task_charts__matrix__axis_extremum_label

Contract

1. Domain: charts
2. Scene id: matrix
3. Source implementation scene: charts/matrix
4. Supported query_id values: row_highest_axis_extremum_label, row_lowest_axis_extremum_label, column_highest_axis_extremum_label, column_lowest_axis_extremum_label
5. Query ids bind the prompt-visible row/column axis and highest/lowest direction. The selected row/column label and numeric matrix values are sampled generation metadata.

Implementation

1. Registered class: trace_tasks.tasks.charts.matrix.axis_extremum_label.ChartsMatrixAxisExtremumLabelTask
2. Prompt lookup domain/scene: charts/matrix
3. Generation is deterministic from instance_seed, explicit params, prompt bundle, renderer config, and code versions.
4. Answers and annotation are produced from the same metadata execution trace.

Annotation Contract

1. Answer schema: string_label.
2. Annotation schema: bbox_set.
3. Annotation marks all active candidate cells in the selected row or column.
4. If the answer is unanswerable, annotation is an empty bbox_set.
5. Matrix headers, legends, titles, and distractor text are context unless the task explicitly asks for them as annotation.

Program Contract

Program: select_label(arg_ranked_extreme(line_cells(axis={row,column}, axis_label), value(cell), rank=2, direction={highest,lowest})); output=string_label|unanswerable; annotation=bbox_set(candidate_line_cells); scene=matrix; scope=axis_extremum_label

Candidate set: the visible matrix cells with row and column labels inside the axis_extremum_label objective scope. Operands: prompt-bound labels, categories, series names, thresholds, intervals, references, and encoded chart values, plus the active query id's comparator, direction, target role, or extremum focus when present. Operation: evaluate select_label over the candidate set using the filters, comparisons, aggregations, rankings, projections, or counterfactual edits named in the program expression; generation enforces a unique final answer. Output binding: answer is the string_label value bound by string_label|unanswerable. Annotation witnesses: bbox_set witnesses bound by bbox_set(candidate_line_cells). Annotation marks all active candidate cells in the selected row or column. If the answer is unanswerable, annotation is an empty bbox_set. Matrix headers, legends, titles, and distractor text are context unless the task explicitly asks for them as annotation. Query ids: row_highest_axis_extremum_label, row_lowest_axis_extremum_label, column_highest_axis_extremum_label, column_lowest_axis_extremum_label.

Reasoning Operations

Families: ranking

Query Details

Query id	Program signature	Answer schema	Annotation schema
row_highest_axis_extremum_label	selection.matrix_axis_ranked_extreme(axis=row,direction=highest)	string_label	bbox_set
row_lowest_axis_extremum_label	selection.matrix_axis_ranked_extreme(axis=row,direction=lowest)	string_label	bbox_set
column_highest_axis_extremum_label	selection.matrix_axis_ranked_extreme(axis=column,direction=highest)	string_label	bbox_set
column_lowest_axis_extremum_label	selection.matrix_axis_ranked_extreme(axis=column,direction=lowest)	string_label	bbox_set