Question

我们正在使用H2O 3.10.4.7开发Java程序，我们需要检索有关框架中所有列的元数据，例如列名和数据类型。相关问题（未解决，问题不同）here。

我们的期望是water.bindings.H2oApi客户端就像REST端点一样工作，我们想要使用Javadoc中描述的H2oApi方法frameColumns(FrameKeyV3 frameId)：

＆＃34;返回Frame中的所有列。＆＃34;

但结果不包含任何与列相关的信息。当我们通过浏览器使用REST端点时，我们会像预期的那样获得有关帧中列的详细信息。例子：

H2oApi：

FramesV3 params = new FramesV3();
params.frameId = stringToKey(frame, FrameKeyV3.class); // "frame" reference from import process, works

// try with frameColumns()
FramesV3 frameColumns = api.frameColumns(params);
System.out.println(frameColumns.toString()); // "columns" not included in JSON response

结果：

{
   "column":"",
   "row_offset":0,
   "row_count":0,
   "column_offset":0,
   "column_count":0,
   "find_compatible_models":false,
   "path":"",
   "force":false,
   "num_parts":1,
   "frames":[
      {
         "frame_id":{
            "name":"3d257aae-7266-48a1-8f35-1243436616ab",
            "type":"Key\u003cFrame\u003e",
            "URL":"/3/Frames/3d257aae-7266-48a1-8f35-1243436616ab"
         },
         "byte_size":1928,
         "is_text":false,
         "_exclude_fields":""
      }
   ],
   "_exclude_fields":""
}

REST端点：

http://localhost:54321/3/Frames/3d257aae-7266-48a1-8f35-1243436616ab/columns

结果：

{

    "__meta": {
        "schema_version": 3,
        "schema_name": "FramesV3",
        "schema_type": "Frames"
    },
    "_exclude_fields": "",
    "row_offset": 0,
    "row_count": 0,
    "column_offset": 0,
    "column_count": 0,
    "job": null,
    "frames": [
        {
            "__meta": {
                "schema_version": 3,
                "schema_name": "FrameV3",
                "schema_type": "Frame"
            },
            "_exclude_fields": "",
            "frame_id": {
                "__meta": {
                    "schema_version": 3,
                    "schema_name": "FrameKeyV3",
                    "schema_type": "Key<Frame>"
                },
                "name": "3d257aae-7266-48a1-8f35-1243436616ab",
                "type": "Key<Frame>",
                "URL": "/3/Frames/3d257aae-7266-48a1-8f35-1243436616ab"
            },
            "byte_size": 1928,
            "is_text": false,
            "row_offset": 0,
            "row_count": 100,
            "column_offset": 0,
            "column_count": 5,
            "total_column_count": 5,
            "checksum": -7731554748204616990,
            "rows": 150,
            "num_columns": 5,
            "default_percentiles": [
                0.001,
                0.01,
                0.1,
                0.2,
                0.25,
                0.3,
                0.3333333333333333,
                0.4,
                0.5,
                0.6,
                0.6666666666666666,
                0.7,
                0.75,
                0.8,
                0.9,
                0.99,
                0.999
            ],
            "columns": [
                {
                    "__meta": {
                        "schema_version": 3,
                        "schema_name": "ColV3",
                        "schema_type": "Vec"
                    },
                    "label": "sepal_length",
                    "missing_count": 0,
                    "zero_count": 0,
                    "positive_infinity_count": 0,
                    "negative_infinity_count": 0,
                    "mins": [
                        4.3,
                        4.4,
                        4.4,
                        4.4,
                        4.5
                    ],
                    "maxs": [
                        7.9,
                        7.7,
                        7.7,
                        7.7,
                        7.7
                    ],
                    "mean": 5.843333333333334,
                    "sigma": 0.8280661279778637,
                    "type": "real",
                    "domain": null,
                    "domain_cardinality": 0,
                    "data": [ ... ]
            "string_data": null,
            "precision": 1,
            "histogram_bins": null,
            "histogram_base": 0.0,
            "histogram_stride": 0.0,?
            "percentiles": null
    ...
}

我们对JSON实体感兴趣＆＃34;列＆＃34;检索我们需要的元数据，但H2o Java Api不提供它。

祝你好运！

尼科

Answer 1

正如评论中所提到的 - 这似乎是与我们如何使用Retrofit相关的错误，请创建问题in our JIRA。您可以在其中指向此Retrofit issue。另外，请在H2O-3 gitter频道上发布JIRA链接。

H2oApi Java绑定列端点不返回列元数据

1 个答案: