private IVowpalWabbitMarshalAction ParseFeatureReUsable()
{
// make sure the returned action is independent of the current parsing context, so we can ship it
switch (reader.TokenType)
{
case JsonToken.Float:
return(VowpalWabbitMarshalActions.Create((double)reader.Value));
case JsonToken.Integer:
return(VowpalWabbitMarshalActions.Create((long)reader.Value));
case JsonToken.String:
return(VowpalWabbitMarshalActions.Create((string)reader.Value));
case JsonToken.Boolean:
return(VowpalWabbitMarshalActions.Create((bool)reader.Value));
case JsonToken.Comment:
case JsonToken.Null:
// probably best to ignore?
break;
case JsonToken.StartArray:
return(this.ParseFeatureArrayReUsable());
}
return(null);
}
/// <summary>
/// Expects: "1,2.2,3]" (excluding the leading [)
/// </summary>
private IVowpalWabbitMarshalAction ParseFeatureArrayReUsable()
{
var values = new float[16];
var index = 0;
while (reader.Read())
{
float val;
switch (reader.TokenType)
{
case JsonToken.Integer:
val = (float)(long)reader.Value;
break;
case JsonToken.Float:
val = (float)(double)reader.Value;
break;
case JsonToken.EndArray:
goto done;
default:
throw new VowpalWabbitJsonException(this.reader, "Unxpected token " + reader.TokenType + " while deserializing dense feature array");
}
if (index == values.Length)
{
var newValues = new float[values.Length * 2];
Array.Copy(values, newValues, values.Length);
values = newValues;
}
values[index++] = val;
}
done:
return(VowpalWabbitMarshalActions.Create(values, index));
}