modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/vector/VectorNormCasesTest.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.ignite.ml.math.primitives.vector;

import java.util.Arrays;
import java.util.Collection;
import org.apache.ignite.ml.math.primitives.vector.impl.DenseVector;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;

import static org.junit.Assert.assertEquals;

/** */
@RunWith(Parameterized.class)
public class VectorNormCasesTest {
  /**
   * Precision.
   */
  private static final double PRECISION = 0.01;

  /** */
  @Parameterized.Parameters(name = "{0}")
  public static Collection<TestData> data() {
    return Arrays.asList(
        new TestData(
            new double[] {1.0, -1.0, 0.0},
            1,
            2.0
        ),
        new TestData(
            new double[] {1.0, -1.0, 0.0},
            2,
            1.41
        ),
        new TestData(
            new double[] {1.0, -1.0, 0.0},
            3,
            1.25
        ),
        new TestData(
            new double[] {1.0, -1.0, 0.0},
            4,
            1.18
        ),
        new TestData(
            new double[] {1.0, -1.0, 0.0},
            5,
            1.14
        )
    );
  }

  /** */
  private final TestData testData;

  /** */
  public VectorNormCasesTest(TestData testData) {
    this.testData = testData;
  }

  /** */
  @Test
  public void test() {
    assertEquals(
        testData.vector.kNorm(testData.p),
        testData.expRes,
        PRECISION
    );
  }

  /** */
  private static class TestData {
    /** */
    public final Vector vector;

    /** */
    public final Double p;

    /** */
    public final Double expRes;

    /** */
    private TestData(double[] vector, double p, double expRes) {
      this.vector = new DenseVector(vector);
      this.p = p;
      this.expRes = expRes;
    }

    /** {@inheritDoc} */
    @Override public String toString() {
      return String.format("norm(%s, %s) = %s",
          Arrays.toString(vector.asArray()),
          p,
          expRes
      );
    }
  }
}