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c289d87 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 | from __future__ import annotations
from typing import Dict
AA_ALPHABET = "ACDEFGHIKLMNPQRSTVWY"
def compute_sequence_features(sequence: str) -> Dict[str, float]:
"""Compute simple amino-acid composition and coarse biochemical summaries."""
seq = sequence.strip().upper()
length = max(len(seq), 1)
features: Dict[str, float] = {f"aa_frac_{aa}": seq.count(aa) / length for aa in AA_ALPHABET}
aromatic = set("FWY")
polar = set("STNQ")
charged = set("KRHDE")
features.update(
{
"seq_length": float(len(seq)),
"frac_aromatic": sum(1 for aa in seq if aa in aromatic) / length,
"frac_polar": sum(1 for aa in seq if aa in polar) / length,
"frac_charged": sum(1 for aa in seq if aa in charged) / length,
}
)
return features
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