Heliactis-1-4B
Heliactis means "sunbeam". It is the ancient-style form of the living Greek word ηλιαχτίδα (ηλιακτίδα), built from the ancient hḗlios ("sun") and aktís ("ray").
Full-precision weights (fp16, safetensors) of Heliactis 1, an Apollon Labs fine-tune of
XHToken/Spark-X2.5-4B.
These are the same weights as the F16 file in
ApollonLabs/Heliactis-1-4B-GGUF,
which holds the full model card: measured results, the base-model defect we reduced,
and the honest limitations. Please read it before use.
Usage
The architecture is not in transformers, so it ships as custom code:
from transformers import AutoModelForCausalLM, AutoTokenizer
tok = AutoTokenizer.from_pretrained("ApollonLabs/Heliactis-1-4B")
model = AutoModelForCausalLM.from_pretrained("ApollonLabs/Heliactis-1-4B", trust_remote_code=True)
Trained and evaluated with thinking disabled (enable_thinking=False in the chat template).
To block the 502 orphan-byte tokens, pass their ids (ban-ids.json in the GGUF repo) as a
bad-words or logit-bias list at generation time.
License and attribution
Apache 2.0, inherited from the base model XHToken/Spark-X2.5-4B.
Derivative work by Apollon Labs. The custom code files come unchanged from the base model.
Apollon Labs — Towards the Sun.