spacr.qt.screens.classify

Model-evaluation and interpretation views integrated with Classify.

The Classify masthead provides direct access to three related modules:

• Classifier Evaluation reports held-out predictions, nested cross-validation, calibration, leakage checks and per-plate metrics from a saved evaluation bundle.

• Explain CV Model reports feature gain, held-out permutation importance and SHAP values for classifiers trained on measured features.

• Activation maps image regions associated with predictions from an image classifier.

Each module opens as a complete page beside the Classify settings. The shared page and signal integration is implemented by spacr.qt.screens.map_barcodes.

Classes

LazyFlowViewSection

A collapsed Classify footer that pays for FlowView only when opened.

Functions

install_flowview(→ Optional[LazyFlowViewSection])	Mount Classify's lazy FlowView box directly below its settings.
install_folds(...)	Put Classify's FlowView footer and fold strip on screen.

Module Contents

class spacr.qt.screens.classify.LazyFlowViewSection(screen: PySide6.QtWidgets.QWidget, parent: PySide6.QtWidgets.QWidget | None = None)

Bases: spacr.qt.widgets.collapsible_section.CollapsibleSection

A collapsed Classify footer that pays for FlowView only when opened.

The empty content passed to CollapsibleSection is deliberate: importing the graphics renderer constructs a sizeable Qt/scientific dependency tree. Classify gets only this small header on first paint; the panel, its scene and the approved preview graph arrive on the first expansion.

Parameters:

• screen – the Classify screen this footer belongs to. Read on the first EXPANSION rather than here, which is the whole point of the class: nothing about FlowView is imported until someone opens it.

• parent – parent widget.

Build the FlowView section’s body without building FlowView itself.

The screen is held weakly: this section outlives nothing, but a strong reference from a lazily-built child back to its screen is how a closed module stays alive.

Parameters:

• screen – the screen the section belongs to.

• parent – parent widget for the body, or None.

hideEvent(event) → None

A cached Classify page must spend no cycles while hidden.

Parameters:

event – the hide event; it is passed on to the base class unchanged.

panel()

Return the constructed renderer, or None before first open.

showEvent(event) → None

Resume rendering only for an actually open, visible section.

Parameters:

event – the show event; it is passed on to the base class unchanged.

shutdown() → None

Stop and release renderer-owned Qt objects during screen teardown.

spacr.qt.screens.classify.install_flowview(screen: PySide6.QtWidgets.QWidget) → LazyFlowViewSection | None

Mount Classify’s lazy FlowView box directly below its settings.

Parameters:

screen – the host screen; nothing is mounted unless its app_key is 'classify_merged' and it has a _settings_content widget with a layout.

spacr.qt.screens.classify.install_folds(screen: PySide6.QtWidgets.QWidget) → spacr.qt.widgets.fold_strip.FoldStrip | None

Put Classify’s FlowView footer and fold strip on screen.

Parameters:

screen – the Classify screen that receives the FlowView section and the fold strip.