update:loss

src/TensorFlowNET.Core/Operations/array_ops.cs

@@ -506,6 +506,27 @@ namespace Tensorflow
             }
         }
 
+
+        public static Tensor where_v2(Tensor condition, object x = null, object y = null, string name = null)
+        {
+            if (x == null && y == null)
+            {
+                return tf_with(ops.name_scope(name, "Where", new { condition }), scope =>
+                {
+                    name = scope;
+                    condition = ops.convert_to_tensor(condition, preferred_dtype: dtypes.@bool, name: "condition");
+                    return gen_array_ops.where(condition: condition, name: name);
+                });
+            }
+            else if (x != null && y != null)
+            {
+                return gen_array_ops.select_v2(condition, x, y, name);
+            }
+            else
+            {
+                throw new ValueError("x and y must both be non-None or both be None.");
+            }
+        }
         /// <summary>
         /// Returns the shape of a tensor.
         /// </summary>

src/TensorFlowNET.Core/Operations/gen_array_ops.cs

@@ -423,6 +423,21 @@ namespace Tensorflow
             var _op = tf.OpDefLib._apply_op_helper("Select", name, new { condition, t = x, e = y });
             return _op.outputs[0];
         }
+        public static Tensor select_v2<Tx, Ty>(Tensor condition, Tx x, Ty y, string name = null)
+        {
+            if (tf.Context.executing_eagerly())
+            {
+                var results = tf.Runner.TFE_FastPathExecute(tf.Context, tf.Context.DeviceName,
+                    "SelectV2", name,
+                    null,
+                    condition, x, y);
+
+                return results[0];
+            }
+
+            var _op = tf.OpDefLib._apply_op_helper("SelectV2", name, new { condition, t = x, e = y });
+            return _op.outputs[0];
+        }
 
         public static Tensor scatter_nd(Tensor indices, Tensor updates, Tensor[] shape, string name = null)
         {

src/TensorFlowNET.Core/Operations/gen_math_ops.cs

@@ -714,7 +714,23 @@ namespace Tensorflow
 
             return _op.outputs[0];
         }
+        public static Tensor softplus(Tensor features, string name = null)
+        {
+            if (tf.Context.executing_eagerly())
+            {
+                var results = tf.Runner.TFE_FastPathExecute(tf.Context, tf.Context.DeviceName,
+                    "Softplus", name,
+                    null,
+                    features);
 
+                return results[0];
+            }
+
+            var _op = tf.OpDefLib._apply_op_helper("Softplus", name, args: new { features });
+
+            return _op.outputs[0];
+        }
+        
         public static Tensor cast(Tensor x, TF_DataType DstT, bool Truncate = false, string name = null)
             => tf.Context.RunInAutoMode(()
                 => tf.OpDefLib._apply_op_helper("Cast", name, args: new { x, DstT, Truncate }).output, ()
@@ -1068,6 +1084,15 @@ namespace Tensorflow
 
         public static Tensor _abs(Tensor x, string name = null)
         {
+            if (tf.Context.executing_eagerly())
+            {
+                var results = tf.Runner.TFE_FastPathExecute(tf.Context, tf.Context.DeviceName,
+                    "Abs", name,
+                     null,
+                     x);
+
+                return results[0];
+            }
             var _op = tf.OpDefLib._apply_op_helper("Abs", name, args: new { x });
 
             return _op.output;
@@ -1202,6 +1227,15 @@ namespace Tensorflow
         /// <returns></returns>
         public static Tensor rsqrt(Tensor x, string name = null)
         {
+            if (tf.Context.executing_eagerly())
+            {
+                var results = tf.Runner.TFE_FastPathExecute(tf.Context, tf.Context.DeviceName,
+                    "Rsqrt", name,
+                    null,
+                    x);
+
+                return results[0];
+            }
             var _op = tf.OpDefLib._apply_op_helper("Rsqrt", name, new { x });
 
             return _op.outputs[0];

src/TensorFlowNET.Core/Operations/nn_impl.py.cs

@@ -31,7 +31,7 @@ namespace Tensorflow
         /// <returns></returns>
         public static Tensor l2_normalize(Tensor x,
             int axis = 0,
-            float epsilon = 1e-12f,
+            Tensor epsilon =null,
             string name = null)
         {
             return tf_with(ops.name_scope(name, "l2_normalize", new { x }), scope =>
@@ -39,7 +39,7 @@ namespace Tensorflow
                 x = ops.convert_to_tensor(x, name: "x");
                 var sq = math_ops.square(x);
                 var square_sum = math_ops.reduce_sum(sq, axis, keepdims: true);
-                var x_inv_norm = math_ops.rsqrt(math_ops.maximum(square_sum, epsilon));
+                var x_inv_norm = math_ops.rsqrt(math_ops.maximum(square_sum, epsilon == null ? tf.Variable(1e-12f) : epsilon));
                 return math_ops.multiply(x, x_inv_norm, name: name);
             });
         }

src/TensorFlowNET.Keras/Losses/CategoricalCrossentropy.cs

@@ -9,18 +9,19 @@ namespace Tensorflow.Keras.Losses
     public class CategoricalCrossentropy : LossFunctionWrapper, ILossFunc
     {
         float label_smoothing;
-
-        public CategoricalCrossentropy(bool from_logits = false,
+        public CategoricalCrossentropy(
+            bool from_logits = false,
             float label_smoothing = 0,
-            string reduction = ReductionV2.AUTO,
-            string name = "categorical_crossentropy") :
-            base(reduction: reduction, 
-                name: name,
-                from_logits: from_logits)
+            string reduction = null,
+            string name = null) :
+            base(reduction: reduction,
+                 name: name == null ? "categorical_crossentropy" : name, 
+                 from_logits: from_logits)
         {
             this.label_smoothing = label_smoothing;
         }
 
+
         public override Tensor Apply(Tensor y_true, Tensor y_pred, bool from_logits = false, int axis = -1)
         {
             // Try to adjust the shape so that rank of labels = rank of logits - 1.

src/TensorFlowNET.Keras/Losses/CosineSimilarity.cs

@@ -0,0 +1,28 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using static Tensorflow.Binding;
+using static Tensorflow.KerasApi;
+
+namespace Tensorflow.Keras.Losses
+{
+    public class CosineSimilarity : LossFunctionWrapper, ILossFunc
+    {
+        protected int axis=-1;
+        public CosineSimilarity(
+            string reduction = null,
+            int axis=-1,
+            string name = null) :
+            base(reduction: reduction, name: name == null ? "cosine_similarity" : name)
+        {
+            this.axis = axis;
+        }
+
+        public override Tensor Apply(Tensor y_true = null, Tensor y_pred =null, bool from_logits = false, int axis = -1)
+        {
+            Tensor y_true_normalize = nn_impl.l2_normalize(y_true, axis : this.axis);
+            Tensor y_pred_normalize = nn_impl.l2_normalize(y_pred, axis: this.axis);
+            return -math_ops.reduce_sum(y_true_normalize * y_pred_normalize, axis : this.axis);
+        }
+    }
+}

src/TensorFlowNET.Keras/Losses/Huber.cs

@@ -0,0 +1,36 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using static Tensorflow.Binding;
+using static Tensorflow.KerasApi;
+
+namespace Tensorflow.Keras.Losses
+{
+    public class Huber : LossFunctionWrapper, ILossFunc
+    {
+        protected Tensor delta = tf.Variable(1.0) ;
+        public Huber (
+            string reduction = null,
+            Tensor delta = null,
+            string name = null) :
+            base(reduction: reduction, name: name == null ? "huber" : name)
+        {
+            this.delta = delta==null? this.delta: delta;
+            
+        }
+
+        public override Tensor Apply(Tensor y_true = null, Tensor y_pred =null, bool from_logits = false, int axis = -1)
+        {
+            Tensor y_pred_cast = math_ops.cast(y_pred, dtype: TF_DataType.TF_FLOAT);
+            Tensor y_true_cast = math_ops.cast(y_true, dtype: TF_DataType.TF_FLOAT);
+            Tensor delta = math_ops.cast(this.delta, dtype: TF_DataType.TF_FLOAT);
+            Tensor error = math_ops.subtract(y_pred_cast, y_true_cast);
+            Tensor abs_error = math_ops.abs(error);
+            Tensor half = ops.convert_to_tensor(0.5, dtype: abs_error.dtype);
+            return gen_math_ops.mean(array_ops.where_v2(abs_error <= delta, 
+                                                        half * math_ops.pow(error, 2), 
+                                                        half * math_ops.pow(delta, 2) + delta * (abs_error - delta)),
+                                     axis : -1);
+        }
+    }
+}

src/TensorFlowNET.Keras/Losses/ILossFunc.cs

@@ -2,7 +2,8 @@
 {
     public interface ILossFunc
     {
-        string Reduction { get; }
+        public string Reduction { get; }
+        public string Name { get; }
         Tensor Call(Tensor y_true, Tensor y_pred, Tensor sample_weight = null);
     }
 }

src/TensorFlowNET.Keras/Losses/LogCosh.cs

@@ -0,0 +1,28 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using Tensorflow.Operations;
+using static Tensorflow.Binding;
+using static Tensorflow.KerasApi;
+
+namespace Tensorflow.Keras.Losses
+{
+    public class LogCosh : LossFunctionWrapper, ILossFunc
+    {
+        public LogCosh(
+            string reduction = null,
+            string name = null) :
+            base(reduction: reduction, name: name == null ? "huber" : name){ }
+
+        public override Tensor Apply(Tensor y_true = null, Tensor y_pred =null, bool from_logits = false, int axis = -1)
+        {
+            Tensor y_pred_dispatch = ops.convert_to_tensor(y_pred);
+            Tensor y_true_cast = gen_math_ops.cast(y_true, y_pred_dispatch.dtype);
+            Tensor x = y_pred_dispatch - y_true_cast;
+       
+            return gen_math_ops.mean(x + gen_math_ops.softplus(-2.0 * x) - math_ops.cast(math_ops.log(tf.Variable(2.0)), x.dtype),axis: -1);
+            
+
+        }
+    }
+}

src/TensorFlowNET.Keras/Losses/Loss.cs

@@ -15,12 +15,12 @@ namespace Tensorflow.Keras.Losses
         string _name_scope;
 
         public string Reduction => reduction;
-
+        public string Name => name;
         public Loss(string reduction = ReductionV2.AUTO, 
             string name = null,
             bool from_logits = false)
         {
-            this.reduction = reduction;
+            this.reduction = reduction == null ? ReductionV2.SUM_OVER_BATCH_SIZE : reduction;
             this.name = name;
             this.from_logits = from_logits;
             _allow_sum_over_batch_size = false;
@@ -34,8 +34,7 @@ namespace Tensorflow.Keras.Losses
         public Tensor Call(Tensor y_true, Tensor y_pred, Tensor sample_weight = null)
         {
             var losses = Apply(y_true, y_pred, from_logits: from_logits);
-
-            return losses_utils.compute_weighted_loss(losses, reduction: this.reduction == null?ReductionV2.SUM_OVER_BATCH_SIZE : this.reduction, sample_weight: sample_weight);
+            return losses_utils.compute_weighted_loss(losses, reduction: this.reduction , sample_weight: sample_weight);
         }
 
         void _set_name_scope()

src/TensorFlowNET.Keras/Losses/LossesApi.cs

@@ -2,13 +2,31 @@
 {
     public class LossesApi
     {
-        public ILossFunc SparseCategoricalCrossentropy(bool from_logits = false)
-            => new SparseCategoricalCrossentropy(from_logits: from_logits);
+        public ILossFunc SparseCategoricalCrossentropy(string reduction = null, string name = null,bool from_logits = false)
+            => new SparseCategoricalCrossentropy(reduction: reduction, name: name,from_logits: from_logits);
 
-        public ILossFunc CategoricalCrossentropy(bool from_logits = false)
-            => new CategoricalCrossentropy(from_logits: from_logits);
+        public ILossFunc CategoricalCrossentropy(string reduction = null, string name = null,bool from_logits = false)
+            => new CategoricalCrossentropy(reduction: reduction, name: name,from_logits: from_logits);
         
-        public ILossFunc MeanSquaredError(string reduction = null)
-          => new MeanSquaredError(reduction: reduction);
+        public ILossFunc MeanSquaredError(string reduction = null, string name = null)
+            => new MeanSquaredError(reduction: reduction, name:name);
+        public ILossFunc MeanSquaredLogarithmicError(string reduction = null, string name = null)
+           => new MeanSquaredLogarithmicError(reduction: reduction, name: name);
+
+        public ILossFunc MeanAbsolutePercentageError(string reduction = null, string name = null)
+           => new MeanAbsolutePercentageError(reduction: reduction, name: name);
+
+        public ILossFunc MeanAbsoluteError(string reduction = null, string name = null)
+           => new MeanAbsoluteError(reduction: reduction, name: name);
+
+        public ILossFunc CosineSimilarity(string reduction = null, string name = null,int axis=-1)
+            => new CosineSimilarity(reduction: reduction, name: name, axis: axis);
+
+        public ILossFunc Huber(string reduction = null, string name = null, Tensor delta=null)
+            => new Huber(reduction: reduction, name: name, delta: delta);
+
+        public ILossFunc LogCosh(string reduction = null, string name = null)
+            => new LogCosh(reduction: reduction, name: name);
+
     }
 }

src/TensorFlowNET.Keras/Losses/MeanAbsoluteError.cs

@@ -0,0 +1,23 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using static Tensorflow.Binding;
+using static Tensorflow.KerasApi;
+
+namespace Tensorflow.Keras.Losses
+{
+    public class MeanAbsoluteError : LossFunctionWrapper, ILossFunc
+    {
+        public MeanAbsoluteError(
+            string reduction = null,
+            string name = null) :
+            base(reduction: reduction, name: name == null ? "mean_absolute_error" : name){ }
+
+        public override Tensor Apply(Tensor y_true = null, Tensor y_pred =null, bool from_logits = false, int axis = -1)
+        {
+            Tensor y_pred_dispatch = ops.convert_to_tensor(y_pred);
+            Tensor y_true_cast = gen_math_ops.cast(y_true, y_pred_dispatch.dtype);
+            return  gen_math_ops.mean(math_ops.abs(y_pred_dispatch - y_true_cast), axis: -1);
+        }
+    }
+}

src/TensorFlowNET.Keras/Losses/MeanAbsolutePercentageError.cs

@@ -0,0 +1,24 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using static Tensorflow.Binding;
+using static Tensorflow.KerasApi;
+
+namespace Tensorflow.Keras.Losses
+{
+    public class MeanAbsolutePercentageError : LossFunctionWrapper, ILossFunc
+    {
+        public MeanAbsolutePercentageError(
+            string reduction = null,
+            string name = null) :
+            base(reduction: reduction, name: name == null ? "mean_absolute_percentage_error" : name){ }
+
+        public override Tensor Apply(Tensor y_true = null, Tensor y_pred =null, bool from_logits = false, int axis = -1)
+        {
+            Tensor y_pred_dispatch = ops.convert_to_tensor(y_pred);
+            Tensor y_true_cast = gen_math_ops.cast(y_true, y_pred_dispatch.dtype);
+            Tensor diff = math_ops.abs(y_true_cast - y_pred_dispatch) / gen_math_ops.maximum(math_ops.abs(y_true_cast), gen_math_ops.cast(tf.constant(1e-7), y_pred_dispatch.dtype));
+            return gen_math_ops.cast(tf.constant(100), y_pred_dispatch.dtype) *gen_math_ops.mean(diff, axis: -1);
+        }
+    }
+}

src/TensorFlowNET.Keras/Losses/MeanSquaredError.cs

@@ -9,12 +9,9 @@ namespace Tensorflow.Keras.Losses
     public class MeanSquaredError : LossFunctionWrapper, ILossFunc
     {
         public MeanSquaredError(
-            string reduction = ReductionV2.AUTO,
-            string name = "mean_squared_error") :
-            base(reduction: reduction, 
-                name: name)
-        {
-        }
+            string reduction = null,
+            string name = null) :
+            base(reduction: reduction, name: name==null? "mean_squared_error" : name){ }
 
         public override Tensor Apply(Tensor y_true = null, Tensor y_pred =null, bool from_logits = false, int axis = -1)
         {

src/TensorFlowNET.Keras/Losses/MeanSquaredLogarithmicError.cs

@@ -0,0 +1,33 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using static Tensorflow.Binding;
+using static Tensorflow.KerasApi;
+
+namespace Tensorflow.Keras.Losses
+{
+    public class MeanSquaredLogarithmicError : LossFunctionWrapper, ILossFunc
+    {
+        public MeanSquaredLogarithmicError(
+            string reduction = null,
+            string name = null) :
+            base(reduction: reduction, name: name == null ? "mean_squared_logarithmic_error" : name){ }
+
+
+        public override Tensor Apply(Tensor y_true = null, Tensor y_pred =null, bool from_logits = false, int axis = -1)
+        {
+            Tensor y_pred_dispatch = ops.convert_to_tensor(y_pred);
+            Tensor y_true_cast = gen_math_ops.cast(y_true, y_pred_dispatch.dtype);
+            Tensor first_log=null, second_log=null;
+            if (y_pred_dispatch.dtype == TF_DataType.TF_DOUBLE) {
+                first_log = math_ops.log(gen_math_ops.maximum(y_pred_dispatch, 1e-7) + 1.0);
+                second_log = math_ops.log(gen_math_ops.maximum(y_true_cast, 1e-7) + 1.0);
+            }
+            else {
+                first_log = math_ops.log(gen_math_ops.maximum(y_pred_dispatch, 1e-7f) + 1.0f);
+                second_log = math_ops.log(gen_math_ops.maximum(y_true_cast, 1e-7f) + 1.0f);
+            }
+            return gen_math_ops.mean(gen_math_ops.squared_difference(first_log, second_log), axis: -1);
+        }
+    }
+}

src/TensorFlowNET.Keras/Losses/ReductionV2.cs

@@ -4,6 +4,7 @@
     {
         public const string NONE = "none";
         public const string AUTO = "auto";
+        public const string SUM = "sum";
         public const string SUM_OVER_BATCH_SIZE = "sum_over_batch_size";
         public const string WEIGHTED_MEAN = "weighted_mean";
     }

src/TensorFlowNET.Keras/Losses/SparseCategoricalCrossentropy.cs

@@ -4,14 +4,11 @@ namespace Tensorflow.Keras.Losses
 {
     public class SparseCategoricalCrossentropy : LossFunctionWrapper, ILossFunc
     {
-        public SparseCategoricalCrossentropy(bool from_logits = false,
-            string reduction = ReductionV2.AUTO,
-            string name = "sparse_categorical_crossentropy") :
-            base(reduction: reduction,
-                name: name)
-        {
-
-        }
+        public SparseCategoricalCrossentropy(
+            bool from_logits = false,
+            string reduction = null,
+            string name = null) :
+            base(reduction: reduction, name: name == null ? "sparse_categorical_crossentropy" : name){ }
 
         public override Tensor Apply(Tensor target, Tensor output, bool from_logits = false, int axis = -1)
         {

test/TensorFlowNET.UnitTest/Keras/CosineSimilarity.Test.cs

@@ -0,0 +1,76 @@
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NumSharp;
+using Tensorflow;
+using Tensorflow.Keras.Losses;
+using static Tensorflow.Binding;
+using static Tensorflow.KerasApi;
+
+namespace TensorFlowNET.UnitTest.Keras
+{
+    [TestClass]
+    public class CosineSimilarity
+    {
+        //https://keras.io/api/losses/regression_losses/
+
+        NDArray y_true_float = new float[,] { { 0.0f, 1.0f }, { 1.0f, 1.0f } };
+        NDArray y_pred_float = new float[,] { { 1.0f, 0.0f }, { 1.0f, 1.0f } };
+
+        [TestMethod]
+      
+        public void _Default()
+        {
+            //>>> # Using 'auto'/'sum_over_batch_size' reduction type.  
+            //>>> cosine_loss = tf.keras.losses.CosineSimilarity(axis = 1)
+            //>>> # l2_norm(y_true) = [[0., 1.], [1./1.414], 1./1.414]]]  
+            //>>> # l2_norm(y_pred) = [[1., 0.], [1./1.414], 1./1.414]]]  
+            //>>> # l2_norm(y_true) . l2_norm(y_pred) = [[0., 0.], [0.5, 0.5]]  
+            //>>> # loss = mean(sum(l2_norm(y_true) . l2_norm(y_pred), axis=1))  
+            //>>> #       = -((0. + 0.) +  (0.5 + 0.5)) / 2  
+            //-0.5
+            var loss = keras.losses.CosineSimilarity(axis : 1);
+            var call = loss.Call(y_true_float, y_pred_float);
+            Assert.AreEqual((NDArray)(-0.49999997f), call.numpy());
+        }
+
+        [TestMethod]
+
+        public void _Sample_Weight()
+        {
+            //>>> # Calling with 'sample_weight'.  
+            //>>> cosine_loss(y_true, y_pred, sample_weight =[0.8, 0.2]).numpy()
+            //- 0.0999
+            var loss = keras.losses.CosineSimilarity();
+            var call = loss.Call(y_true_float, y_pred_float, sample_weight: (NDArray)new float[] { 0.8f, 0.2f });
+            Assert.AreEqual((NDArray) (- 0.099999994f), call.numpy());
+        }
+
+        [TestMethod]
+
+        public void _SUM()
+        {
+            //>>> # Using 'sum' reduction type.  
+            //>>> cosine_loss = tf.keras.losses.CosineSimilarity(axis = 1,
+            //...     reduction = tf.keras.losses.Reduction.SUM)
+            //>>> cosine_loss(y_true, y_pred).numpy()
+            //- 0.999
+            var loss = keras.losses.CosineSimilarity(axis: 1,reduction : ReductionV2.SUM);
+            var call = loss.Call(y_true_float, y_pred_float);
+            Assert.AreEqual((NDArray)(-0.99999994f), call.numpy());
+        }
+
+        [TestMethod]
+
+        public void _None()
+        {
+            //>>> # Using 'none' reduction type.  
+            //>>> cosine_loss = tf.keras.losses.CosineSimilarity(axis = 1,
+            //...     reduction = tf.keras.losses.Reduction.NONE)
+            //>>> cosine_loss(y_true, y_pred).numpy()
+            //array([-0., -0.999], dtype = float32)
+            var loss = keras.losses.CosineSimilarity(axis :1, reduction: ReductionV2.NONE);
+            var call = loss.Call(y_true_float, y_pred_float);
+            Assert.AreEqual((NDArray)new float[] { -0f, -0.99999994f }, call.numpy());
+        }
+
+    }
+}

test/TensorFlowNET.UnitTest/Keras/Huber.Test.cs

@@ -0,0 +1,72 @@
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NumSharp;
+using Tensorflow;
+using Tensorflow.Keras.Losses;
+using static Tensorflow.Binding;
+using static Tensorflow.KerasApi;
+
+namespace TensorFlowNET.UnitTest.Keras
+{
+    [TestClass]
+    public class Huber
+    {
+        //https://keras.io/api/losses/regression_losses/#meansquarederror-class
+
+        NDArray y_true_float = new float[,] { { 0.0f, 1.0f }, { 0.0f, 0.0f } };
+        NDArray y_pred_float = new float[,] { { 0.6f, 0.4f }, { 0.4f, 0.6f } };
+
+        [TestMethod]
+      
+        public void _Default()
+        {
+            //>>> # Using 'auto'/'sum_over_batch_size' reduction type.  
+            //>>> h = tf.keras.losses.Huber()
+            //>>> h(y_true, y_pred).numpy()
+            //0.155
+            var loss = keras.losses.Huber();
+            var call = loss.Call(y_true_float, y_pred_float);
+            Assert.AreEqual((NDArray)0.155f, call.numpy());
+        }
+
+        [TestMethod]
+
+        public void _Sample_Weight()
+        {
+            //>>> # Calling with 'sample_weight'.  
+            //>>> h(y_true, y_pred, sample_weight =[1, 0]).numpy()
+            //0.09
+            var loss = keras.losses.Huber();
+            var call = loss.Call(y_true_float, y_pred_float, sample_weight: (NDArray)new float[] { 0.1f, 0.0f });
+            Assert.AreEqual((NDArray)0.009000001f, call.numpy());
+        }
+
+        [TestMethod]
+
+        public void _SUM()
+        {
+            //>>> # Using 'sum' reduction type.  
+            //>>> h = tf.keras.losses.Huber(
+            //...     reduction = tf.keras.losses.Reduction.SUM)
+            //>>> h(y_true, y_pred).numpy()
+            //0.31
+            var loss = keras.losses.Huber(reduction : ReductionV2.SUM);
+            var call = loss.Call(y_true_float, y_pred_float);
+            Assert.AreEqual((NDArray)0.31f, call.numpy());
+        }
+
+        [TestMethod]
+
+        public void _None()
+        {
+            //>>> # Using 'none' reduction type.  
+            //>>> h = tf.keras.losses.Huber(
+            //...     reduction = tf.keras.losses.Reduction.NONE)
+            //>>> h(y_true, y_pred).numpy()
+            //array([0.18, 0.13], dtype = float32)
+            var loss = keras.losses.Huber(reduction: ReductionV2.NONE);
+            var call = loss.Call(y_true_float, y_pred_float);
+            Assert.AreEqual((NDArray)new float[] { 0.18f, 0.13000001f }, call.numpy());
+        }
+
+    }
+}

test/TensorFlowNET.UnitTest/Keras/LogCosh.Test.cs

@@ -0,0 +1,72 @@
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NumSharp;
+using Tensorflow;
+using Tensorflow.Keras.Losses;
+using static Tensorflow.Binding;
+using static Tensorflow.KerasApi;
+
+namespace TensorFlowNET.UnitTest.Keras
+{
+    [TestClass]
+    public class LogCosh
+    {
+        //https://keras.io/api/losses/regression_losses/#meansquarederror-class
+
+        NDArray y_true_float = new float[,] { { 0.0f, 1.0f }, { 0.0f, 0.0f } };
+        NDArray y_pred_float = new float[,] { { 1.0f, 1.0f }, { 0.0f, 0.0f } };
+
+        [TestMethod]
+      
+        public void _Default()
+        {
+            //>>> # Using 'auto'/'sum_over_batch_size' reduction type.  
+            //>>> l = tf.keras.losses.LogCosh()
+            //>>> l(y_true, y_pred).numpy()
+            //0.108
+            var loss = keras.losses.LogCosh();
+            var call = loss.Call(y_true_float, y_pred_float);
+            Assert.AreEqual((NDArray)0.1084452f, call.numpy());
+        }
+
+        [TestMethod]
+
+        public void _Sample_Weight()
+        {
+        //>>> # Calling with 'sample_weight'.  
+        //>>> l(y_true, y_pred, sample_weight =[0.8, 0.2]).numpy()
+        //0.087
+            var loss = keras.losses.LogCosh();
+            var call = loss.Call(y_true_float, y_pred_float, sample_weight: (NDArray)new float[] { 0.8f, 0.2f });
+            Assert.AreEqual((NDArray)0.08675616f, call.numpy());
+        }
+
+        [TestMethod]
+
+        public void _SUM()
+        {
+            //>>> # Using 'sum' reduction type.  
+            //>>> l = tf.keras.losses.LogCosh(
+            //...     reduction = tf.keras.losses.Reduction.SUM)
+            //>>> l(y_true, y_pred).numpy()
+            //0.217
+            var loss = keras.losses.LogCosh(reduction : ReductionV2.SUM);
+            var call = loss.Call(y_true_float, y_pred_float);
+            Assert.AreEqual((NDArray)0.2168904f, call.numpy());
+        }
+
+        [TestMethod]
+
+        public void _None()
+        {
+            //>>> # Using 'none' reduction type.  
+            //>>> l = tf.keras.losses.LogCosh(
+            //...     reduction = tf.keras.losses.Reduction.NONE)
+            //>>> l(y_true, y_pred).numpy()
+            //array([0.217, 0.], dtype = float32)
+            var loss = keras.losses.LogCosh(reduction: ReductionV2.NONE);
+            var call = loss.Call(y_true_float, y_pred_float);
+            Assert.AreEqual((NDArray)new float[] { 0.2168904f, 0.0f }, call.numpy());
+        }
+
+    }
+}

test/TensorFlowNET.UnitTest/Keras/MeanAbsoluteError.Test.cs

@@ -0,0 +1,73 @@
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NumSharp;
+using Tensorflow;
+using Tensorflow.Keras.Losses;
+using static Tensorflow.Binding;
+using static Tensorflow.KerasApi;
+
+namespace TensorFlowNET.UnitTest.Keras
+{
+    [TestClass]
+    public class MeanAbsoluteError
+    {
+        //https://keras.io/api/losses/regression_losses/
+
+        NDArray y_true_float = new float[,] { { 0.0f, 1.0f }, { 0.0f, 0.0f } };
+        NDArray y_pred_float = new float[,] { { 1.0f, 1.0f }, { 1.0f, 0.0f } };
+
+        [TestMethod]
+
+        public void _Default()
+        {
+
+            //>>> # Using 'auto'/'sum_over_batch_size' reduction type.  
+            //>>> mae = tf.keras.losses.MeanAbsoluteError()
+            //>>> mae(y_true, y_pred).numpy()
+            //0.5
+            var loss = keras.losses.MeanAbsoluteError();
+            var call = loss.Call(y_true_float, y_pred_float);
+            Assert.AreEqual((NDArray)(0.5f), call.numpy());
+        }
+
+        [TestMethod]
+
+        public void _Sample_Weight()
+        {
+            //>>> # Calling with 'sample_weight'.  
+            //>>> mae(y_true, y_pred, sample_weight =[0.7, 0.3]).numpy()
+            //0.25
+            var loss = keras.losses.MeanAbsoluteError();
+            var call = loss.Call(y_true_float, y_pred_float, sample_weight: (NDArray)new float[] { 0.7f, 0.3f });
+            Assert.AreEqual((NDArray)(0.25f), call.numpy());
+        }
+
+        [TestMethod]
+
+        public void _SUM()
+        {
+            //>>> # Using 'sum' reduction type.  
+            //>>> mae = tf.keras.losses.MeanAbsoluteError(
+            //...     reduction = tf.keras.losses.Reduction.SUM)
+            //>>> mae(y_true, y_pred).numpy()
+            //1.0
+            var loss = keras.losses.MeanAbsoluteError( reduction: ReductionV2.SUM);
+            var call = loss.Call(y_true_float, y_pred_float);
+            Assert.AreEqual((NDArray)(1.0f), call.numpy());
+        }
+
+        [TestMethod]
+
+        public void _None()
+        {
+            //>>> # Using 'none' reduction type.  
+            //>>> mae = tf.keras.losses.MeanAbsoluteError(
+            //...     reduction = tf.keras.losses.Reduction.NONE)
+            //>>> mae(y_true, y_pred).numpy()
+            //array([0.5, 0.5], dtype = float32)
+            var loss = keras.losses.MeanAbsoluteError(reduction: ReductionV2.NONE);
+            var call = loss.Call(y_true_float, y_pred_float);
+            Assert.AreEqual((NDArray)new float[] { 0.5f, 0.5f }, call.numpy());
+        }
+
+    }
+}

test/TensorFlowNET.UnitTest/Keras/MeanAbsolutePercentageError.Test.cs

@@ -0,0 +1,72 @@
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NumSharp;
+using Tensorflow;
+using Tensorflow.Keras.Losses;
+using static Tensorflow.Binding;
+using static Tensorflow.KerasApi;
+
+namespace TensorFlowNET.UnitTest.Keras
+{
+    [TestClass]
+    public class MeanAbsolutePercentageError
+    {
+        //https://keras.io/api/losses/regression_losses/
+
+        NDArray y_true_float = new float[,] { { 2.0f, 1.0f }, { 2.0f, 3.0f } };
+        NDArray y_pred_float = new float[,] { { 1.0f, 1.0f }, { 1.0f, 0.0f } };
+
+        [TestMethod]
+
+        public void _Default()
+        {
+            //>>> # Using 'auto'/'sum_over_batch_size' reduction type.  
+            //>>> mape = tf.keras.losses.MeanAbsolutePercentageError()
+            //>>> mape(y_true, y_pred).numpy()
+            //50.
+            var loss = keras.losses.MeanAbsolutePercentageError();
+            var call = loss.Call(y_true_float, y_pred_float);
+            Assert.AreEqual((NDArray)(50f), call.numpy());
+        }
+
+        [TestMethod]
+
+        public void _Sample_Weight()
+        {
+            //>>> # Calling with 'sample_weight'.  
+            //>>> mape(y_true, y_pred, sample_weight =[0.7, 0.3]).numpy()
+            //20.
+            var loss = keras.losses.MeanAbsolutePercentageError();
+            var call = loss.Call(y_true_float, y_pred_float, sample_weight: (NDArray)new float[] { 0.7f, 0.3f });
+            Assert.AreEqual((NDArray)(20f), call.numpy());
+        }
+
+        [TestMethod]
+
+        public void _SUM()
+        {
+            //>>> # Using 'sum' reduction type.  
+            //>>> mape = tf.keras.losses.MeanAbsolutePercentageError(
+            //...     reduction = tf.keras.losses.Reduction.SUM)
+            //>>> mape(y_true, y_pred).numpy()
+            //100.
+            var loss = keras.losses.MeanAbsolutePercentageError( reduction: ReductionV2.SUM);
+            var call = loss.Call(y_true_float, y_pred_float);
+            Assert.AreEqual((NDArray)(100f), call.numpy());
+        }
+
+        [TestMethod]
+
+        public void _None()
+        {
+            //>>> # Using 'none' reduction type.  
+            //>>> mape = tf.keras.losses.MeanAbsolutePercentageError(
+            //...     reduction = tf.keras.losses.Reduction.NONE)
+            //>>> mape(y_true, y_pred).numpy()
+            //array([25., 75.], dtype = float32)
+            var loss = keras.losses.MeanAbsolutePercentageError(reduction: ReductionV2.NONE);
+            var call = loss.Call(y_true_float, y_pred_float);
+            Assert.AreEqual((NDArray)new float[] { 25f, 75f }, call.numpy());
+        }
+
+    }
+}

test/TensorFlowNET.UnitTest/Keras/MeanSquaredLogarithmicError.Test.cs

@@ -0,0 +1,72 @@
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NumSharp;
+using Tensorflow;
+using Tensorflow.Keras.Losses;
+using static Tensorflow.Binding;
+using static Tensorflow.KerasApi;
+
+namespace TensorFlowNET.UnitTest.Keras
+{
+    [TestClass]
+    public class MeanSquaredLogarithmicError
+    {
+        //https://keras.io/api/losses/regression_losses/
+
+        NDArray y_true_float = new float[,] { { 0.0f, 1.0f }, { 0.0f, 0.0f } };
+        NDArray y_pred_float = new float[,] { { 1.0f, 1.0f }, { 1.0f, 0.0f } };
+
+        [TestMethod]
+
+        public void _Default()
+        {
+            //>>> # Using 'auto'/'sum_over_batch_size' reduction type.  
+            //>>> msle = tf.keras.losses.MeanSquaredLogarithmicError()
+            //>>> msle(y_true, y_pred).numpy()
+            //0.240
+            var loss = keras.losses.MeanSquaredLogarithmicError();
+            var call = loss.Call(y_true_float, y_pred_float);
+            Assert.AreEqual((NDArray)(0.24022643f), call.numpy());
+        }
+
+        [TestMethod]
+
+        public void _Sample_Weight()
+        {
+            //>>> # Calling with 'sample_weight'.  
+            //>>> msle(y_true, y_pred, sample_weight =[0.7, 0.3]).numpy()
+            //0.120
+            var loss = keras.losses.MeanSquaredLogarithmicError();
+            var call = loss.Call(y_true_float, y_pred_float, sample_weight: (NDArray)new float[] { 0.7f, 0.3f });
+            Assert.AreEqual((NDArray)(0.12011322f), call.numpy());
+        }
+
+        [TestMethod]
+
+        public void _SUM()
+        {
+            //>>> # Using 'sum' reduction type.  
+            //>>> msle = tf.keras.losses.MeanSquaredLogarithmicError(
+            //...     reduction = tf.keras.losses.Reduction.SUM)
+            //>>> msle(y_true, y_pred).numpy()
+            //0.480
+            var loss = keras.losses.MeanSquaredLogarithmicError( reduction: ReductionV2.SUM);
+            var call = loss.Call(y_true_float, y_pred_float);
+            Assert.AreEqual((NDArray)(0.48045287f), call.numpy());
+        }
+
+        [TestMethod]
+
+        public void _None()
+        {
+            //>>> # Using 'none' reduction type.  
+            //>>> msle = tf.keras.losses.MeanSquaredLogarithmicError(
+            //...     reduction = tf.keras.losses.Reduction.NONE)
+            //>>> msle(y_true, y_pred).numpy()
+            //array([0.240, 0.240], dtype = float32)
+            var loss = keras.losses.MeanSquaredLogarithmicError(reduction: ReductionV2.NONE);
+            var call = loss.Call(y_true_float, y_pred_float);
+            Assert.AreEqual((NDArray)new float[] { 0.24022643f, 0.24022643f }, call.numpy());
+        }
+
+    }
+}