Replace DropColumns,KeepColumns and ChooseColumns with SelectColumns #1269

singlis · 2018-10-15T22:54:44Z

This adds the SelectColumns Transform and Estimator that is replacing
the DropColumns and ChooseColumns Transforms. With this check-in, Drop
and Choose are still in the code base but will be removed. In order to
support loading older models, SelectColumns supports loading in Drop and
Choose transforms. The changes include:

Implementation of the SelectColumnsTransform,
SelectColumnsDataTransform and SelectColumnsEstimator
Backward compatibility with Drop and Choose columns by providing
functions on SelectColumns that will be called when loading the model.
Entry point apis for calling select from the command line.
Additional tests.

These changes are related to #754.

This adds the SelectColumns Transform and Estimator that is replacing the DropColumns and ChooseColumns Transforms. With this check-in, Drop and Choose are still in the code base but will be removed. In order to support loading older models, SelectColumns supports loading in Drop and Choose transforms. The changes include: - Implementation of the SelectColumnsTransform, SelectColumnsDataTransform and SelectColumnsEstimator - Backward compatibility with Drop and Choose columns by providing functions on SelectColumns that will be called when loading the model. - Entry point apis for calling select from the command line. - Additional tests. These changes are related to dotnet#754.

singlis · 2018-10-15T22:56:54Z

src/Microsoft.ML.Core/Data/Schema.cs

@@ -0,0 +1,217 @@
+// Licensed to the .NET Foundation under one or more agreements.


Note: This file will be coming in via this PR:
1167 #Resolved

singlis · 2018-10-15T22:59:25Z

test/Microsoft.ML.Tests/CSharpCodeGen.cs

@@ -15,7 +15,8 @@ public CSharpCodeGen(ITestOutputHelper output) : base(output)
        {
        }

-        [Fact(Skip = "Execute this test if you want to regenerate CSharpApi file")]
+        //[Fact(Skip = "Execute this test if you want to regenerate CSharpApi file")]


I will revert this change. #Resolved

Ivanidzo4ka · 2018-10-15T23:11:58Z

src/Microsoft.ML.Data/Transforms/SelectColumnsTransform.cs

+        {
+            private readonly Mapper _mapper;
+            private readonly IRow _input;
+            public Row(IRow input, Mapper mapper, Schema outputSchema)


Schema outputSchema [](start = 50, length = 19)

Looks weird #Closed

Removed the outputSchema

In reply to: 225345828 [](ancestors = 225345828)

Ivanidzo4ka · 2018-10-15T23:12:37Z

src/Microsoft.ML.Data/Transforms/SelectColumnsTransform.cs

+                => _input.GetIdGetter();
+
+            public bool IsColumnActive(int col)
+            {


{ [](start = 12, length = 1)

why not => true? #Closed

Ivanidzo4ka · 2018-10-15T23:13:25Z

src/Microsoft.ML.Data/Transforms/SelectColumnsTransform.cs

+            {
+                disposer = null;
+                using (var ch = _host.Start("GetEntireRow"))
+                {


any reason to create it? I don't see any usage of it. #Closed

no - I have removed it.

In reply to: 225346084 [](ancestors = 225346084)

Ivanidzo4ka · 2018-10-15T23:13:50Z

src/Microsoft.ML.Data/Transforms/SelectColumnsTransform.cs

+
+            public ValueGetter<TValue> GetGetter<TValue>(int col)
+
+            {


extra line #Closed

Ivanidzo4ka · 2018-10-15T23:14:07Z

src/Microsoft.ML.Data/Transforms/SelectColumnsTransform.cs

+            }
+
+            public bool IsColumnActive(int col)
+            {


{ [](start = 12, length = 1)

feel free to use => notion for one liners. #Closed

Ivanidzo4ka · 2018-10-15T23:14:37Z

src/Microsoft.ML.Data/Transforms/SelectColumnsTransform.cs

+                for (int colIdx = 0; colIdx < columnCount; ++colIdx)
+                {
+                    if (activeOutput(colIdx))
+                    {


{ [](start = 20, length = 1)

we tend to omit braces for one liners. #Closed

Ivanidzo4ka · 2018-10-15T23:14:56Z

src/Microsoft.ML.Data/Transforms/SelectColumnsTransform.cs

+
+            public IRowCursor GetRowCursor(Func<int, bool> needCol, IRandom rand = null)
+            {
+                _host.AssertValue(needCol, "needCol");


needCol" [](start = 44, length = 8)

nameof #Closed

Ivanidzo4ka · 2018-10-15T23:15:14Z

src/Microsoft.ML.Data/Transforms/SelectColumnsTransform.cs

+            }
+
+            public void Save(ModelSaveContext ctx)
+            {


{ [](start = 12, length = 1)

=> #Closed

Ivanidzo4ka · 2018-10-15T23:15:26Z

src/Microsoft.ML.Data/Transforms/SelectColumnsTransform.cs

+            public ISchema InputSchema => Source.Schema;
+
+            public long? GetRowCount(bool lazy = true)
+            {


{ [](start = 12, length = 1)

=> #Closed

Ivanidzo4ka · 2018-10-15T23:15:49Z

src/Microsoft.ML.Data/Transforms/SelectColumnsTransform.cs

+        private sealed class SelectColumnsDataTransform : IDataTransform, IRowToRowMapper
+        {
+            private readonly Mapper _mapper;
+            private readonly IHostEnvironment _host;


_host [](start = 46, length = 5)

i would call it _env if it's IHostEnvironment. #Closed

Updated the file as well.

In reply to: 225346508 [](ancestors = 225346508)

Ivanidzo4ka · 2018-10-15T23:16:42Z

src/Microsoft.ML.Data/Transforms/SelectColumnsTransform.cs

+                _transform = transform;
+                _mapper = mapper;
+                Source = input;
+                _host = host;


_host = host [](start = 16, length = 12)

accept env object and make _host is IHost, and do _host = env.Register(nameof(SelectColumnsDataTransform)); #Pending

I probably gave two contradictive comments.
Can you call it IHost _host?

In reply to: 225346656 [](ancestors = 225346656)

Ivanidzo4ka · 2018-10-15T23:16:50Z

src/Microsoft.ML.Data/Transforms/SelectColumnsTransform.cs

+                => _input.GetIdGetter();
+
+            public bool IsColumnActive(int col)
+            {


{ [](start = 12, length = 1)

=> #Closed

Ivanidzo4ka · 2018-10-15T23:22:00Z

src/Microsoft.ML.Data/Transforms/SelectColumnsTransform.cs

+            private readonly Mapper _mapper;
+            private readonly IHostEnvironment _host;
+            private readonly SelectColumnsTransform _transform;
+            public SelectColumnsDataTransform(IHostEnvironment host, SelectColumnsTransform transform, Mapper mapper, IDataView input)


add new line #Closed

src/Microsoft.ML.Data/Transforms/SelectColumnsTransform.cs

Ivanidzo4ka · 2018-10-15T23:25:30Z

src/Microsoft.ML.Data/Transforms/SelectColumnsTransform.cs

+        /// <summary>
+        /// Constructs the Select Columns Estimator with an array of column names to keep.
+        /// </summary>
+        /// <param name="env">Instance of the host environment</param>


"." in the end of sentence #Closed

Ivanidzo4ka · 2018-10-15T23:25:52Z

src/Microsoft.ML.Data/Transforms/SelectColumnsTransform.cs

+        /// Constructs the Select Columns Estimator with an array of column names to keep.
+        /// </summary>
+        /// <param name="env">Instance of the host environment</param>
+        /// <param name="columns">The array of column names to keep</param>


keep [](start = 63, length = 4)

"." in the end of sentence, everywhere please #Closed

Zruty0 · 2018-10-16T03:28:05Z

test/Microsoft.ML.Core.Tests/UnitTests/TestEntryPoints.cs

@@ -242,7 +242,8 @@ private string GetBuildPrefix()
 #endif
        }

-        [Fact(Skip = "Execute this test if you want to regenerate ep-list and _manifest.json")]
+        //[Fact(Skip = "Execute this test if you want to regenerate ep-list and _manifest.json")]
+        [Fact]


Fact [](start = 9, length = 4)

don't forget to undo #Closed

please revert it to skip

In reply to: 225386340 [](ancestors = 225386340)

Zruty0 · 2018-10-16T03:28:21Z

using Microsoft.ML.Runtime.Api;

Copyright header #Closed

Refers to: test/Microsoft.ML.Tests/SelectColumnsTransformsTests.cs:1 in 1b0fff9. [](commit_id = 1b0fff9, deletion_comment = False)

Zruty0 · 2018-10-16T03:29:53Z

test/Microsoft.ML.Tests/SelectColumnsTransformsTests.cs

+
+namespace Microsoft.ML.Tests
+{
+    public class SelectColumnsTransformsTests : BaseTestClass


BaseTestClass [](start = 48, length = 13)

Please add a test that calls TestEstimatorCore #Closed

Or add that to one of the existing tests.

In reply to: 225386549 [](ancestors = 225386549)

src/Microsoft.ML.Data/Transforms/SelectColumnsTransform.cs

Zruty0 · 2018-10-16T03:36:29Z

src/Microsoft.ML.Data/Transforms/SelectColumnsTransform.cs

+
+namespace Microsoft.ML.Transforms
+{
+    /// <summary>


summary [](start = 9, length = 7)

Please re-word this comment. It should not mention that this is an estimator class, and the 2nd sentence looked off. Maybe the clarification about 'it may or may not keep hidden columns' don't really belong to the summary comment #Closed

Zruty0 · 2018-10-16T03:38:10Z

src/Microsoft.ML.Data/Transforms/SelectColumnsTransform.cs

+
+        public SchemaShape GetOutputSchema(SchemaShape inputSchema)
+        {
+            var columns = new List<SchemaShape.Column>();


how about

var columns = inputSchema.Columns.Where(c=>_selectPredicate(c.Name)) return new SchemaShape(columns) ``` #Closed

So I really want an IEnumerable for Columns, but all I have is ColumnCount and GetColumnName(idx). Maybe this is coming in the near future? Oh wait -- I just saw that your PR went though. I will update...

In reply to: 225387439 [](ancestors = 225387439)

Ok thank you - I have updated.

In reply to: 225682139 [](ancestors = 225682139,225387439)

Zruty0 · 2018-10-16T03:39:58Z

src/Microsoft.ML.Data/Transforms/SelectColumnsTransform.cs

+            _selectedColumns = columns;
+        }
+
+        /// Helper function to determine the model version that is being loaded


/// [](start = 8, length = 3)

either // or make a full summary comment #Closed

Zruty0 · 2018-10-16T03:41:01Z

src/Microsoft.ML.Data/Transforms/SelectColumnsTransform.cs

+            var length = _selectedColumns.Length;
+            ctx.Writer.Write(length);
+            for (int i = 0; i < length; i++)
+            {


{ [](start = 12, length = 1)

no curlies for 1-line bodies #Closed

Zruty0 · 2018-10-16T03:43:15Z

src/Microsoft.ML.Data/Transforms/SelectColumnsTransform.cs

+                }
+            }
+
+            internal Mapper(SelectColumnsTransform transform, ISchema inputSchema)


internal [](start = 12, length = 8)

public is fine, since it's private class #Closed

Zruty0 · 2018-10-16T03:44:50Z

src/Microsoft.ML.Data/Transforms/SelectColumnsTransform.cs

+
+            public ISchema Schema => _outputSchema;
+
+            public int this [int colIndex]


this [](start = 23, length = 4)

I'm not sure I approve of the use of indexer in this manner. Let's just make a public method #Closed

…to singlis/drop

singlis · 2018-10-16T21:37:17Z

Thanks Artidoro - this is a good point. I am following up to see if it even makes sense for SelectColumns to have pigsty extensions. If so, I will create an issue and followup on a different PR.

In reply to: 430325275 [](ancestors = 430325275)

Ivanidzo4ka · 2018-10-17T18:27:40Z

src/Microsoft.ML.Data/Transforms/SelectColumnsTransform.cs

+            _host.CheckValue(inputSchema, nameof(inputSchema));
+            return new SelectColumnsDataTransform(_host, this,
+                                                  new Mapper(this, inputSchema),
+                                                  new EmptyDataView(_host, Schema.Create(inputSchema)));


Schema.Create(inputSchema) [](start = 75, length = 26)

This looks excessive. #Closed

actually if you look at Schema.Create, you'll see that it will just return inputSchema, so let's not call the method at all

In reply to: 226045960 [](ancestors = 226045960)

Ivanidzo4ka

Zruty0 · 2018-10-17T18:40:06Z

src/Microsoft.ML.Data/Transforms/SelectColumnsTransform.cs

+        /// <param name="env">Instance of the host environment.</param>
+        /// <param name="keepHidden">Specifies if hidden columns should be removed. Default is true to keep hidden columns.</param>
+        /// <param name="selectPredicate">The predicate that will determines the columns to keep.</param>
+        public SelectColumnsEstimator(IHostEnvironment env, bool keepHidden, Func<string, bool> selectPredicate)


SelectColumnsEstimator [](start = 15, length = 22)

why not bundle with the above, and default keepHidden to true? #Closed

Zruty0 · 2018-10-17T18:40:19Z

src/Microsoft.ML.Data/Transforms/SelectColumnsTransform.cs

+        /// Constructs the Select Columns Estimator using a specified predicate to determine the columns to keep.
+        /// </summary>
+        /// <param name="env">Instance of the host environment.</param>
+        /// <param name="keepHidden">Specifies if hidden columns should be removed. Default is true to keep hidden columns.</param>


Default is true to keep hidden columns. [](start = 84, length = 39)

remove #Closed

Zruty0 · 2018-10-17T19:39:09Z

test/Microsoft.ML.Tests/SelectColumnsTransformsTests.cs

+            {
+                var dataView = ComponentCreation.CreateDataView(env, data);
+                var est = new SelectColumnsEstimator(env, new[]{ "D", "E" });
+                TestEstimatorCore(est, validFitInput: dataView);


TestEstimatorCore [](start = 16, length = 17)

actually, let's make it more elaborate, and

test the predicate version here (for instance, keep only columns with >1 characters in name)

add an invalid dataset #Closed

since the api change, I have TestEstimatorCore for both keep and drop scenarios both with invalid data sets.

In reply to: 226068148 [](ancestors = 226068148)

Zruty0

…to singlis/drop

Zruty0 · 2018-10-19T19:44:12Z

src/Microsoft.ML.Data/Transforms/SelectColumnsTransform.cs

+        /// Constructs the Select Columns Estimator.
+        /// </summary>
+        /// <param name="env">Instance of the host environment.</param>
+        /// <param name="keepColumns">The array of column names to keep, cannot be set with dropColumns.</param>


dropColumns [](start = 92, length = 11)

<paramref> #Resolved

Zruty0 · 2018-10-19T19:44:27Z

src/Microsoft.ML.Data/Transforms/SelectColumnsTransform.cs

+        /// <param name="env">Instance of the host environment.</param>
+        /// <param name="keepColumns">The array of column names to keep, cannot be set with dropColumns.</param>
+        /// <param name="dropColumns">The array of column names to drop, cannot be set with keepColumns.</param>
+        /// <param name="keepHidden">Boolean if true will keep hidden columns and false will remove hidden columns.</param>


Boolean [](start = 37, length = 7)

no need to specify the type #Resolved

Zruty0 · 2018-10-19T19:44:50Z

src/Microsoft.ML.Data/Transforms/SelectColumnsTransform.cs

+        /// <param name="keepColumns">The array of column names to keep, cannot be set with dropColumns.</param>
+        /// <param name="dropColumns">The array of column names to drop, cannot be set with keepColumns.</param>
+        /// <param name="keepHidden">Boolean if true will keep hidden columns and false will remove hidden columns.</param>
+        /// <param name="ignoreMismatch">Boolean if false will check for any mismatch between what is specified in keepColumns or dropColumns


ignoreMismatch [](start = 25, length = 14)

'mismatch' is too broad. 'Missing' is probably better #Resolved

Zruty0 · 2018-10-19T19:45:26Z

src/Microsoft.ML.Data/Transforms/SelectColumnsTransform.cs

+        }
+
+        /// <summary>
+        /// Static helper function to create a SelectColumnsEstimator with columns to drop.


tatic helper function to create a SelectColumnsEstimator with columns to drop. [](start = 13, length = 78)

Please write a user-facing summary comment, not developer-facing #Resolved

Zruty0 · 2018-10-19T19:51:42Z

src/Microsoft.ML.Data/Transforms/SelectColumnsTransform.cs

+                !IsSchemaValid(inputSchema.GetColumns().Select(x=>x.column.Name),
+                                SelectColumns,
+                                out IEnumerable<string> invalidColumns))
+                  throw _host.ExceptSchemaMismatch(nameof(inputSchema), "input",


throw [](start = 18, length = 5)

for such complicated statement above, it's appropriate to use curlies #Resolved

Zruty0 · 2018-10-19T19:52:09Z

src/Microsoft.ML.Data/Transforms/SelectColumnsTransform.cs

+            }
+
+            private static int[] BuildOutputToInputMap(IEnumerable<string> selectedColumns,
+                                                         bool keepColumns,


bool [](start = 57, length = 4)

this is a non-standard padding. Standard is 4 spaces to the right of 'private' #Resolved

I moved this over, but does this apply to function calls as well? I usually try to keep the parameters together for readability.

In reply to: 226763760 [](ancestors = 226763760)

Zruty0

Zruty0

Ivanidzo4ka

singlis commented Oct 15, 2018

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artidoro self-requested a review October 16, 2018 17:09

Merge branch 'master' of https://github.com/dotnet/machinelearning in…

683ad91

…to singlis/drop

singlis added 4 commits October 16, 2018 14:45

- Updating based upon review feedback.

49d41da

-Reverting change for GenerateCSharpAPI test.

4e4082a

- Updating the base line output for release

f35e60d

-Re-updating expected schemas.

f65590a

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singlis added 4 commits October 17, 2018 15:36

Merge branch 'master' of https://github.com/dotnet/machinelearning in…

f998269

…to singlis/drop

-Updating api to support drop operations, updated unit tests

81d658b

Merge branch 'master' of https://github.com/dotnet/machinelearning in…

6033d6d

…to singlis/drop

- Regenerating apis.

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- Update from feedback

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- Renaming an IHostEnvironment to IHost

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singlis merged commit 9a33cd4 into dotnet:master Oct 20, 2018

singlis deleted the singlis/drop branch March 7, 2019 00:54

ghost locked as resolved and limited conversation to collaborators Mar 27, 2022

		@@ -0,0 +1,217 @@
		// Licensed to the .NET Foundation under one or more agreements.


		public ISchema Schema => _outputSchema;

		public int this [int colIndex]

Replace DropColumns,KeepColumns and ChooseColumns with SelectColumns #1269

Replace DropColumns,KeepColumns and ChooseColumns with SelectColumns #1269

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