[rust] Support load DJL model for RsModel

api/src/main/java/ai/djl/BaseModel.java

@@ -234,6 +234,28 @@ protected void setModelDir(Path modelDir) {
         this.modelDir = Utils.getNestedModelDir(modelDir);
     }
 
+    protected void loadBlock(String prefix, Map<String, ?> options)
+            throws IOException, MalformedModelException {
+        boolean hasParameter = true;
+        if (options != null) {
+            String paramOption = (String) options.get("hasParameter");
+            if (paramOption != null) {
+                hasParameter = Boolean.parseBoolean(paramOption);
+            }
+        }
+        if (hasParameter) {
+            Path paramFile = paramPathResolver(prefix, options);
+            if (paramFile == null) {
+                throw new IOException(
+                        "Parameter file not found in: "
+                                + modelDir
+                                + ". If you only specified model path, make sure path name"
+                                + " match your saved model file name.");
+            }
+            readParameters(paramFile, options);
+        }
+    }
+
     /** {@inheritDoc} */
     @Override
     public void save(Path modelPath, String newModelName) throws IOException {

api/src/main/java/ai/djl/ndarray/types/Shape.java

@@ -548,7 +548,8 @@ public static PairList<DataType, Shape> parseShapes(String value) {
         PairList<DataType, Shape> inputShapes = new PairList<>();
         if (value != null) {
             if (value.contains("(")) {
-                Pattern pattern = Pattern.compile("\\((\\s*(\\d+)([,\\s]+\\d+)*\\s*)\\)(\\w?)");
+                Pattern pattern =
+                        Pattern.compile("\\((\\s*([-\\d]+)([,\\s]+[-\\d]+)*\\s*)\\)(\\w?)");
                 Matcher matcher = pattern.matcher(value);
                 while (matcher.find()) {
                     String[] tokens = matcher.group(1).split(",");

api/src/main/java/ai/djl/nn/Blocks.java

@@ -98,13 +98,19 @@ public static Block identityBlock() {
     public static Block onesBlock(PairList<DataType, Shape> shapes, String[] names) {
         return new LambdaBlock(
                 a -> {
+                    Shape[] inShapes = a.getShapes();
                     NDManager manager = a.getManager();
                     NDList list = new NDList(shapes.size());
                     int index = 0;
                     for (Pair<DataType, Shape> pair : shapes) {
+                        long[] shape = pair.getValue().getShape().clone();
+                        for (int i = 0; i < shape.length; ++i) {
+                            if (shape[i] == -1) {
+                                shape[i] = inShapes[index].get(i);
+                            }
+                        }
                         DataType dataType = pair.getKey();
-                        Shape shape = pair.getValue();
-                        NDArray arr = manager.ones(shape, dataType);
+                        NDArray arr = manager.ones(new Shape(shape), dataType);
                         if (names.length == list.size()) {
                             arr.setName(names[index++]);
                         }

engines/pytorch/pytorch-engine/src/main/java/ai/djl/pytorch/engine/PtModel.java

@@ -115,24 +115,7 @@ public void load(Path modelPath, String prefix, Map<String, ?> options)
              */
             block.freezeParameters(!trainParam);
         } else {
-            boolean hasParameter = true;
-            if (options != null) {
-                String paramOption = (String) options.get("hasParameter");
-                if (paramOption != null) {
-                    hasParameter = Boolean.parseBoolean(paramOption);
-                }
-            }
-            if (hasParameter) {
-                Path paramFile = paramPathResolver(prefix, options);
-                if (paramFile == null) {
-                    throw new IOException(
-                            "Parameter file not found in: "
-                                    + modelDir
-                                    + ". If you only specified model path, make sure path name"
-                                    + " match your saved model file name.");
-                }
-                readParameters(paramFile, options);
-            }
+            loadBlock(prefix, options);
         }
     }
 

extensions/tokenizers/src/main/java/ai/djl/engine/rust/RsModel.java

@@ -48,8 +48,12 @@ public void load(Path modelPath, String prefix, Map<String, ?> options)
             throw new FileNotFoundException(
                     "Model directory doesn't exist: " + modelPath.toAbsolutePath());
         }
-        modelDir = modelPath.toAbsolutePath();
-        long handle = RustLibrary.loadModel(modelDir.toString(), dataType.ordinal());
-        block = new RsSymbolBlock((RsNDManager) manager, handle);
+        setModelDir(modelPath);
+        if (block == null) {
+            long handle = RustLibrary.loadModel(modelDir.toString(), dataType.ordinal());
+            block = new RsSymbolBlock((RsNDManager) manager, handle);
+        } else {
+            loadBlock(prefix, options);
+        }
     }
 }