public ITransformer Fit(IDataView input)
{
var h = _host;
h.CheckValue(input, nameof(input));
var tparams = new TransformApplierParams(this);
string[] textCols = _inputColumns;
string[] wordTokCols = null;
string[] charTokCols = null;
string wordFeatureCol = null;
string charFeatureCol = null;
List <string> tempCols = new List <string>();
IDataView view = input;
if (tparams.NeedInitialSourceColumnConcatTransform && textCols.Length > 1)
{
var srcCols = textCols;
textCols = new[] { GenerateColumnName(input.Schema, OutputColumn, "InitialConcat") };
tempCols.Add(textCols[0]);
view = new ConcatTransform(h, textCols[0], srcCols).Transform(view);
}
if (tparams.NeedsNormalizeTransform)
{
var xfCols = new (string input, string output)[textCols.Length];
public ITransformer Fit(IDataView input)
{
_host.CheckValue(input, nameof(input));
var xf = new ConcatTransform(_host, input, _name, _source);
var empty = new EmptyDataView(_host, input.Schema);
var chunk = ApplyTransformUtils.ApplyAllTransformsToData(_host, xf, empty, input);
return(new ConcatTransformer(_host, chunk));
}
public static IDataView ApplyConcatOnSources(IHostEnvironment env, ManyToOneColumn[] columns, IDataView input)
{
Contracts.CheckValue(env, nameof(env));
env.CheckValue(columns, nameof(columns));
env.CheckValue(input, nameof(input));
IDataView view = input;
var concatCols = new List <ConcatTransform.Column>();
foreach (var col in columns)
{
env.CheckUserArg(col != null, nameof(WordBagTransform.Arguments.Column));
env.CheckUserArg(!string.IsNullOrWhiteSpace(col.Name), nameof(col.Name));
env.CheckUserArg(Utils.Size(col.Source) > 0, nameof(col.Source));
env.CheckUserArg(col.Source.All(src => !string.IsNullOrWhiteSpace(src)), nameof(col.Source));
if (col.Source.Length > 1)
{
concatCols.Add(
new ConcatTransform.Column
{
Source = col.Source,
Name = col.Name
});
}
}
if (concatCols.Count > 0)
{
var concatArgs = new ConcatTransform.Arguments {
Column = concatCols.ToArray()
};
return(ConcatTransform.Create(env, concatArgs, view));
}
return(view);
}
public ITransformer Fit(IDataView input)
{
var h = _host;
h.CheckValue(input, nameof(input));
var tparams = new TransformApplierParams(this);
string[] textCols = _inputColumns;
string[] wordTokCols = null;
string[] charTokCols = null;
string wordFeatureCol = null;
string charFeatureCol = null;
List <string> tempCols = new List <string>();
IDataView view = input;
if (tparams.NeedInitialSourceColumnConcatTransform && textCols.Length > 1)
{
var srcCols = textCols;
textCols = new[] { GenerateColumnName(input.Schema, OutputColumn, "InitialConcat") };
tempCols.Add(textCols[0]);
view = new ConcatTransform(h, textCols[0], srcCols).Transform(view);
}
if (tparams.NeedsNormalizeTransform)
{
var xfCols = new TextNormalizerCol[textCols.Length];
string[] dstCols = new string[textCols.Length];
for (int i = 0; i < textCols.Length; i++)
{
dstCols[i] = GenerateColumnName(view.Schema, textCols[i], "TextNormalizer");
tempCols.Add(dstCols[i]);
xfCols[i] = new TextNormalizerCol()
{
Source = textCols[i], Name = dstCols[i]
};
}
view = new TextNormalizerTransform(h,
new TextNormalizerArgs()
{
Column = xfCols,
KeepDiacritics = tparams.KeepDiacritics,
KeepNumbers = tparams.KeepNumbers,
KeepPunctuations = tparams.KeepPunctuations,
TextCase = tparams.TextCase
}, view);
textCols = dstCols;
}
if (tparams.NeedsWordTokenizationTransform)
{
var xfCols = new DelimitedTokenizeTransform.Column[textCols.Length];
wordTokCols = new string[textCols.Length];
for (int i = 0; i < textCols.Length; i++)
{
var col = new DelimitedTokenizeTransform.Column();
col.Source = textCols[i];
col.Name = GenerateColumnName(view.Schema, textCols[i], "WordTokenizer");
xfCols[i] = col;
wordTokCols[i] = col.Name;
tempCols.Add(col.Name);
}
view = new DelimitedTokenizeTransform(h, new DelimitedTokenizeTransform.Arguments()
{
Column = xfCols
}, view);
}
if (tparams.NeedsRemoveStopwordsTransform)
{
Contracts.Assert(wordTokCols != null, "StopWords transform requires that word tokenization has been applied to the input text.");
var xfCols = new StopWordsCol[wordTokCols.Length];
var dstCols = new string[wordTokCols.Length];
for (int i = 0; i < wordTokCols.Length; i++)
{
var col = new StopWordsCol();
col.Source = wordTokCols[i];
col.Name = GenerateColumnName(view.Schema, wordTokCols[i], "StopWordsRemoverTransform");
dstCols[i] = col.Name;
tempCols.Add(col.Name);
col.Language = tparams.StopwordsLanguage;
xfCols[i] = col;
}
view = tparams.StopWordsRemover.CreateComponent(h, view, xfCols);
wordTokCols = dstCols;
}
if (tparams.WordExtractorFactory != null)
{
var dstCol = GenerateColumnName(view.Schema, OutputColumn, "WordExtractor");
tempCols.Add(dstCol);
view = tparams.WordExtractorFactory.Create(h, view, new[] {
new ExtractorColumn()
{
Name = dstCol,
Source = wordTokCols,
FriendlyNames = _inputColumns
}
});
wordFeatureCol = dstCol;
}
if (tparams.OutputTextTokens)
{
string[] srcCols = wordTokCols ?? textCols;
view = new ConcatTransform(h, string.Format(TransformedTextColFormat, OutputColumn), srcCols).Transform(view);
}
if (tparams.CharExtractorFactory != null)
{
{
var srcCols = tparams.NeedsRemoveStopwordsTransform ? wordTokCols : textCols;
charTokCols = new string[srcCols.Length];
var xfCols = new CharTokenizeTransform.Column[srcCols.Length];
for (int i = 0; i < srcCols.Length; i++)
{
var col = new CharTokenizeTransform.Column();
col.Source = srcCols[i];
col.Name = GenerateColumnName(view.Schema, srcCols[i], "CharTokenizer");
tempCols.Add(col.Name);
charTokCols[i] = col.Name;
xfCols[i] = col;
}
view = new CharTokenizeTransform(h, new CharTokenizeTransform.Arguments()
{
Column = xfCols
}, view);
}
{
charFeatureCol = GenerateColumnName(view.Schema, OutputColumn, "CharExtractor");
tempCols.Add(charFeatureCol);
view = tparams.CharExtractorFactory.Create(h, view, new[] {
new ExtractorColumn()
{
Source = charTokCols,
FriendlyNames = _inputColumns,
Name = charFeatureCol
}
});
}
}
if (tparams.VectorNormalizer != TextNormKind.None)
{
var xfCols = new List <LpNormNormalizerTransform.Column>(2);
if (charFeatureCol != null)
{
var dstCol = GenerateColumnName(view.Schema, charFeatureCol, "LpCharNorm");
tempCols.Add(dstCol);
xfCols.Add(new LpNormNormalizerTransform.Column()
{
Source = charFeatureCol,
Name = dstCol
});
charFeatureCol = dstCol;
}
if (wordFeatureCol != null)
{
var dstCol = GenerateColumnName(view.Schema, wordFeatureCol, "LpWordNorm");
tempCols.Add(dstCol);
xfCols.Add(new LpNormNormalizerTransform.Column()
{
Source = wordFeatureCol,
Name = dstCol
});
wordFeatureCol = dstCol;
}
if (xfCols.Count > 0)
{
view = new LpNormNormalizerTransform(h, new LpNormNormalizerTransform.Arguments()
{
NormKind = tparams.LpNormalizerKind,
Column = xfCols.ToArray()
}, view);
}
}
{
var srcTaggedCols = new List <KeyValuePair <string, string> >(2);
if (charFeatureCol != null && wordFeatureCol != null)
{
// If we're producing both char and word grams, then we need to disambiguate
// between them (e.g. the word 'a' vs. the char gram 'a').
srcTaggedCols.Add(new KeyValuePair <string, string>("Char", charFeatureCol));
srcTaggedCols.Add(new KeyValuePair <string, string>("Word", wordFeatureCol));
}
else
{
// Otherwise, simply use the slot names, omitting the original source column names
// entirely. For the Concat transform setting the Key == Value of the TaggedColumn
// KVP signals this intent.
Contracts.Assert(charFeatureCol != null || wordFeatureCol != null || tparams.OutputTextTokens);
if (charFeatureCol != null)
{
srcTaggedCols.Add(new KeyValuePair <string, string>(charFeatureCol, charFeatureCol));
}
else if (wordFeatureCol != null)
{
srcTaggedCols.Add(new KeyValuePair <string, string>(wordFeatureCol, wordFeatureCol));
}
}
if (srcTaggedCols.Count > 0)
{
view = new ConcatTransform(h, new ConcatTransform.ColumnInfo(OutputColumn,
srcTaggedCols.Select(kvp => (kvp.Value, kvp.Key))))
.Transform(view);
}
}
view = new DropColumnsTransform(h,
new DropColumnsTransform.Arguments()
{
Column = tempCols.ToArray()
}, view);
return(new Transformer(_host, input, view));
}
public static IDataTransform Create(IHostEnvironment env, Arguments args, IDataView input)
{
Contracts.CheckValue(env, nameof(env));
var h = env.Register("Categorical");
h.CheckValue(args, nameof(args));
h.CheckValue(input, nameof(input));
h.CheckUserArg(Utils.Size(args.Column) > 0, nameof(args.Column));
var replaceCols = new List <NAReplaceTransform.ColumnInfo>();
var naIndicatorCols = new List <NAIndicatorTransform.Column>();
var naConvCols = new List <ConvertTransform.Column>();
var concatCols = new List <ConcatTransform.TaggedColumn>();
var dropCols = new List <string>();
var tmpIsMissingColNames = input.Schema.GetTempColumnNames(args.Column.Length, "IsMissing");
var tmpReplaceColNames = input.Schema.GetTempColumnNames(args.Column.Length, "Replace");
for (int i = 0; i < args.Column.Length; i++)
{
var column = args.Column[i];
var addInd = column.ConcatIndicator ?? args.Concat;
if (!addInd)
{
replaceCols.Add(new NAReplaceTransform.ColumnInfo(column.Source, column.Name, (NAReplaceTransform.ColumnInfo.ReplacementMode)(column.Kind ?? args.ReplaceWith), column.ImputeBySlot ?? args.ImputeBySlot));
continue;
}
// Check that the indicator column has a type that can be converted to the NAReplaceTransform output type,
// so that they can be concatenated.
if (!input.Schema.TryGetColumnIndex(column.Source, out int inputCol))
{
throw h.Except("Column '{0}' does not exist", column.Source);
}
var replaceType = input.Schema.GetColumnType(inputCol);
if (!Conversions.Instance.TryGetStandardConversion(BoolType.Instance, replaceType.ItemType, out Delegate conv, out bool identity))
{
throw h.Except("Cannot concatenate indicator column of type '{0}' to input column of type '{1}'",
BoolType.Instance, replaceType.ItemType);
}
// Find a temporary name for the NAReplaceTransform and NAIndicatorTransform output columns.
var tmpIsMissingColName = tmpIsMissingColNames[i];
var tmpReplacementColName = tmpReplaceColNames[i];
// Add an NAHandleTransform column.
naIndicatorCols.Add(new NAIndicatorTransform.Column()
{
Name = tmpIsMissingColName, Source = column.Source
});
// Add a ConvertTransform column if necessary.
if (!identity)
{
naConvCols.Add(new ConvertTransform.Column()
{
Name = tmpIsMissingColName, Source = tmpIsMissingColName, ResultType = replaceType.ItemType.RawKind
});
}
// Add the NAReplaceTransform column.
replaceCols.Add(new NAReplaceTransform.ColumnInfo(column.Source, tmpReplacementColName, (NAReplaceTransform.ColumnInfo.ReplacementMode)(column.Kind ?? args.ReplaceWith), column.ImputeBySlot ?? args.ImputeBySlot));
// Add the ConcatTransform column.
if (replaceType.IsVector)
{
concatCols.Add(new ConcatTransform.TaggedColumn()
{
Name = column.Name,
Source = new[] {
new KeyValuePair <string, string>(tmpReplacementColName, tmpReplacementColName),
new KeyValuePair <string, string>("IsMissing", tmpIsMissingColName)
}
});
}
else
{
concatCols.Add(new ConcatTransform.TaggedColumn()
{
Name = column.Name,
Source = new[]
{
new KeyValuePair <string, string>(column.Source, tmpReplacementColName),
new KeyValuePair <string, string>(string.Format("IsMissing.{0}", column.Source), tmpIsMissingColName),
}
});
}
// Add the temp column to the list of columns to drop at the end.
dropCols.Add(tmpIsMissingColName);
dropCols.Add(tmpReplacementColName);
}
IDataTransform output = null;
// Create the indicator columns.
if (naIndicatorCols.Count > 0)
{
output = NAIndicatorTransform.Create(h, new NAIndicatorTransform.Arguments()
{
Column = naIndicatorCols.ToArray()
}, input);
}
// Convert the indicator columns to the correct type so that they can be concatenated to the NAReplace outputs.
if (naConvCols.Count > 0)
{
h.AssertValue(output);
output = new ConvertTransform(h, new ConvertTransform.Arguments()
{
Column = naConvCols.ToArray()
}, output);
}
// Create the NAReplace transform.
output = NAReplaceTransform.Create(env, output ?? input, replaceCols.ToArray());
// Concat the NAReplaceTransform output and the NAIndicatorTransform output.
if (naIndicatorCols.Count > 0)
{
output = ConcatTransform.Create(h, new ConcatTransform.TaggedArguments()
{
Column = concatCols.ToArray()
}, output);
}
// Finally, drop the temporary indicator columns.
if (dropCols.Count > 0)
{
output = new DropColumnsTransform(h, new DropColumnsTransform.Arguments()
{
Column = dropCols.ToArray()
}, output);
}
return(output);
}
