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// Copyright 2018 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.searchlib.rankingexpression.integration.ml;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.yahoo.path.Path;
import java.io.File;
import java.util.Collection;
import java.util.Optional;
/**
* All models imported from the models/ directory in the application package
*
* @author bratseth
*/
public class ImportedModels {
/** All imported models, indexed by their names */
private final ImmutableMap<String, ImportedModel> importedModels;
private static final ImmutableList<ModelImporter> importers =
ImmutableList.of(new TensorFlowImporter(), new OnnxImporter(), new XGBoostImporter());
/** Create a null imported models */
public ImportedModels() {
importedModels = ImmutableMap.of();
}
public ImportedModels(File modelsDirectory) {
ImmutableMap.Builder<String, ImportedModel> builder = new ImmutableMap.Builder<>();
// Find all subdirectories recursively which contains a model we can read
importRecursively(modelsDirectory, builder);
importedModels = builder.build();
}
private static void importRecursively(File dir, ImmutableMap.Builder<String, ImportedModel> builder) {
if ( ! dir.isDirectory()) return;
for (File child : dir.listFiles()) {
Optional<ModelImporter> importer = findImporterOf(child);
if (importer.isPresent()) {
String name = toName(child);
builder.put(name, importer.get().importModel(name, child));
}
else {
importRecursively(child, builder);
}
}
}
private static Optional<ModelImporter> findImporterOf(File path) {
return importers.stream().filter(item -> item.canImport(path.toString())).findFirst();
}
/**
* Returns the model at the given location in the application package (lazily loaded),
*
* @param modelPath the full path to this model (file or directory, depending on model type)
* under the application package
* @throws IllegalArgumentException if the model cannot be loaded
*/
public ImportedModel get(File modelPath) {
return importedModels.get(toName(modelPath));
}
/** Returns an immutable collection of all the imported models */
public Collection<ImportedModel> all() {
return importedModels.values();
}
private static String toName(File modelFile) {
Path modelPath = Path.fromString(modelFile.toString());
if (modelFile.isFile())
modelPath = stripFileEnding(modelPath);
String localPath = concatenateAfterModelsDirectory(modelPath);
return localPath.replace('.', '_');
}
private static Path stripFileEnding(Path path) {
int dotIndex = path.last().lastIndexOf(".");
if (dotIndex <= 0) return path;
return path.withLast(path.last().substring(0, dotIndex));
}
private static String concatenateAfterModelsDirectory(Path path) {
boolean afterModels = false;
StringBuilder result = new StringBuilder();
for (String element : path.elements()) {
if (afterModels) result.append(element).append("_");
if (element.equals("models")) afterModels = true;
}
return result.substring(0, result.length()-1);
}
}
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