Text Generation
Transformers
Safetensors
Ukrainian
qwen2
legal
ukrainian
continued-pretraining
court-decisions
text-generation-inference

Qwen2.5-14B-EDRSR-Legal-UK

Ukrainian legal domain model obtained by continued pretraining (CPT) of Qwen/Qwen2.5-14B on the EDRSR corpus of Ukrainian court decisions.

Part of a scaling experiment (0.5B / 1.5B / 3B / 14B) for the PhD dissertation at Glushkov Institute of Cybernetics, NAS of Ukraine.

Training Data

  • Corpus: Unified State Register of Court Decisions of Ukraine (EDRSR)
  • Documents: 33.9M court decisions (after dedup + quality filtering from 38.5M)
  • Tokens: 161.4B tokens (Qwen2 BPE tokenizer, fertility = 0.515 for Ukrainian legal text)
  • Sequence length: 8,192 tokens
  • Shards: 1,233 pre-packaged numpy shards

Training Details

  • Hardware: 8x NVIDIA H100 SXM 80GB (NVIDIA Innovation Lab via Brev)
  • Framework: HuggingFace Trainer + DeepSpeed ZeRO-3
  • Precision: bfloat16
  • Global batch size: 128 sequences (1.05M tokens/step)
  • Total steps: 9,536 (10B tokens processed)
  • Training time: 44 hours
  • Throughput: 22K tokens/sec, 44.9 sec/step

Results

Metric Value
Initial loss (step 10) 0.84
Final loss (step 9,536) 0.22
Loss reduction -74%
Base perplexity 2.84
CPT perplexity 1.28
Perplexity reduction -54.8%

Scaling Law

All four models in the series converge to similar perplexity after CPT:

Model Base PPL CPT PPL Reduction
0.5B 6.83 1.35 -80%
1.5B 4.61 1.31 -72%
3B 3.83 1.30 -66%
14B 2.84 1.28 -55%

Intended Use

This is a base model (not instruction-tuned). It is intended for:

  • Research on domain adaptation of LLMs for low-resource legal languages
  • Downstream fine-tuning for Ukrainian legal NLP tasks
  • Scaling law analysis of continued pretraining
  • Perplexity evaluation on Ukrainian legal text

Limitations

  • Not instruction-tuned; will not follow instructions or chat
  • Trained on Ukrainian court decisions only; may not generalize to other legal systems

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