠** | bias/premise risk | domain mismatch, cultural assumptions, language-switch artifacts |
+| **?maybe?** | soft speculation | marks tentative ideas, branches that might collapse later |
+
+### Verification process
+
+| Token | Meaning | Usage |
+| ----- | ------- | ----- |
+| **☐** | unverified hypothesis | raw claim, no cross-check yet |
+| **☑** | intermediate verification | one source/argument supports it |
+| **✓** | confirmed/validated | multiple independent supports (●-level) |
+
+This reasoning format is designed to remain expressive while being lightweight enough for a small model.
+
+## 3. Fine-Tuning/RL
+Nebula has been successfully fine-tuned for a variety of tasks
+
+Because Nebula is a reasoning-oriented model, it is expected to train well with reinforcement learning methods such as **GRPO**, both for **verifiable tasks** (with objective rewards) and for subjective tasks using an **LLM-as-a-judge**.
+
+## 4. Benchmarks
+
+| Model | MMLU |
+|------|-----:|
+| **Nebula** | **40.0** |
+| SmolLM2-360M | 35.8 |
+| Gemma 3 270M (IT) | 26.5 |
+| Granite-4.0-H-350M | 36.21 |

chat_template.json

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+{
+  "chat_template": "{% for m in messages %}<|im_start|>{{ m['role'] }}\n{{ m['content'] }}<|im_end|>\n{% endfor %}{% if add_generation_prompt %}<|im_start|>assistant\n<think>\n{% endif %}",
+  "eos_token": "<|im_end|>",
+  "bos_token": "<|im_start|>",
+  "stop": ["<|im_end|>"],
+  "roles": { "user": "user", "assistant": "assistant", "system": "system" }
+}

config.json

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+{
+  "architectures": [
+    "LlamaForCausalLM"
+  ],
+  "attention_bias": false,
+  "attention_dropout": 0.0,
+  "bos_token_id": 1,
+  "eos_token_id": 2,
+  "head_dim": 64,
+  "hidden_act": "silu",
+  "hidden_size": 576,
+  "initializer_range": 0.02,
+  "intermediate_size": 1536,
+  "max_position_embeddings": 4096,
+  "mlp_bias": false,
+  "model_type": "llama",
+  "num_attention_heads": 9,
+  "num_hidden_layers": 80,
+  "num_key_value_heads": 3,
+  "pretraining_tp": 1,
+  "rms_norm_eps": 1e-05,
+  "rope_scaling": null,
+  "rope_theta": 10000,
+  "tie_word_embeddings": true,
+  "torch_dtype": "bfloat16",
+  "transformers_version": "4.51.3",
+  "use_cache": true,
+  "vocab_size": 65536
+}

generation_config.json

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+{
+  "_from_model_config": true,
+  "bos_token_id": 1,
+  "eos_token_id": 2,
+  "transformers_version": "4.51.3"
+}

model.safetensors

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special_tokens_map.json

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+    "<|im_end>",
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+  "eos_token": "<|end_of_text|>",
+  "pad_token": "[PAD]",
+  "unk_token": "[UNK]"
+}

tokenizer_config.json

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