public void NgramWorkout()
{
string sentimentDataPath = GetDataPath("wikipedia-detox-250-line-data.tsv");
var data = TextLoaderStatic.CreateLoader(ML, ctx => (
label: ctx.LoadBool(0),
text: ctx.LoadText(1)), hasHeader: true)
.Load(sentimentDataPath);
var invalidData = TextLoaderStatic.CreateLoader(ML, ctx => (
label: ctx.LoadBool(0),
text: ctx.LoadFloat(1)), hasHeader: true)
.Load(sentimentDataPath);
var est = new WordTokenizingEstimator(ML, "text", "text")
.Append(new ValueToKeyMappingEstimator(ML, "terms", "text"))
.Append(new NgramExtractingEstimator(ML, "ngrams", "terms"))
.Append(new NgramHashingEstimator(ML, "ngramshash", "terms"));
TestEstimatorCore(est, data.AsDynamic, invalidInput: invalidData.AsDynamic);
var outputPath = GetOutputPath("Text", "ngrams.tsv");
var savedData = ML.Data.TakeRows(est.Fit(data.AsDynamic).Transform(data.AsDynamic), 4);
savedData = ML.Transforms.SelectColumns("text", "terms", "ngrams", "ngramshash").Fit(savedData).Transform(savedData);
using (var fs = File.Create(outputPath))
ML.Data.SaveAsText(savedData, fs, headerRow: true, keepHidden: true);
CheckEquality("Text", "ngrams.tsv");
Done();
}
public void TokenizeWithSeparators()
{
string dataPath = GetDataPath("wikipedia-detox-250-line-data.tsv");
var data = TextLoaderStatic.CreateReader(Env, ctx => (
label: ctx.LoadBool(0),
text: ctx.LoadText(1)), hasHeader: true)
.Read(dataPath).AsDynamic;
var est = new WordTokenizingEstimator(Env, "text", "words", separators: new[] { ' ', '?', '!', '.', ',' });
var outdata = TakeFilter.Create(Env, est.Fit(data).Transform(data), 4);
var savedData = ColumnSelectingTransformer.CreateKeep(Env, outdata, new[] { "words" });
var saver = new TextSaver(Env, new TextSaver.Arguments {
Silent = true
});
var outputPath = GetOutputPath("Text", "tokenizedWithSeparators.tsv");
using (var ch = Env.Start("save"))
{
using (var fs = File.Create(outputPath))
DataSaverUtils.SaveDataView(ch, saver, savedData, fs, keepHidden: true);
}
CheckEquality("Text", "tokenizedWithSeparators.tsv");
Done();
}
public void TextTokenizationWorkout()
{
string sentimentDataPath = GetDataPath("wikipedia-detox-250-line-data.tsv");
var data = TextLoaderStatic.CreateReader(ML, ctx => (
label: ctx.LoadBool(0),
text: ctx.LoadText(1)), hasHeader: true)
.Read(sentimentDataPath);
var invalidData = TextLoaderStatic.CreateReader(ML, ctx => (
label: ctx.LoadBool(0),
text: ctx.LoadFloat(1)), hasHeader: true)
.Read(sentimentDataPath);
var est = new WordTokenizingEstimator(ML, "words", "text")
.Append(new TokenizingByCharactersEstimator(ML, "chars", "text"))
.Append(new KeyToValueMappingEstimator(ML, "chars"));
TestEstimatorCore(est, data.AsDynamic, invalidInput: invalidData.AsDynamic);
var outputPath = GetOutputPath("Text", "tokenized.tsv");
var savedData = ML.Data.TakeRows(est.Fit(data.AsDynamic).Transform(data.AsDynamic), 4);
savedData = ColumnSelectingTransformer.CreateKeep(ML, savedData, new[] { "text", "words", "chars" });
using (var fs = File.Create(outputPath))
ML.Data.SaveAsText(savedData, fs, headerRow: true, keepHidden: true);
CheckEquality("Text", "tokenized.tsv");
Done();
}
public void TokenizeWithSeparators()
{
string dataPath = GetDataPath("wikipedia-detox-250-line-data.tsv");
var data = ML.Data.LoadFromTextFile(dataPath, new[] {
new TextLoader.Column("label", DataKind.Boolean, 0),
new TextLoader.Column("text", DataKind.String, 1)
},
hasHeader: true);
var est = new WordTokenizingEstimator(Env, "words", "text", separators: new[] { ' ', '?', '!', '.', ',' });
var outdata = ML.Data.TakeRows(est.Fit(data).Transform(data), 4);
var savedData = ML.Transforms.SelectColumns("words").Fit(outdata).Transform(outdata);
var saver = new TextSaver(Env, new TextSaver.Arguments {
Silent = true
});
var outputPath = GetOutputPath("Text", "tokenizedWithSeparators.tsv");
using (var ch = Env.Start("save"))
{
using (var fs = File.Create(outputPath))
DataSaverUtils.SaveDataView(ch, saver, savedData, fs, keepHidden: true);
}
CheckEquality("Text", "tokenizedWithSeparators.tsv");
Done();
}
public void TextTokenizationWorkout()
{
string sentimentDataPath = GetDataPath("wikipedia-detox-250-line-data.tsv");
var data = ML.Data.LoadFromTextFile(sentimentDataPath, new[] {
new TextLoader.Column("label", DataKind.Boolean, 0),
new TextLoader.Column("text", DataKind.String, 1)
},
hasHeader: true);
var invalidData = ML.Data.LoadFromTextFile(sentimentDataPath, new[] {
new TextLoader.Column("label", DataKind.Boolean, 0),
new TextLoader.Column("text", DataKind.Single, 1)
},
hasHeader: true);
var est = new WordTokenizingEstimator(ML, "words", "text")
.Append(new TokenizingByCharactersEstimator(ML, "chars", "text"))
.Append(new KeyToValueMappingEstimator(ML, "chars"));
TestEstimatorCore(est, data, invalidInput: invalidData);
var outputPath = GetOutputPath("Text", "tokenized.tsv");
var savedData = ML.Data.TakeRows(est.Fit(data).Transform(data), 4);
savedData = ML.Transforms.SelectColumns("text", "words", "chars").Fit(savedData).Transform(savedData);
using (var fs = File.Create(outputPath))
ML.Data.SaveAsText(savedData, fs, headerRow: true, keepHidden: true);
CheckEquality("Text", "tokenized.tsv");
Done();
}
public static IDataTransform Create(IHostEnvironment env, Arguments args, IDataView input)
{
Contracts.CheckValue(env, nameof(env));
var h = env.Register(RegistrationName);
h.CheckValue(args, nameof(args));
h.CheckValue(input, nameof(input));
h.CheckUserArg(Utils.Size(args.Column) > 0, nameof(args.Column), "Columns must be specified");
// Compose the WordBagTransform from a tokenize transform,
// followed by a NgramExtractionTransform.
// Since WordBagTransform is a many-to-one column transform, for each
// WordBagTransform.Column with multiple sources, we first apply a ConcatTransform.
// REVIEW: In order to not get ngrams that cross between vector slots, we need to
// enable tokenize transforms to insert a special token between slots.
// REVIEW: In order to make it possible to output separate bags for different columns
// using the same dictionary, we need to find a way to make ConcatTransform remember the boundaries.
var tokenizeColumns = new WordTokenizingTransformer.ColumnInfo[args.Column.Length];
var extractorArgs =
new NgramExtractorTransform.Arguments()
{
MaxNumTerms = args.MaxNumTerms,
NgramLength = args.NgramLength,
SkipLength = args.SkipLength,
AllLengths = args.AllLengths,
Weighting = args.Weighting,
Column = new NgramExtractorTransform.Column[args.Column.Length]
};
for (int iinfo = 0; iinfo < args.Column.Length; iinfo++)
{
var column = args.Column[iinfo];
h.CheckUserArg(!string.IsNullOrWhiteSpace(column.Name), nameof(column.Name));
h.CheckUserArg(Utils.Size(column.Source) > 0, nameof(column.Source));
h.CheckUserArg(column.Source.All(src => !string.IsNullOrWhiteSpace(src)), nameof(column.Source));
tokenizeColumns[iinfo] = new WordTokenizingTransformer.ColumnInfo(column.Source.Length > 1 ? column.Name : column.Source[0], column.Name);
extractorArgs.Column[iinfo] =
new NgramExtractorTransform.Column()
{
Name = column.Name,
Source = column.Name,
MaxNumTerms = column.MaxNumTerms,
NgramLength = column.NgramLength,
SkipLength = column.SkipLength,
Weighting = column.Weighting,
AllLengths = column.AllLengths
};
}
IDataView view = input;
view = NgramExtractionUtils.ApplyConcatOnSources(h, args.Column, view);
view = new WordTokenizingEstimator(env, tokenizeColumns).Fit(view).Transform(view);
return NgramExtractorTransform.Create(h, extractorArgs, view);
}
public void WordTokenizeWorkout()
{
var data = new[] { new TestClass()
{
A = "This is a good sentence.", B = new string[2] {
"Much words", "Wow So Cool"
}
} };
var dataView = ML.Data.ReadFromEnumerable(data);
var invalidData = new[] { new TestWrong()
{
A = 1, B = new float[2] {
2, 3
}
} };
var invalidDataView = ML.Data.ReadFromEnumerable(invalidData);
var pipe = new WordTokenizingEstimator(Env, new[] {
new WordTokenizingEstimator.ColumnInfo("TokenizeA", "A"),
new WordTokenizingEstimator.ColumnInfo("TokenizeB", "B"),
});
TestEstimatorCore(pipe, dataView, invalidInput: invalidDataView);
// Reuse the pipe trained on dataView in TestEstimatorCore to make prediction.
var result = pipe.Fit(dataView).Transform(dataView);
// Extract the transformed result of the first row (the only row we have because data contains only one TestClass) as a native class.
var nativeResult = ML.CreateEnumerable <NativeResult>(result, false).First();
// Check the tokenization of A. Expected result is { "This", "is", "a", "good", "sentence." }.
var tokenizeA = new[] { "This", "is", "a", "good", "sentence." };
Assert.True(tokenizeA.Length == nativeResult.TokenizeA.Length);
for (int i = 0; i < tokenizeA.Length; ++i)
{
Assert.Equal(tokenizeA[i], nativeResult.TokenizeA[i]);
}
// Check the tokenization of B. Expected result is { "Much", "words", "Wow", "So", "Cool" }. One may think that the expected output
// should be a 2-D array { { "Much", "words"}, { "Wow", "So", "Cool" } }, but please note that ML.NET may flatten all outputs if
// they are high-dimension tensors.
var tokenizeB = new[] { "Much", "words", "Wow", "So", "Cool" };
Assert.True(tokenizeB.Length == nativeResult.TokenizeB.Length);
for (int i = 0; i < tokenizeB.Length; ++i)
{
Assert.Equal(tokenizeB[i], nativeResult.TokenizeB[i]);
}
Done();
}
public void NgramWorkout()
{
string sentimentDataPath = GetDataPath("wikipedia-detox-250-line-data.tsv");
var data = TextLoader.CreateReader(Env, ctx => (
label: ctx.LoadBool(0),
text: ctx.LoadText(1)), hasHeader: true)
.Read(sentimentDataPath);
var invalidData = TextLoader.CreateReader(Env, ctx => (
label: ctx.LoadBool(0),
text: ctx.LoadFloat(1)), hasHeader: true)
.Read(sentimentDataPath);
var est = new WordTokenizingEstimator(Env, "text", "text")
.Append(new ValueToKeyMappingEstimator(Env, "text", "terms"))
.Append(new NgramEstimator(Env, "terms", "ngrams"))
.Append(new NgramHashEstimator(Env, "terms", "ngramshash"));
// The following call fails because of the following issue
// https://github.com/dotnet/machinelearning/issues/969
// TestEstimatorCore(est, data.AsDynamic, invalidInput: invalidData.AsDynamic);
var outputPath = GetOutputPath("Text", "ngrams.tsv");
using (var ch = Env.Start("save"))
{
var saver = new TextSaver(Env, new TextSaver.Arguments {
Silent = true
});
IDataView savedData = TakeFilter.Create(Env, est.Fit(data.AsDynamic).Transform(data.AsDynamic), 4);
savedData = ColumnSelectingTransformer.CreateKeep(Env, savedData, new[] { "text", "terms", "ngrams", "ngramshash" });
using (var fs = File.Create(outputPath))
DataSaverUtils.SaveDataView(ch, saver, savedData, fs, keepHidden: true);
}
CheckEquality("Text", "ngrams.tsv");
Done();
}
public void TextTokenizationWorkout()
{
string sentimentDataPath = GetDataPath("wikipedia-detox-250-line-data.tsv");
var data = TextLoaderStatic.CreateReader(Env, ctx => (
label: ctx.LoadBool(0),
text: ctx.LoadText(1)), hasHeader: true)
.Read(sentimentDataPath);
var invalidData = TextLoaderStatic.CreateReader(Env, ctx => (
label: ctx.LoadBool(0),
text: ctx.LoadFloat(1)), hasHeader: true)
.Read(sentimentDataPath);
var est = new WordTokenizingEstimator(Env, "text", "words")
.Append(new TokenizingByCharactersEstimator(Env, "text", "chars"))
.Append(new KeyToValueMappingEstimator(Env, "chars"));
TestEstimatorCore(est, data.AsDynamic, invalidInput: invalidData.AsDynamic);
var outputPath = GetOutputPath("Text", "tokenized.tsv");
using (var ch = Env.Start("save"))
{
var saver = new TextSaver(Env, new TextSaver.Arguments {
Silent = true
});
IDataView savedData = TakeFilter.Create(Env, est.Fit(data.AsDynamic).Transform(data.AsDynamic), 4);
savedData = ColumnSelectingTransformer.CreateKeep(Env, savedData, new[] { "text", "words", "chars" });
using (var fs = File.Create(outputPath))
DataSaverUtils.SaveDataView(ch, saver, savedData, fs, keepHidden: true);
}
CheckEquality("Text", "tokenized.tsv");
Done();
}
public void TestOldSavingAndLoading()
{
var data = new[] { new TestClass()
{
A = "This is a good sentence.", B = new string[2] {
"Much words", "Wow So Cool"
}
} };
var dataView = ML.Data.ReadFromEnumerable(data);
var pipe = new WordTokenizingEstimator(Env, new[] {
new WordTokenizingEstimator.ColumnInfo("TokenizeA", "A"),
new WordTokenizingEstimator.ColumnInfo("TokenizeB", "B"),
});
var result = pipe.Fit(dataView).Transform(dataView);
var resultRoles = new RoleMappedData(result);
using (var ms = new MemoryStream())
{
TrainUtils.SaveModel(Env, Env.Start("saving"), ms, null, resultRoles);
ms.Position = 0;
var loadedView = ModelFileUtils.LoadTransforms(Env, dataView, ms);
}
}
public void NgramWorkout()
{
string sentimentDataPath = GetDataPath("wikipedia-detox-250-line-data.tsv");
var data = ML.Data.LoadFromTextFile(sentimentDataPath, new[] {
new TextLoader.Column("label", DataKind.Boolean, 0),
new TextLoader.Column("text", DataKind.String, 1)
},
hasHeader: true, allowQuoting: true);
var invalidData = ML.Data.LoadFromTextFile(sentimentDataPath, new[] {
new TextLoader.Column("label", DataKind.Boolean, 0),
new TextLoader.Column("text", DataKind.Single, 1)
},
hasHeader: true, allowQuoting: true);
var est = new WordTokenizingEstimator(ML, "text", "text")
.Append(new ValueToKeyMappingEstimator(ML, "terms", "text"))
.Append(new NgramExtractingEstimator(ML, "ngrams", "terms"))
.Append(new NgramHashingEstimator(ML, "ngramshash", "terms"))
// Also have a situation where we use invert hashing. However we only write
// the original non-inverted column to the actual baseline file.
.Append(new NgramHashingEstimator(ML, "ngramshashinvert", "terms", maximumNumberOfInverts: 2));
TestEstimatorCore(est, data, invalidInput: invalidData);
var outputPath = GetOutputPath("Text", "ngrams.tsv");
var savedData = ML.Data.TakeRows(est.Fit(data).Transform(data), 4);
savedData = ML.Transforms.SelectColumns("text", "terms", "ngrams", "ngramshash").Fit(savedData).Transform(savedData);
using (var fs = File.Create(outputPath))
ML.Data.SaveAsText(savedData, fs, headerRow: true, keepHidden: true);
CheckEquality("Text", "ngrams.tsv");
Done();
}
public void WordTokenizeWorkout()
{
var data = new[] { new TestClass()
{
A = "This is a good sentence.", B = new string[2] {
"Much words", "Wow So Cool"
}
} };
var dataView = ComponentCreation.CreateDataView(Env, data);
var invalidData = new[] { new TestWrong()
{
A = 1, B = new float[2] {
2, 3
}
} };
var invalidDataView = ComponentCreation.CreateDataView(Env, invalidData);
var pipe = new WordTokenizingEstimator(Env, new[] {
new WordTokenizeTransform.ColumnInfo("A", "TokenizeA"),
new WordTokenizeTransform.ColumnInfo("B", "TokenizeB"),
});
TestEstimatorCore(pipe, dataView, invalidInput: invalidDataView);
Done();
}
internal static ITransformer CreateTransformer(IHostEnvironment env, Options options, IDataView input)
{
Contracts.CheckValue(env, nameof(env));
var h = env.Register(RegistrationName);
h.CheckValue(options, nameof(options));
h.CheckValue(input, nameof(input));
h.CheckUserArg(Utils.Size(options.Columns) > 0, nameof(options.Columns), "Columns must be specified");
// To each input column to the WordHashBagTransform, a tokenize transform is applied,
// followed by applying WordHashVectorizeTransform.
// Since WordHashBagTransform is a many-to-one column transform, for each
// WordHashBagTransform.Column we may need to define multiple tokenize transform columns.
// NgramHashExtractorTransform may need to define an identical number of HashTransform.Columns.
// The intermediate columns are dropped at the end of using a DropColumnsTransform.
IDataView view = input;
var uniqueSourceNames = NgramExtractionUtils.GenerateUniqueSourceNames(h, options.Columns, view.Schema);
Contracts.Assert(uniqueSourceNames.Length == options.Columns.Length);
var tokenizeColumns = new List <WordTokenizingEstimator.ColumnOptions>();
var extractorCols = new NgramHashExtractingTransformer.Column[options.Columns.Length];
var colCount = options.Columns.Length;
List <string> tmpColNames = new List <string>();
for (int iinfo = 0; iinfo < colCount; iinfo++)
{
var column = options.Columns[iinfo];
int srcCount = column.Source.Length;
var curTmpNames = new string[srcCount];
Contracts.Assert(uniqueSourceNames[iinfo].Length == options.Columns[iinfo].Source.Length);
for (int isrc = 0; isrc < srcCount; isrc++)
{
tokenizeColumns.Add(new WordTokenizingEstimator.ColumnOptions(curTmpNames[isrc] = uniqueSourceNames[iinfo][isrc], options.Columns[iinfo].Source[isrc]));
}
tmpColNames.AddRange(curTmpNames);
extractorCols[iinfo] =
new NgramHashExtractingTransformer.Column
{
Name = column.Name,
Source = curTmpNames,
NumberOfBits = column.NumberOfBits,
NgramLength = column.NgramLength,
Seed = column.Seed,
SkipLength = column.SkipLength,
Ordered = column.Ordered,
MaximumNumberOfInverts = column.MaximumNumberOfInverts,
FriendlyNames = options.Columns[iinfo].Source,
UseAllLengths = column.UseAllLengths
};
}
ITransformer t1 = new WordTokenizingEstimator(env, tokenizeColumns.ToArray()).Fit(view);
var featurizeArgs =
new NgramHashExtractingTransformer.Options
{
UseAllLengths = options.UseAllLengths,
NumberOfBits = options.NumberOfBits,
NgramLength = options.NgramLength,
SkipLength = options.SkipLength,
Ordered = options.Ordered,
Seed = options.Seed,
Columns = extractorCols.ToArray(),
MaximumNumberOfInverts = options.MaximumNumberOfInverts
};
view = t1.Transform(view);
ITransformer t2 = NgramHashExtractingTransformer.Create(h, featurizeArgs, view);
// Since we added columns with new names, we need to explicitly drop them before we return the IDataTransform.
ITransformer t3 = new ColumnSelectingTransformer(env, null, tmpColNames.ToArray());
return(new TransformerChain <ITransformer>(new[] { t1, t2, t3 }));
}
public static IDataTransform Create(IHostEnvironment env, Arguments args, IDataView input)
{
Contracts.CheckValue(env, nameof(env));
var h = env.Register(RegistrationName);
h.CheckValue(args, nameof(args));
h.CheckValue(input, nameof(input));
h.CheckUserArg(Utils.Size(args.Column) > 0, nameof(args.Column), "Columns must be specified");
// To each input column to the WordHashBagTransform, a tokenize transform is applied,
// followed by applying WordHashVectorizeTransform.
// Since WordHashBagTransform is a many-to-one column transform, for each
// WordHashBagTransform.Column we may need to define multiple tokenize transform columns.
// NgramHashExtractorTransform may need to define an identical number of HashTransform.Columns.
// The intermediate columns are dropped at the end of using a DropColumnsTransform.
IDataView view = input;
var uniqueSourceNames = NgramExtractionUtils.GenerateUniqueSourceNames(h, args.Column, view.Schema);
Contracts.Assert(uniqueSourceNames.Length == args.Column.Length);
var tokenizeColumns = new List <WordTokenizingTransformer.ColumnInfo>();
var extractorCols = new NgramHashExtractingTransformer.Column[args.Column.Length];
var colCount = args.Column.Length;
List <string> tmpColNames = new List <string>();
for (int iinfo = 0; iinfo < colCount; iinfo++)
{
var column = args.Column[iinfo];
int srcCount = column.Source.Length;
var curTmpNames = new string[srcCount];
Contracts.Assert(uniqueSourceNames[iinfo].Length == args.Column[iinfo].Source.Length);
for (int isrc = 0; isrc < srcCount; isrc++)
{
tokenizeColumns.Add(new WordTokenizingTransformer.ColumnInfo(args.Column[iinfo].Source[isrc], curTmpNames[isrc] = uniqueSourceNames[iinfo][isrc]));
}
tmpColNames.AddRange(curTmpNames);
extractorCols[iinfo] =
new NgramHashExtractingTransformer.Column
{
Name = column.Name,
Source = curTmpNames,
HashBits = column.HashBits,
NgramLength = column.NgramLength,
Seed = column.Seed,
SkipLength = column.SkipLength,
Ordered = column.Ordered,
InvertHash = column.InvertHash,
FriendlyNames = args.Column[iinfo].Source,
AllLengths = column.AllLengths
};
}
view = new WordTokenizingEstimator(env, tokenizeColumns.ToArray()).Fit(view).Transform(view);
var featurizeArgs =
new NgramHashExtractingTransformer.Arguments
{
AllLengths = args.AllLengths,
HashBits = args.HashBits,
NgramLength = args.NgramLength,
SkipLength = args.SkipLength,
Ordered = args.Ordered,
Seed = args.Seed,
Column = extractorCols.ToArray(),
InvertHash = args.InvertHash
};
view = NgramHashExtractingTransformer.Create(h, featurizeArgs, view);
// Since we added columns with new names, we need to explicitly drop them before we return the IDataTransform.
return(ColumnSelectingTransformer.CreateDrop(h, view, tmpColNames.ToArray()));
}
public static void KeyToValueValueToKey()
{
// Create a new ML context, for ML.NET operations. It can be used for exception tracking and logging,
// as well as the source of randomness.
var ml = new MLContext();
// Get a small dataset as an IEnumerable and load it into ML.NET data set.
IEnumerable <SamplesUtils.DatasetUtils.SampleTopicsData> data = SamplesUtils.DatasetUtils.GetTopicsData();
var trainData = ml.Data.ReadFromEnumerable(data);
// Preview of one of the columns of the the topics data.
// The Review column contains the keys associated with a particular body of text.
//
// Review
// "animals birds cats dogs fish horse"
// "horse birds house fish duck cats"
// "car truck driver bus pickup"
// "car truck driver bus pickup horse"
// A pipeline to convert the terms of the 'Review' column in
// making use of default settings.
string defaultColumnName = "DefaultKeys";
// REVIEW create through the catalog extension
var default_pipeline = new WordTokenizingEstimator(ml, "Review")
.Append(ml.Transforms.Conversion.MapValueToKey(defaultColumnName, "Review"));
// Another pipeline, that customizes the advanced settings of the ValueToKeyMappingEstimator.
// We can change the maxNumTerm to limit how many keys will get generated out of the set of words,
// and condition the order in which they get evaluated by changing sort from the default Occurence (order in which they get encountered)
// to value/alphabetically.
string customizedColumnName = "CustomizedKeys";
var customized_pipeline = new WordTokenizingEstimator(ml, "Review")
.Append(ml.Transforms.Conversion.MapValueToKey(customizedColumnName, "Review", maxNumKeys: 10, sort: ValueToKeyMappingEstimator.SortOrder.Value));
// The transformed data.
var transformedData_default = default_pipeline.Fit(trainData).Transform(trainData);
var transformedData_customized = customized_pipeline.Fit(trainData).Transform(trainData);
// Small helper to print the text inside the columns, in the console.
Action <string, IEnumerable <VBuffer <uint> > > printHelper = (columnName, column) =>
{
Console.WriteLine($"{columnName} column obtained post-transformation.");
foreach (var row in column)
{
foreach (var value in row.GetValues())
{
Console.Write($"{value} ");
}
Console.WriteLine("");
}
Console.WriteLine("===================================================");
};
// Preview of the DefaultKeys column obtained after processing the input.
var defaultColumn = transformedData_default.GetColumn <VBuffer <uint> >(ml, defaultColumnName);
printHelper(defaultColumnName, defaultColumn);
// DefaultKeys column obtained post-transformation.
//
// 1 2 3 4 5 6
// 6 2 7 5 8 3
// 9 10 11 12 13 3
// 9 10 11 12 13 6
// Previewing the CustomizedKeys column obtained after processing the input.
var customizedColumn = transformedData_customized.GetColumn <VBuffer <uint> >(ml, customizedColumnName);
printHelper(customizedColumnName, customizedColumn);
// CustomizedKeys column obtained post-transformation.
//
// 1 2 4 5 7 8
// 8 2 9 7 6 4
// 3 10 0 0 0 4
// 3 10 0 0 0 8
// Retrieve the original values, by appending the KeyToValue etimator to the existing pipelines
// to convert the keys back to the strings.
var pipeline = default_pipeline.Append(ml.Transforms.Conversion.MapKeyToValue(defaultColumnName));
transformedData_default = pipeline.Fit(trainData).Transform(trainData);
// Preview of the DefaultColumnName column obtained.
var originalColumnBack = transformedData_default.GetColumn <VBuffer <ReadOnlyMemory <char> > >(ml, defaultColumnName);
foreach (var row in originalColumnBack)
{
foreach (var value in row.GetValues())
{
Console.Write($"{value} ");
}
Console.WriteLine("");
}
// DefaultKeys column obtained post-transformation.
//
// animals birds cats dogs fish horse
// horse birds house fish duck cats
// car truck driver bus pickup cats
// car truck driver bus pickup horse
}