From f99ef6d4d400be906d26fbf59762bc27553ed32b Mon Sep 17 00:00:00 2001
From: Lester Solbakken <lesters@oath.com>
Date: Thu, 12 Dec 2019 09:42:54 -0800
Subject: Initial conversion of TF to ONNX for testing

---
 .../importer/tensorflow/TensorFlowImporter.java    | 43 ++++++++++++++++++++++
 1 file changed, 43 insertions(+)

(limited to 'model-integration/src/main')

diff --git a/model-integration/src/main/java/ai/vespa/rankingexpression/importer/tensorflow/TensorFlowImporter.java b/model-integration/src/main/java/ai/vespa/rankingexpression/importer/tensorflow/TensorFlowImporter.java
index 2a406f92756..96ea58edc61 100644
--- a/model-integration/src/main/java/ai/vespa/rankingexpression/importer/tensorflow/TensorFlowImporter.java
+++ b/model-integration/src/main/java/ai/vespa/rankingexpression/importer/tensorflow/TensorFlowImporter.java
@@ -4,10 +4,17 @@ package ai.vespa.rankingexpression.importer.tensorflow;
 import ai.vespa.rankingexpression.importer.ImportedModel;
 import ai.vespa.rankingexpression.importer.IntermediateGraph;
 import ai.vespa.rankingexpression.importer.ModelImporter;
+import ai.vespa.rankingexpression.importer.onnx.OnnxImporter;
+import com.yahoo.collections.Pair;
+import com.yahoo.io.IOUtils;
+import com.yahoo.system.ProcessExecuter;
 import org.tensorflow.SavedModelBundle;
 
 import java.io.File;
 import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.logging.Logger;
 
 /**
  * Converts a saved TensorFlow model into a ranking expression and set of constants.
@@ -17,6 +24,12 @@ import java.io.IOException;
  */
 public class TensorFlowImporter extends ModelImporter {
 
+    private static final Logger log = Logger.getLogger(TensorFlowImporter.class.getName());
+
+    private final static int defaultOnnxOpset = 8;
+
+    private final OnnxImporter onnxImporter = new OnnxImporter();
+
     @Override
     public boolean canImport(String modelPath) {
         File modelDir = new File(modelPath);
@@ -39,6 +52,10 @@ public class TensorFlowImporter extends ModelImporter {
      */
     @Override
     public ImportedModel importModel(String modelName, String modelDir) {
+        // Temporary (for testing): if path contains "tf_2_onnx", convert to ONNX then import that model.
+        if (modelDir.contains("tf_2_onnx")) {
+            return convertToOnnxAndImport(modelName, modelDir);
+        }
         try (SavedModelBundle model = SavedModelBundle.load(modelDir, "serve")) {
             return importModel(modelName, modelDir, model);
         }
@@ -58,5 +75,31 @@ public class TensorFlowImporter extends ModelImporter {
         }
     }
 
+    private ImportedModel convertToOnnxAndImport(String modelName, String modelDir) {
+        Path tempDir = null;
+        try {
+            log.info("Converting TensorFlow model '" + modelDir + "' to ONNX...");
+            tempDir = Files.createTempDirectory("tf2onnx");
+            String convertedPath = tempDir.toString() + File.separatorChar + "converted.onnx";
+            Pair<Integer, String> res = convertToOnnx(modelDir, convertedPath, defaultOnnxOpset);
+            if (res.getFirst() != 0) {
+                throw new IllegalArgumentException("Conversion from TensorFlow to ONNX failed for '" + modelDir + "'. " +
+                        "Reason: " + res.getSecond());
+            }
+            return onnxImporter.importModel(modelName, convertedPath);
+        } catch (IOException e) {
+            throw new IllegalArgumentException("Conversion from TensorFlow to ONNX failed for '" + modelDir + "'");
+        } finally {
+            if (tempDir != null) {
+                IOUtils.recursiveDeleteDir(tempDir.toFile());
+            }
+        }
+    }
+
+    private Pair<Integer, String> convertToOnnx(String savedModel, String output, int opset) throws IOException {
+        ProcessExecuter executer = new ProcessExecuter();
+        String job = "python3 -m tf2onnx.convert --saved-model " + savedModel + " --output " + output + " --opset " + opset;
+        return executer.exec(job);
+    }
 
 }
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