VectorToImageTransform conversion to estimator/transformer (#2580)

* Convert VectorToImageTransform to estimator/transformer

* Rename Schema, Row, etc.

* Code review comments, and fix baseline of EntryPointCatalog test

* Code review comments

* Fix EntryPointCatalog baseline

Author: yaeldMS

src/Microsoft.ML.ImageAnalytics/EntryPoints/ImageAnalytics.cs

@@ -63,12 +63,12 @@ public static CommonOutputs.TransformOutput ImageGrayscale(IHostEnvironment env,
             };
         }
 
-        [TlcModule.EntryPoint(Name = "Transforms.VectorToImage", Desc = VectorToImageTransform.Summary,
-            UserName = VectorToImageTransform.UserName, ShortName = VectorToImageTransform.LoaderSignature)]
-        public static CommonOutputs.TransformOutput VectorToImage(IHostEnvironment env, VectorToImageTransform.Arguments input)
+        [TlcModule.EntryPoint(Name = "Transforms.VectorToImage", Desc = VectorToImageConvertingTransformer.Summary,
+            UserName = VectorToImageConvertingTransformer.UserName, ShortName = VectorToImageConvertingTransformer.LoaderSignature)]
+        public static CommonOutputs.TransformOutput VectorToImage(IHostEnvironment env, VectorToImageConvertingTransformer.Options input)
         {
             var h = EntryPointUtils.CheckArgsAndCreateHost(env, "VectorToImageTransform", input);
-            var xf = new VectorToImageTransform(h, input, input.Data);
+            var xf = VectorToImageConvertingTransformer.Create(h, input, input.Data);
             return new CommonOutputs.TransformOutput()
             {
                 Model = new TransformModelImpl(h, xf, input.Data),

src/Microsoft.ML.ImageAnalytics/ExtensionsCatalog.cs

@@ -72,7 +72,7 @@ public static ImagePixelExtractingEstimator ExtractPixels(this TransformsCatalog
 
         /// <include file='doc.xml' path='doc/members/member[@name="ImagePixelExtractingEstimator"]/*' />
         /// <param name="catalog">The transform's catalog.</param>
-        /// <param name="columns">The name of the columns containing the image paths, and per-column configurations.</param>
+        /// <param name="columns">The name of the columns containing the images, and per-column configurations.</param>
         public static ImagePixelExtractingEstimator ExtractPixels(this TransformsCatalog catalog, params ImagePixelExtractingEstimator.ColumnInfo[] columns)
             => new ImagePixelExtractingEstimator(CatalogUtils.GetEnvironment(catalog), columns);
 
@@ -133,5 +133,33 @@ public static ImageResizingEstimator ResizeImages(this TransformsCatalog catalog
         /// </example>
         public static ImageResizingEstimator ResizeImages(this TransformsCatalog catalog, params ImageResizingEstimator.ColumnInfo[] columns)
             => new ImageResizingEstimator(CatalogUtils.GetEnvironment(catalog), columns);
+
+        /// <summary>
+        /// Converts vectors of pixels into <see cref="ImageType"/> representation.
+        /// </summary>
+        /// <param name="catalog">The transform's catalog.</param>
+        /// <param name="columns">The name of the columns containing the pixels, and per-column configurations.</param>
+        public static VectorToImageConvertingEstimator ConvertToImage(this TransformsCatalog catalog, params VectorToImageConvertingEstimator.ColumnInfo[] columns)
+            => new VectorToImageConvertingEstimator(CatalogUtils.GetEnvironment(catalog), columns);
+
+        /// <summary>
+        /// Converts vectors of pixels into <see cref="ImageType"/> representation.
+        /// </summary>
+        /// <param name="catalog">The transforms' catalog.</param>
+        /// <param name="height">The height of the output images.</param>
+        /// <param name="width">The width of the output images.</param>
+        /// <param name="outputColumnName"> Name of the column resulting from the transformation of <paramref name="inputColumnName"/>.</param>
+        /// <param name="inputColumnName"> Name of column to transform. If set to <see langword="null"/>, the value of the <paramref name="outputColumnName"/> will be used as source.</param>
+        /// <param name="colors"> Specifies which <see cref="ImagePixelExtractingEstimator.ColorBits"/> are in the input pixel vectors. The order of colors is: Alpha, Red, Green Blue.</param>
+        /// <param name="interleave">Whether the pixels are interleaved, meaning whether they are in `ARGB ARGB` order, or separated in the planar form, where the colors are specified one by one
+        /// alpha, red, green, blue for all the pixels of the image. </param>
+        /// <param name="scale">The values are scaled by this value before being converted to pixels.</param>
+        /// <param name="offset">The offset is subtracted (before scaling) before converting the values to pixels.</param>
+        public static VectorToImageConvertingEstimator ConvertToImage(this TransformsCatalog catalog, int height, int width, string outputColumnName, string inputColumnName = null,
+            ImagePixelExtractingEstimator.ColorBits colors = VectorToImageConvertingTransformer.Defaults.Colors,
+            bool interleave = VectorToImageConvertingTransformer.Defaults.InterleaveArgb,
+            float scale = VectorToImageConvertingTransformer.Defaults.Scale,
+            float offset = VectorToImageConvertingTransformer.Defaults.Offset)
+            => new VectorToImageConvertingEstimator(CatalogUtils.GetEnvironment(catalog), height, width, outputColumnName, inputColumnName, colors, interleave, scale, offset);
     }
 }