Parse() public method

Parses the example.
public Parse ( JsonReader reader, ILabel label = null, int index = null ) : void
reader Newtonsoft.Json.JsonReader The example to parse.
label ILabel /// Optional label, taking precedence over "_label" property found in . /// If null, will be inspected and the "_label" property used as label. ///
index int Optional index of example the given label should be applied for multi-line examples.
return void
VowpalWabbitJsonSerializer Class Documentation
コード例 #1
0
        public void Validate(string line, string json, IVowpalWabbitLabelComparator labelComparator = null, ILabel label = null)
        {
            using (var strExample = this.vw.ParseLine(line))
            using (var jsonSerializer = new VowpalWabbitJsonSerializer(this.vw))
            {
                jsonSerializer.Parse(json, label);
                using (var jsonExample = jsonSerializer.CreateExample())
                using (var strJsonExample = this.vw.ParseLine(jsonExample.VowpalWabbitString))
                {
                    var diff = strExample.Diff(this.vw, jsonExample, labelComparator);
                    Assert.IsNull(diff, diff + " generated string: '" + jsonExample.VowpalWabbitString + "'");

                    diff = strExample.Diff(this.vw, strJsonExample, labelComparator);
                    Assert.IsNull(diff, diff);
                }
            }
        }
コード例 #2
0
ファイル: TestJson.cs プロジェクト: gramhagen/vowpal_wabbit 
        public void TestJsonLabelExtraction()
        {
            using (var vw = new VowpalWabbit("--cb_adf --rank_all"))
            {
                using (var jsonSerializer = new VowpalWabbitJsonSerializer(vw))
                {
                    string eventId = null;
                    jsonSerializer.RegisterExtension((state, property) =>
                    {
                        Assert.AreEqual(property, "_eventid");
                        Assert.IsTrue(state.Reader.Read());

                        eventId = (string)state.Reader.Value;
                        return true;
                    });

                    jsonSerializer.Parse("{\"_eventid\":\"abc123\",\"a\":1,\"_label_cost\":-1,\"_label_probability\":0.3}");

                    Assert.AreEqual("abc123", eventId);

                    using (var examples = jsonSerializer.CreateExamples())
                    {
                        var single = examples as VowpalWabbitSingleLineExampleCollection;
                        Assert.IsNotNull(single);

                        var label = single.Example.Label as ContextualBanditLabel;
                        Assert.IsNotNull(label);

                        Assert.AreEqual(-1, label.Cost);
                        Assert.AreEqual(0.3, label.Probability, 0.0001);
                    }
                }

                using (var jsonSerializer = new VowpalWabbitJsonSerializer(vw))
                {
                    jsonSerializer.Parse("{\"_multi\":[{\"_text\":\"w1 w2\", \"a\":{\"x\":1}}, {\"_text\":\"w2 w3\"}], \"_labelindex\":1, \"_label_cost\":-1, \"_label_probability\":0.3}");

                    using (var examples = jsonSerializer.CreateExamples())
                    {
                        var multi = examples as VowpalWabbitMultiLineExampleCollection;
                        Assert.IsNotNull(multi);

                        Assert.AreEqual(2, multi.Examples.Length);
                        var label = multi.Examples[0].Label as ContextualBanditLabel;
                        Assert.AreEqual(0, label.Cost);
                        Assert.AreEqual(0, label.Probability);

                        label = multi.Examples[1].Label as ContextualBanditLabel;
                        Assert.IsNotNull(label);

                        Assert.AreEqual(-1, label.Cost);
                        Assert.AreEqual(0.3, label.Probability, 0.0001);
                    }
                }
            }
        }