Examples with Metric org.apache.ignite.ml.selection.scoring.metric.Metric used on opensource projects

Example 1 with Metric

use of org.apache.ignite.ml.selection.scoring.metric.Metric in project ignite by apache.

the class Evaluator method initEvaluationContexts.

/**
 * Inits evaluation contexts for metrics.
 *
 * @param dataset Dataset.
 * @param metrics Metrics.
 * @return Computed contexts.
 */
@SuppressWarnings("unchecked")
private static Map<Class, EvaluationContext> initEvaluationContexts(Dataset<EmptyContext, FeatureMatrixWithLabelsOnHeapData> dataset, Metric... metrics) {
    long nonEmptyCtxsCnt = Arrays.stream(metrics).map(x -> x.makeAggregator().createInitializedContext()).filter(x -> ((EvaluationContext) x).needToCompute()).count();
    if (nonEmptyCtxsCnt == 0) {
        HashMap<Class, EvaluationContext> res = new HashMap<>();
        for (Metric m : metrics) {
            MetricStatsAggregator<Double, ?, ?> aggregator = m.makeAggregator();
            res.put(aggregator.getClass(), (EvaluationContext) m.makeAggregator().createInitializedContext());
            return res;
        }
    }
    return dataset.compute(data -> {
        Map<Class, MetricStatsAggregator> aggrs = new HashMap<>();
        for (Metric m : metrics) {
            MetricStatsAggregator<Double, ?, ?> aggregator = m.makeAggregator();
            if (!aggrs.containsKey(aggregator.getClass()))
                aggrs.put(aggregator.getClass(), aggregator);
        }
        Map<Class, EvaluationContext> aggrToEvCtx = new HashMap<>();
        aggrs.forEach((clazz, aggr) -> aggrToEvCtx.put(clazz, (EvaluationContext) aggr.createInitializedContext()));
        for (int i = 0; i < data.getLabels().length; i++) {
            LabeledVector<Double> vector = VectorUtils.of(data.getFeatures()[i]).labeled(data.getLabels()[i]);
            aggrToEvCtx.values().forEach(ctx -> ctx.aggregate(vector));
        }
        return aggrToEvCtx;
    }, (left, right) -> {
        if (left == null && right == null)
            return new HashMap<>();
        if (left == null)
            return right;
        if (right == null)
            return left;
        HashMap<Class, EvaluationContext> res = new HashMap<>();
        for (Class key : left.keySet()) {
            EvaluationContext ctx1 = left.get(key);
            EvaluationContext ctx2 = right.get(key);
            A.ensure(ctx1 != null && ctx2 != null, "ctx1 != null && ctx2 != null");
            res.put(key, ctx1.mergeWith(ctx2));
        }
        return res;
    });
}

Example 2 with Metric

use of org.apache.ignite.ml.selection.scoring.metric.Metric in project ignite by apache.

the class Evaluator method evaluate.

/**
 * Evaluate model.
 *
 * @param mdl          The model.
 * @param dataset      Dataset.
 * @param cache        Upstream cache.
 * @param preprocessor Preprocessor.
 * @param metrics      Metrics to compute.
 * @return Evaluation result.
 */
@SuppressWarnings("unchecked")
private static <K, V> EvaluationResult evaluate(IgniteModel<Vector, Double> mdl, Dataset<EmptyContext, FeatureMatrixWithLabelsOnHeapData> dataset, IgniteCache<K, V> cache, Preprocessor<K, V> preprocessor, Metric[] metrics) {
    final Map<MetricName, Metric> metricMap = new HashMap<>();
    final Map<MetricName, Class> metricToAggrCls = new HashMap<>();
    for (Metric metric : metrics) {
        MetricStatsAggregator aggregator = metric.makeAggregator();
        MetricName name = metric.name();
        metricToAggrCls.put(name, aggregator.getClass());
        metricMap.put(name, metric);
    }
    Map<MetricName, Double> res = new HashMap<>();
    final Map<Class, EvaluationContext> aggrClsToCtx = initEvaluationContexts(dataset, metrics);
    final Map<Class, MetricStatsAggregator> aggrClsToAggr = computeStats(mdl, dataset, cache, preprocessor, aggrClsToCtx, metrics);
    for (Metric metric : metrics) {
        MetricName name = metric.name();
        Class aggrCls = metricToAggrCls.get(name);
        MetricStatsAggregator aggr = aggrClsToAggr.get(aggrCls);
        res.put(name, metricMap.get(name).initBy(aggr).value());
    }
    return new EvaluationResult(res);
}

Example 3 with Metric

use of org.apache.ignite.ml.selection.scoring.metric.Metric in project ignite by apache.

the class Evaluator method initAggregators.

/**
 * Inits aggregators.
 *
 * @param ctxs    Evaluation contexts.
 * @param metrics Metrics.
 * @return Aggregators map.
 */
private static Map<Class, MetricStatsAggregator> initAggregators(Map<Class, EvaluationContext> ctxs, Metric[] metrics) {
    Map<Class, MetricStatsAggregator> aggrs = new HashMap<>();
    for (Metric m : metrics) {
        MetricStatsAggregator aggregator = m.makeAggregator();
        EvaluationContext ctx = ctxs.get(aggregator.getClass());
        A.ensure(ctx != null, "ctx != null");
        aggregator.initByContext(ctx);
        if (!aggrs.containsKey(aggregator.getClass()))
            aggrs.put(aggregator.getClass(), aggregator);
    }
    return aggrs;
}