BowLingual-E4B-v1.5
BowLingual-E4B-v1.5 is a fine-tuned Gemma 4 E4B model specialized for
English → natural conversational Thai translation, particularly informal
messaging such as LINE and Messenger.
The goal is native-sounding Thai chat rather than literal or textbook-style
machine translation.
Training data
The final SFT dataset contained 17,437 exact-deduplicated examples.
BowLingual curated gold
- 4,932 examples
- Original curated BowLingual English/Thai training data
Wisesight-derived
- 8,095 examples
- Original human-written Thai from the Wisesight sentiment corpus was preserved
- English source messages were reconstructed from the Thai using Gemma 4 31B
- Candidate reconstructions were independently scored and selected
- Thai text was never rewritten by the teacher model
SCB-MT-derived
- 4,410 examples after exact deduplication
- Original English and Thai from SCB-MT-EN-TH-2020 were preserved
- Rows were selected using strict Thai-naturalness, semantic-accuracy,
role-accuracy, modernness, and chat-suitability judging
Training
- Base:
unsloth/gemma-4-E4B-it
- Precision: BF16 LoRA
- LoRA rank: 16
- LoRA alpha: 16
- Trainable parameters: ~36.7M
- Sequence length: 2048
- Effective batch size: 16
- Epochs: 3
- Initial learning rate: 1e-4
- Scheduler: cosine
- Warmup: 3%
- Loss calculated on assistant responses only
- Best checkpoint selected by validation loss
Intended use
BowLingual-E4B-v1.5 is intended primarily for translating casual English
messages into natural conversational Thai.
It is not optimized for legal, medical, technical, or other formal translation.
Dataset provenance
Relevant upstream dataset licenses and terms still apply to their respective
source material. In particular, SCB-MT-EN-TH-2020 is distributed under
CC BY-SA 4.0. Review upstream dataset terms before redistribution or commercial
use.
