/**
* Convert a collection of hyper-parameter search arrays into a double- dimension
* array-of-doubles. Missing hyper parms will be filled in with the default value.
*
* @param hypers A set of {hyper-parameter field names, search space values}
* @return The same set as a double[][]
*/
private double[][] hyper2doubles(Map<String, Object[]> hypers) {
String[] ss = hyperNames();
double[] defs = hyperDefaults();
double[][] dss = new double[ss.length][];
int cnt = 0; // Count of found hyper parameters
for (int i = 0; i < ss.length; i++) { // For all hyper-names
Object[] os = hypers != null ? hypers.get(ss[i]) : null; // Get an array-of-something
if (os == null) os = new Object[] {defs[i]}; // Missing? Use default
else cnt++; // Found a hyper parameter
double[] ds = dss[i] = new double[os.length]; // Array of params for search
for (int j = 0; j < os.length; j++) ds[j] = ReflectionUtils.asDouble(os[j]);
}
if (hypers != null && cnt != hypers.size()) // Quicky error check for unknow parms
for (String s : hypers.keySet())
if (ArrayUtils.find(ss, s) == -1)
throw new IllegalArgumentException("Unkown hyper-parameter " + s);
return dss;
}
/** Factory method to create the model-specific parameters schema. */
public final P createParametersSchema() {
// special case, because ModelBuilderSchema is the top of the tree and is parameterized
// differently
if (ModelBuilderSchema.class == this.getClass()) {
return (P) new ModelParametersSchemaV3();
}
try {
Class<? extends ModelParametersSchemaV3> parameters_class =
ReflectionUtils.findActualClassParameter(this.getClass(), 2);
return (P) parameters_class.newInstance();
} catch (Exception e) {
throw H2O.fail(
"Caught exception trying to instantiate a builder instance for ModelBuilderSchema: "
+ this
+ ": "
+ e,
e);
}
}