Examples of ca.nengo.math.impl.NumericallyDifferentiableFunction

ca.nengo.math.impl.NumericallyDifferentiableFunction
A wrapper around any Function that provides a numerical approximation of its derivative, so that it can be used as a DifferentiableFunction. A Function should provide its exact derivative if available, rather than forcing callers to rely on this wrapper. TODO: test @author Bryan Tripp

  /*
   * Test method for 'ca.nengo.math.impl.NumericallyDifferentiableFunction.getDimension()'
   */
  public void testGetDimension() {
    SigmoidFunction f = new SigmoidFunction();
    NumericallyDifferentiableFunction wrap = new NumericallyDifferentiableFunction(f, 0, 0.1f);
    assertEquals(f.getDimension(), wrap.getDimension());
    assertEquals(1, wrap.getDimension());
  }

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  /*
   * Test method for 'ca.nengo.math.impl.NumericallyDifferentiableFunction.map(float[])'
   */
  public void testMap() {
    SigmoidFunction f = new SigmoidFunction();
    NumericallyDifferentiableFunction wrap = new NumericallyDifferentiableFunction(f, 0, 0.1f);
    
    assertEquals(wrap.map(new float[]{0}), f.map(new float[]{0}));
    assertEquals(wrap.map(new float[]{3}), f.map(new float[]{3}));
    assertEquals(wrap.map(new float[]{100}), f.map(new float[]{100}));
  }

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  /*
   * Test method for 'ca.nengo.math.impl.NumericallyDifferentiableFunction.multiMap(float[][])'
   */
  public void testMultiMap() {
    SigmoidFunction f = new SigmoidFunction();
    NumericallyDifferentiableFunction wrap = new NumericallyDifferentiableFunction(f, 0, 0.1f);


    float[] values = f.multiMap(new float[][]{new float[]{3}, new float[]{-2}});
    float[] newVals = wrap.multiMap(new float[][]{new float[]{3}, new float[]{-2}});
    assertEquals(values[0],newVals[0]);
    assertEquals(values[1],newVals[1]);
  }

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   *   Test method for 'ca.nengo.math.impl.NumericallyDifferentiableFunction.getDerivative()'
   */
  public void testGetDerivative() {
    SigmoidFunction f = new SigmoidFunction(-1f,0.5f,1f,2f);
    Function g = f.getDerivative();
    NumericallyDifferentiableFunction wrap = new NumericallyDifferentiableFunction(f, 0, 0.01f);
    Function gWrap = wrap.getDerivative();
    
    assertEquals(gWrap.getDimension(), g.getDimension());
    TestUtil.assertClose(gWrap.map(new float[]{0f}), g.map(new float[]{0f}), .0001f);
    TestUtil.assertClose(gWrap.map(new float[]{-1f}), g.map(new float[]{-1f}), .0001f);
    TestUtil.assertClose(gWrap.map(new float[]{3f}), g.map(new float[]{3f}), .0001f);

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  /*
   * Test method for 'ca.nengo.math.impl.NumericallyDifferentiableFunction.getDimension()'
   */
  public void testGetDimension() {
    SigmoidFunction f = new SigmoidFunction();
    NumericallyDifferentiableFunction wrap = new NumericallyDifferentiableFunction(f, 0, 0.1f);
    assertEquals(f.getDimension(), wrap.getDimension());
    assertEquals(1, wrap.getDimension());
  }

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  /*
   * Test method for 'ca.nengo.math.impl.NumericallyDifferentiableFunction.map(float[])'
   */
  public void testMap() {
    SigmoidFunction f = new SigmoidFunction();
    NumericallyDifferentiableFunction wrap = new NumericallyDifferentiableFunction(f, 0, 0.1f);
    
    assertEquals(wrap.map(new float[]{0}), f.map(new float[]{0}));
    assertEquals(wrap.map(new float[]{3}), f.map(new float[]{3}));
    assertEquals(wrap.map(new float[]{100}), f.map(new float[]{100}));
  }

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  /*
   * Test method for 'ca.nengo.math.impl.NumericallyDifferentiableFunction.multiMap(float[][])'
   */
  public void testMultiMap() {
    SigmoidFunction f = new SigmoidFunction();
    NumericallyDifferentiableFunction wrap = new NumericallyDifferentiableFunction(f, 0, 0.1f);


    float[] values = f.multiMap(new float[][]{new float[]{3}, new float[]{-2}});
    float[] newVals = wrap.multiMap(new float[][]{new float[]{3}, new float[]{-2}});
    assertEquals(values[0],newVals[0]);
    assertEquals(values[1],newVals[1]);
  }

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   *   Test method for 'ca.nengo.math.impl.NumericallyDifferentiableFunction.getDerivative()'
   */
  public void testGetDerivative() {
    SigmoidFunction f = new SigmoidFunction(-1f,0.5f,1f,2f);
    Function g = f.getDerivative();
    NumericallyDifferentiableFunction wrap = new NumericallyDifferentiableFunction(f, 0, 0.01f);
    Function gWrap = wrap.getDerivative();
    
    assertEquals(gWrap.getDimension(), g.getDimension());
    TestUtil.assertClose(gWrap.map(new float[]{0f}), g.map(new float[]{0f}), .0001f);
    TestUtil.assertClose(gWrap.map(new float[]{-1f}), g.map(new float[]{-1f}), .0001f);
    TestUtil.assertClose(gWrap.map(new float[]{3f}), g.map(new float[]{3f}), .0001f);

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Related Classes of ca.nengo.math.impl.NumericallyDifferentiableFunction

ca.nengo.math.impl.NumericallDifferentiableFunctionTest

ca.nengo.math.impl.NumericallyDifferentiableFunctionTest

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