[v1] add data converter (#9263)

tests_v1/plugins/data_plugins/test_converter.py

@@ -0,0 +1,52 @@
+# Copyright 2025 the LlamaFactory team.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import random
+
+import pytest
+from datasets import load_dataset
+
+from llamafactory.v1.config.data_args import DataArguments
+from llamafactory.v1.core.data_engine import DataEngine
+
+
+@pytest.mark.parametrize("num_samples", [16])
+def test_alpaca_converter(num_samples: int):
+    data_args = DataArguments(dataset="llamafactory/v1-sft-demo/dataset_info.yaml")
+    data_engine = DataEngine(data_args)
+    original_data = load_dataset("llamafactory/tiny-supervised-dataset", split="train")
+    indexes = random.choices(range(len(data_engine)), k=num_samples)
+    for index in indexes:
+        print(data_engine[index])
+        expected_data = {
+            "messages": [
+                {
+                    "role": "user",
+                    "content": [
+                        {"type": "text", "value": original_data[index]["instruction"] + original_data[index]["input"]}
+                    ],
+                    "loss_weight": 0.0,
+                },
+                {
+                    "role": "assistant",
+                    "content": [{"type": "text", "value": original_data[index]["output"]}],
+                    "loss_weight": 1.0,
+                },
+            ]
+        }
+        assert data_engine[index] == {"_dataset_name": "tiny_dataset", **expected_data}
+
+
+if __name__ == "__main__":
+    test_alpaca_converter(1)