Whether a set of gene identifiers is predominantly Ensembl accessions.
Parameters:
identifiers (object) – Iterable of gene identifiers.
min_fraction (float) – Fraction that must match the Ensembl pattern. Defaults to 0.5 rather than
1.0 because real panels carry a tail of spike-ins and custom features
that never match, and rejecting a whole panel over those would be wrong.
Returns:
True if at least min_fraction of the identifiers are Ensembl accessions.