fix(model/chat): invalid increamental_output

Author: kevinlin09

samples/GenerationStreamCall.java

@@ -16,8 +16,12 @@ public class GenerationStreamCall {
   public static void streamCall()
       throws NoApiKeyException, ApiException, InputRequiredException {
     Generation gen = new Generation();
-    GenerationParam param = GenerationParam.builder().model(Generation.Models.QWEN_PLUS)
-        .prompt("就当前的海洋污染的情况，写一份限塑的倡议书提纲，需要有理有据地号召大家克制地使用塑料制品").topP(0.8).build();
+    GenerationParam param = GenerationParam.builder()
+            .model("qwen3-max")
+            .prompt("就当前的海洋污染的情况，写一份限塑的倡议书提纲，需要有理有据地号召大家克制地使用塑料制品")
+            .topP(0.8)
+            .incrementalOutput(false)
+            .build();
     Flowable<GenerationResult> result = gen.streamCall(param);
     result.blockingForEach(message -> {
       System.out.println(JsonUtils.toJson(message));

src/main/java/com/alibaba/dashscope/aigc/generation/GenerationParam.java

@@ -190,9 +190,41 @@ public Map<String, Object> getParameters() {
     if (temperature != null) {
       params.put("temperature", temperature);
     }
-    if (incrementalOutput) {
-      params.put("incremental_output", incrementalOutput);
+    // Check if model is qwen{n} where n >= 3
+    String modelName = getModel();
+    boolean isQwenVersionThreeOrHigher = false;
+    if (modelName.toLowerCase().startsWith("qwen")) {
+      String remaining = modelName.toLowerCase().substring(4);
+      try {
+        // Extract the number after "qwen"
+        StringBuilder numberStr = new StringBuilder();
+        for (char c : remaining.toCharArray()) {
+          if (Character.isDigit(c)) {
+            numberStr.append(c);
+          } else {
+            break;
+          }
+        }
+        if (numberStr.length() > 0) {
+          int version = Integer.parseInt(numberStr.toString());
+          isQwenVersionThreeOrHigher = version >= 3;
+        }
+      } catch (NumberFormatException e) {
+        // If parsing fails, use default behavior
+      }
     }
+
+    // Apply different logic based on model version
+    if (isQwenVersionThreeOrHigher) {
+      if (incrementalOutput != null) {
+        params.put("incremental_output", incrementalOutput);
+      }
+    } else {
+      if (incrementalOutput) {
+        params.put("incremental_output", incrementalOutput);
+      }
+    }
+
     if (repetitionPenalty != null) {
       params.put(REPETITION_PENALTY, repetitionPenalty);
     }