Update source of code

Author: ChengYen-Tang

src/TorchSharp/Utils/tensorboard/GifEncoder/Encoder.cs

@@ -12,6 +12,19 @@ public static partial class tensorboard
             {
                 public static partial class GifEncoder
                 {
+                    /// <summary>
+                    /// Class AnimatedGifEncoder - Encodes a GIF file consisting of one or more frames.
+                    ///
+                    /// No copyright asserted on the source code of this class. May be used for any
+                    /// purpose, however, refer to the Unisys LZW patent for restrictions on use of
+                    /// the associated LZWEncoder class. Please forward any corrections to
+                    /// [email protected].
+                    ///
+                    /// @author Kevin Weiner, FM Software
+                    /// @version 1.03 November 2003
+                    ///
+                    /// https://cs.android.com/android/platform/superproject/+/master:external/glide/third_party/gif_encoder/src/main/java/com/bumptech/glide/gifencoder/AnimatedGifEncoder.java
+                    /// </summary>
                     internal class Encoder : IDisposable
                     {
                         protected int width; // image size

src/TorchSharp/Utils/tensorboard/GifEncoder/LZWEncoder.cs

@@ -15,8 +15,7 @@ public static partial class GifEncoder
                     /// Adapted from Jef Poskanzer's Java port by way of J. M. G. Elliott.
                     /// K Weiner 12/00
                     ///
-                    /// https://github.com/videlalvaro/gifsockets/blob/master/src/java/LZWEncoder.java
-                    /// https://github.com/avianbc/NGif/blob/master/Components/LZWEncoder.cs
+                    /// https://cs.android.com/android/platform/superproject/+/master:external/glide/third_party/gif_encoder/src/main/java/com/bumptech/glide/gifencoder/LZWEncoder.java
                     /// </summary>
                     internal class LZWEncoder
                     {

src/TorchSharp/Utils/tensorboard/GifEncoder/NeuQuant.cs

@@ -12,10 +12,25 @@ public static partial class GifEncoder
                 {
                     /// <summary>
                     /// NeuQuant Neural-Net Quantization Algorithm
-                    /// NEUQUANT Neural-Net quantization algorithm by Anthony Dekker, 1994.
-                    /// See "Kohonen neural networks for optimal colour quantization"
-                    /// in "Network: Computation in Neural Systems" Vol. 5 (1994) pp 351-367.
-                    /// for a discussion of the algorithm.
+                    /// ------------------------------------------
+                    ///
+                    /// Copyright (c) 1994 Anthony Dekker
+                    ///
+                    /// NEUQUANT Neural-Net quantization algorithm by Anthony Dekker, 1994. See
+                    /// "Kohonen neural networks for optimal colour quantization" in "Network:
+                    /// Computation in Neural Systems" Vol. 5 (1994) pp 351-367. for a discussion of
+                    /// the algorithm.
+                    ///
+                    /// Any party obtaining a copy of these files from the author, directly or
+                    /// indirectly, is granted, free of charge, a full and unrestricted irrevocable,
+                    /// world-wide, paid up, royalty-free, nonexclusive right and license to deal in
+                    /// this software and documentation files (the "Software"), including without
+                    /// limitation the rights to use, copy, modify, merge, publish, distribute,
+                    /// sublicense, and/or sell copies of the Software, and to permit persons who
+                    /// receive copies from any such party to do so, with the only requirement being
+                    /// that this copyright notice remain intact.
+                    ///
+                    /// https://cs.android.com/android/platform/superproject/+/master:external/glide/third_party/gif_encoder/src/main/java/com/bumptech/glide/gifencoder/NeuQuant.java
                     /// </summary>
                     internal class NeuQuant
                     {