When an inference is based not on causation but on the uniformity of co-existence, what is it called according to the classical Indian school of logic?

An inference resting on the uniformity of co-existence rather than causation is samanyatodrsta.

Here the middle and major are linked not as cause and effect but by regular concomitance.

The mark and the probandum are always found together, though neither produces the other.

This non-causal, general observation grounds the universal relation.

Such co-existence-based inference is named samanyatodrsta.