# Configuring metrics for ap_verify¶

ap_verify handles metrics through the MetricTask framework. Each metric has an associated MetricTask, typically in the package associated with the metric. For example, the code for computing ip_diffim.numSciSources can be found in the ip_diffim package, not in ap_verify.

The metrics computed by ap_verify are configured through two command-line options, --image-metrics-config and --dataset-metrics-config. These options each take a config file for a MetricsControllerConfig, the former for metrics that are computed over individual images and the latter for metrics that apply to the entire dataset. Typically, a file configures each metric through config.measurers[<name>]; see the documentation for MetricsControllerTask for examples.

The ap_verify package provides two config files in the config/ directory, which define the image- and dataset-level configs that are run by default (for example, during CI). These files feature complex logic to minimize code duplication and minimize the work in adding new metrics. This complexity is not required by MetricsControllerTask; a config that’s just a list of assignments will also work.