Methods Filter Bank

FilterBank & FusedChiSquareDetector -- experimental tooling

FilterBank (many streaming filters driven in lockstep) and FusedChiSquareDetector (a pooled multi-stream fault test built on them) live in dtfit_experimental.streaming -- experiment harness tooling, not part of the stable dtfit surface. See the experimental adaptations API.

The stable equivalent of the fused test is summing several ImageFilter instances' nis_: each is chi-square under its model, so the sum is chi-square with the summed degrees of freedom, giving the pooled test more degrees of freedom and power than any one filter's innovation alone when the change is spread evenly over the streams; on the three-axis damping fault of experiment 21, carried mostly by one axis, per-axis tests on every sample were as fast. See several streams.

On a flag the detector re-arms every filter: inflate= multiplies each P by the given factor and keeps the windows, rearm=True calls each filter's rearm() instead, which applies the filter's own drift_reset and collapses its adaptive window. A bank of one filter is the per-sample innovation test on a single stream.