diff --git a/src/TensorFlowNET.Keras/Engine/BaseLayer.cs b/src/TensorFlowNET.Keras/Engine/BaseLayer.cs
index 35f65357..36c69843 100644
--- a/src/TensorFlowNET.Keras/Engine/BaseLayer.cs
+++ b/src/TensorFlowNET.Keras/Engine/BaseLayer.cs
@@ -1,10 +1,73 @@
-using System;
+using Keras.Layers;
+using NumSharp;
+using System;
 using System.Collections.Generic;
 using System.Text;
 
 namespace Tensorflow.Keras.Engine
 {
-    public class Layer
+    public class TensorFlowOpLayer : Layer
     {
+        public TensorFlowOpLayer(string node_def, string name, NDArray[] constants = null, bool trainable = true, string dtype = null)
+        {
+
+        }
+
+        public override void call(Tensor[] inputs)
+        {
+            throw new NotImplementedException();
+        }
+
+        public override Dictionary<string, object> get_config()
+        {
+            throw new NotImplementedException();
+        }
+
+        private NodeDef _make_node_def(Graph graph) => throw new NotImplementedException();
+
+        private Tensor[] _make_op(Tensor[] inputs) => throw new NotImplementedException();
+
+        private Tensor[] _defun_call(Tensor[] inputs) => throw new NotImplementedException();
+    }
+
+    public class AddLoss : Layer
+    {
+        public AddLoss(bool unconditional)
+        {
+            throw new NotImplementedException();
+        }
+
+        public override void call(Tensor[] inputs)
+        {
+            throw new NotImplementedException();
+        }
+
+        public override Dictionary<string, object> get_config()
+        {
+            throw new NotImplementedException();
+        }
+    }
+
+    public class AddMetric : Layer
+    {
+        public AddMetric(string aggregation = null, string metric_name = null)
+        {
+            throw new NotImplementedException();
+        }
+
+        public override void call(Tensor[] inputs)
+        {
+            throw new NotImplementedException();
+        }
+
+        public override Dictionary<string, object> get_config()
+        {
+            throw new NotImplementedException();
+        }
+    }
+
+    public class KerasHistory
+    {
+
     }
 }
diff --git a/src/TensorFlowNET.Keras/Engine/BaseLayerUtils.cs b/src/TensorFlowNET.Keras/Engine/BaseLayerUtils.cs
index 914aee71..323e9819 100644
--- a/src/TensorFlowNET.Keras/Engine/BaseLayerUtils.cs
+++ b/src/TensorFlowNET.Keras/Engine/BaseLayerUtils.cs
@@ -1,4 +1,5 @@
-using System;
+using Keras.Layers;
+using System;
 using System.Collections.Generic;
 using System.Text;
 using Tensorflow.Keras.Initializers;
@@ -20,5 +21,25 @@ namespace Tensorflow.Keras.Engine
         public bool have_all_keras_metadata(Tensor[] tensors) => throw new NotImplementedException();
 
         public static dynamic generate_placeholders_from_shape(TensorShape shape) => throw new NotImplementedException();
+
+        public Layer[] create_keras_history(Tensor[] tensors) => throw new NotImplementedException();   
+
+        private void _create_keras_history_helper(Tensor[] tensors, TensorFlowOpLayer[] processed_ops, Layer[] created_layers) => throw new NotImplementedException();
+
+        public Tensor[] unnest_if_single_tensor(Tensor[] input_tensors) => throw new NotImplementedException();
+
+        public bool needs_keras_history(Tensor[] tensors, bool ignore_call_context= false) => throw new NotImplementedException();
+
+        public bool is_in_keras_graph() => throw new NotImplementedException();
+
+        public string is_in_eager_or_tf_function() => throw new NotImplementedException();
+
+        public bool is_in_tf_function() => throw new NotImplementedException();
+
+        public bool uses_keras_history(Tensor[] tensors) => throw new NotImplementedException();
+
+        public Tensor[] mark_checked(Tensor[] tensors) => throw new NotImplementedException();
+
+        public CallContext call_context() => throw new NotImplementedException();
     }
 }
diff --git a/src/TensorFlowNET.Keras/Engine/BasePreprocessingLayer.cs b/src/TensorFlowNET.Keras/Engine/BasePreprocessingLayer.cs
index 6beda9fe..61c57d39 100644
--- a/src/TensorFlowNET.Keras/Engine/BasePreprocessingLayer.cs
+++ b/src/TensorFlowNET.Keras/Engine/BasePreprocessingLayer.cs
@@ -1,10 +1,58 @@
-using System;
+using Keras.Layers;
+using NumSharp;
+using System;
 using System.Collections.Generic;
 using System.Text;
+using Tensorflow.Data;
+using Tensorflow.Keras.Initializers;
 
 namespace Tensorflow.Keras.Engine
 {
-    class BasePreprocessingLayer
+    public abstract class PreprocessingLayer : Layer
     {
+        public abstract void adapt(Data.DatasetV1 data, bool reset_state = true);
+    }
+
+    public abstract class Combiner
+    {
+        public abstract dynamic compute(NDArray[] batch_values, dynamic accumulator = null);
+
+        public abstract dynamic merge(dynamic[] accumulators);
+
+        public abstract NDArray[] extract(dynamic accumulator);
+
+        public abstract dynamic restore(Tensor output);
+
+        public abstract string serialize(dynamic accumulator);
+
+        public abstract dynamic deserialize(string encoded_accumulator);
+
+        public override string ToString()
+        {
+            throw new NotImplementedException();
+        }
+    }
+
+    public class CombinerPreprocessingLayer : PreprocessingLayer
+    {
+        public CombinerPreprocessingLayer(Combiner combiner)
+        {
+            throw new NotImplementedException();
+        }
+
+        private void _add_state_variable(string name, TensorShape shape, string dtype, Initializer initializer= null, string partitioner= null, bool? use_resource= null) => throw new NotImplementedException();
+
+        private Dictionary<string, NDArray> _restore_updates() => throw new NotImplementedException();
+
+        private bool _dataset_is_infinite(DatasetV1 dataset) => throw new NotImplementedException();
+
+        private dynamic _get_dataset_iterator(DatasetV1 dataset) => throw new NotImplementedException();
+
+        private void _set_state_variables(Dictionary<string, Tensor> updates) => throw new NotImplementedException();
+
+        public override void adapt(DatasetV1 data, bool reset_state = true)
+        {
+            throw new NotImplementedException();
+        }
     }
 }
diff --git a/src/TensorFlowNET.Keras/Engine/CallContext.cs b/src/TensorFlowNET.Keras/Engine/CallContext.cs
new file mode 100644
index 00000000..5547c6de
--- /dev/null
+++ b/src/TensorFlowNET.Keras/Engine/CallContext.cs
@@ -0,0 +1,45 @@
+using Keras.Layers;
+using System;
+using System.Collections.Generic;
+using System.Reflection;
+using System.Text;
+
+namespace Tensorflow.Keras.Engine
+{
+    public class CallContext
+    {
+        public bool in_keras_graph
+        {
+            get
+            {
+                throw new NotImplementedException();
+            }
+        }
+        public CallContext()
+        {
+
+        }
+
+        public void enter(Layer layer, Tensor[] inputs, Graph build_graph, bool training, Saving saving = null) => throw new NotImplementedException();
+
+        public bool training_arg_passed_to_call(string[] argspec, Dictionary<string, object> args, Dictionary<string, object>  kwargs) => throw new NotImplementedException();
+
+        public dynamic autocast_context_manager(string dtype) => throw new NotImplementedException();
+
+        public bool is_subclassed(Layer layer) => throw new NotImplementedException();
+
+        public bool from_saved_model(Layer layer) => throw new NotImplementedException();
+
+        public bool check_graph_consistency(Tensor tensor = null, string method = "add_loss", bool force_raise = false) => throw new NotImplementedException();
+
+        public dynamic mark_as_return(Tensor[] outputs, dynamic acd) => throw new NotImplementedException();
+
+        public MethodInfo Default(MemberInfo method) => throw new NotImplementedException();
+
+        public void enable_v2_dtype_behavior() => throw new NotImplementedException();
+
+        public void disable_v2_dtype_behavior() => throw new NotImplementedException();
+
+        public void v2_dtype_behavior_enabled() => throw new NotImplementedException();
+    }
+}
diff --git a/src/TensorFlowNET.Keras/Engine/Saving.cs b/src/TensorFlowNET.Keras/Engine/Saving.cs
index 43ba2cf6..8ba804c3 100644
--- a/src/TensorFlowNET.Keras/Engine/Saving.cs
+++ b/src/TensorFlowNET.Keras/Engine/Saving.cs
@@ -4,7 +4,7 @@ using System.Text;
 
 namespace Tensorflow.Keras.Engine
 {
-    class Saving
+    public class Saving
     {
     }
 }
diff --git a/src/TensorFlowNET.Keras/Engine/TrackableWeightHandler.cs b/src/TensorFlowNET.Keras/Engine/TrackableWeightHandler.cs
new file mode 100644
index 00000000..c6305809
--- /dev/null
+++ b/src/TensorFlowNET.Keras/Engine/TrackableWeightHandler.cs
@@ -0,0 +1,26 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Tensorflow.Keras.Engine
+{
+    public class TrackableWeightHandler
+    {
+        public int num_tensors
+        {
+            get
+            {
+                throw new NotImplementedException();
+            }
+        }
+
+        public TrackableWeightHandler(bool trackable)
+        {
+            throw new NotImplementedException();
+        }
+
+        public void set_weights(Tensor[] weights) => throw new NotImplementedException();
+
+        public void _set_weights_v1(Tensor[] weights) => throw new NotImplementedException();
+    }
+}
diff --git a/src/TensorFlowNET.Keras/IInitializer.cs b/src/TensorFlowNET.Keras/IInitializer.cs
deleted file mode 100644
index d69e0d1b..00000000
--- a/src/TensorFlowNET.Keras/IInitializer.cs
+++ /dev/null
@@ -1,6 +0,0 @@
-namespace Keras
-{
-    interface IInitializer
-    {
-    }
-}
diff --git a/src/TensorFlowNET.Keras/Layers/Layer.cs b/src/TensorFlowNET.Keras/Layers/Layer.cs
index 7e23fd71..eb231fad 100644
--- a/src/TensorFlowNET.Keras/Layers/Layer.cs
+++ b/src/TensorFlowNET.Keras/Layers/Layer.cs
@@ -1,14 +1,205 @@
-using System;
+using NumSharp;
+using System;
 using System.Collections.Generic;
 using Tensorflow;
 using Tensorflow.Keras.Constraints;
 using Tensorflow.Keras.Initializers;
+using Tensorflow.Keras.Losses;
+using Tensorflow.Keras.Metrics;
 using Tensorflow.Keras.Regularizers;
 
 namespace Keras.Layers
 {
     public abstract class Layer
     {
+        public TF_DataType dtype
+        {
+            get
+            {
+                throw new NotImplementedException();
+            }
+        }
+
+        public string name
+        {
+            get
+            {
+                throw new NotImplementedException();
+            }
+        }
+
+        public bool stateful
+        {
+            get
+            {
+                throw new NotImplementedException();
+            }
+            set
+            {
+                throw new NotImplementedException();
+            }
+        }
+
+        public bool trainable
+        {
+            get
+            {
+                throw new NotImplementedException();
+            }
+        }
+
+        public Regularizer activity_regularizer
+        {
+            get
+            {
+                throw new NotImplementedException();
+            }
+            set
+            {
+                throw new NotImplementedException();
+            }
+        }
+
+        public dynamic input_spec
+        {
+            get
+            {
+                throw new NotImplementedException();
+            }
+            set
+            {
+                throw new NotImplementedException();
+            }
+        }
+
+        public Tensor[] trainable_weights
+        {
+            get
+            {
+                throw new NotImplementedException();
+            }
+        }
+
+        public Tensor[] non_trainable_weights
+        {
+            get
+            {
+                throw new NotImplementedException();
+            }
+        }
+
+        private Tensor[] _weights
+        {
+            get
+            {
+                throw new NotImplementedException();
+            }
+        }
+
+        public Func<bool>[] updates
+        {
+            get
+            {
+                throw new NotImplementedException();
+            }
+        }
+
+        public Tensor[] losses
+        {
+            get
+            {
+                throw new NotImplementedException();
+            }
+        }
+
+        public Tensor[] metrics
+        {
+            get
+            {
+                throw new NotImplementedException();
+            }
+        }
+
+        public Tensor[] input_mask
+        {
+            get
+            {
+                throw new NotImplementedException();
+            }
+        }
+
+        public Tensor[] output_mask
+        {
+            get
+            {
+                throw new NotImplementedException();
+            }
+        }
+
+        public Tensor[] input
+        {
+            get
+            {
+                throw new NotImplementedException();
+            }
+        }
+
+        public Tensor[] output
+        {
+            get
+            {
+                throw new NotImplementedException();
+            }
+        }
+
+        public TensorShape[] input_shape
+        {
+            get
+            {
+                throw new NotImplementedException();
+            }
+        }
+
+        public TensorShape[] output_shape
+        {
+            get
+            {
+                throw new NotImplementedException();
+            }
+        }
+
+        public Tensor[] variables
+        {
+            get
+            {
+                return _weights;
+            }
+        }
+
+        public Tensor[] trainable_variables
+        {
+            get
+            {
+                return trainable_weights;
+            }
+        }
+
+        public Tensor[] non_trainable_variables
+        {
+            get
+            {
+                return non_trainable_weights;
+            }
+        }
+
+        private string _compute_dtype
+        {
+            get
+            {
+                throw new NotImplementedException();
+            }
+        }
+
         public Layer(bool trainable = true, string name = null, string dtype = null, bool @dynamic = false, Dictionary<string, object> kwargs = null)
         {
 
@@ -16,7 +207,7 @@ namespace Keras.Layers
 
         public void build(TensorShape shape) => throw new NotImplementedException();
 
-        public void call(Tensor[] inputs) => throw new NotImplementedException();
+        public virtual void call(Tensor[] inputs) => throw new NotImplementedException();
 
         public void _add_trackable(dynamic trackable_object, bool trainable) => throw new NotImplementedException();
 
@@ -25,12 +216,207 @@ namespace Keras.Layers
                                 dynamic partitioner= null, bool? use_resource= null, VariableSynchronization synchronization= VariableSynchronization.Auto,
                                 VariableAggregation aggregation= VariableAggregation.None, Dictionary<string, object> kwargs = null) => throw new NotImplementedException();
 
-        public Dictionary<string, object> get_config() => throw new NotImplementedException();
+        public virtual Dictionary<string, object> get_config() => throw new NotImplementedException();
 
         public Layer from_config(Dictionary<string, object> config) => throw new NotImplementedException();
 
         public TensorShape compute_output_shape(TensorShape input_shape) => throw new NotImplementedException();
 
         public dynamic compute_output_signature(dynamic input_signature) => throw new NotImplementedException();
-    }
+
+        public Tensor[] compute_mask(Tensor[] inputs, Tensor[] mask = null) => throw new NotImplementedException();
+
+        public void __call__(Tensor[] inputs) => throw new NotImplementedException();
+
+        public void add_loss(Loss[] losses, Tensor[] inputs = null) => throw new NotImplementedException();
+
+        public void _clear_losses() => throw new NotImplementedException();
+
+        public void add_metric(Tensor value, string aggregation= null, string name= null) => throw new NotImplementedException();
+
+        public void add_update(Func<bool>[] updates) => throw new NotImplementedException();
+
+        public void set_weights(NDArray[] weights) => throw new NotImplementedException();
+
+        public NDArray[] get_weights() => throw new NotImplementedException();
+
+        public Func<bool>[] get_updates_for(Tensor[] inputs) => throw new NotImplementedException();
+
+        public Tensor[] get_losses_for(Tensor[] inputs) => throw new NotImplementedException();
+
+        public Tensor[] get_input_mask_at(int node_index) => throw new NotImplementedException();
+
+        public Tensor[] get_output_mask_at(int node_index) => throw new NotImplementedException();
+
+        public TensorShape[] get_input_shape_at(int node_index) => throw new NotImplementedException();
+
+        public TensorShape[] get_output_shape_at(int node_index) => throw new NotImplementedException();
+
+        public Tensor[] get_input_at(int node_index) => throw new NotImplementedException();
+
+        public Tensor[] get_output_at(int node_index) => throw new NotImplementedException();
+
+        public int count_params() => throw new NotImplementedException();
+
+        private void _set_dtype_policy(string dtype) => throw new NotImplementedException();
+
+        private Tensor _maybe_cast_inputs(Tensor inputs) => throw new NotImplementedException();
+
+        private void _warn_about_input_casting(string input_dtype) => throw new NotImplementedException();
+
+        private string _name_scope()
+        {
+            return name;
+        }
+
+        private string _obj_reference_counts
+        {
+            get
+            {
+                throw new NotImplementedException();
+            }
+        }
+
+        private dynamic _attribute_sentinel
+        {
+            get
+            {
+                throw new NotImplementedException();
+            }
+        }
+
+        private dynamic _call_full_argspec
+        {
+            get
+            {
+                throw new NotImplementedException();
+            }
+        }
+
+        private string[] _call_fn_args
+        {
+            get
+            {
+                throw new NotImplementedException();
+            }
+        }
+
+        private string[] _call_accepts_kwargs
+        {
+            get
+            {
+                throw new NotImplementedException();
+            }
+        }
+
+        private bool _should_compute_mask
+        {
+            get
+            {
+                throw new NotImplementedException();
+            }
+        }
+
+        private Tensor[] _eager_losses
+        {
+            get
+            {
+                throw new NotImplementedException();
+            }
+            set
+            {
+                throw new NotImplementedException();
+            }
+        }
+
+        private dynamic _trackable_saved_model_saver
+        {
+            get
+            {
+                throw new NotImplementedException();
+            }
+        }
+
+        private string _object_identifier
+        {
+            get
+            {
+                throw new NotImplementedException();
+            }
+        }
+
+        private string _tracking_metadata
+        {
+            get
+            {
+                throw new NotImplementedException();
+            }
+        }
+
+        public Dictionary<string, bool> state
+        {
+            get
+            {
+                throw new NotImplementedException();
+            }
+            set
+            {
+                throw new NotImplementedException();
+            }
+        }
+
+        private void _init_set_name(string name, bool zero_based= true) => throw new NotImplementedException();
+
+        private Metric _get_existing_metric(string name = null) => throw new NotImplementedException();
+
+        private void _eager_add_metric(Metric value, string aggregation= null, string name= null) => throw new NotImplementedException();
+
+        private void _symbolic_add_metric(Metric value, string aggregation = null, string name = null) => throw new NotImplementedException();
+
+        private void _handle_weight_regularization(string name, VariableV1 variable, Regularizer regularizer) => throw new NotImplementedException();
+
+        private void _handle_activity_regularization(Tensor[] inputs, Tensor[] outputs) => throw new NotImplementedException();
+
+        private void _set_mask_metadata(Tensor[] inputs, Tensor[]  outputs, Tensor previous_mask) => throw new NotImplementedException();
+
+        private Tensor[] _collect_input_masks(Tensor[] inputs, Dictionary<string, object> args, Dictionary<string, object> kwargs) => throw new NotImplementedException();
+
+        private bool _call_arg_was_passed(string arg_name, Dictionary<string, object> args, Dictionary<string, object> kwargs, bool inputs_in_args= false) => throw new NotImplementedException();
+
+        private T _get_call_arg_value<T>(string arg_name, Dictionary<string, object> args, Dictionary<string, object> kwargs, bool inputs_in_args = false) => throw new NotImplementedException();
+
+        private (Tensor[], Tensor[]) _set_connectivity_metadata_(Tensor[] inputs, Tensor[] outputs, Dictionary<string, object> args, Dictionary<string, object> kwargs) => throw new NotImplementedException();
+
+        private void _add_inbound_node(Tensor[] input_tensors, Tensor[] output_tensors, Dictionary<string, object> args = null) => throw new NotImplementedException();
+
+        private AttrValue _get_node_attribute_at_index(int node_index, string attr, string attr_name) => throw new NotImplementedException();
+
+        private void _maybe_build(Tensor[] inputs) => throw new NotImplementedException();
+
+        private void _symbolic_call(Tensor[] inputs) => throw new NotImplementedException();
+
+        private Dictionary<Layer, bool> _get_trainable_state() => throw new NotImplementedException();
+
+        private void _set_trainable_state(bool trainable_state) => throw new NotImplementedException();
+
+        private void _maybe_create_attribute(string name, object default_value) => throw new NotImplementedException();
+
+        private void __delattr__(string name) => throw new NotImplementedException();
+
+        private void __setattr__(string name, object value) => throw new NotImplementedException();
+
+        private List<AttrValue> _gather_children_attribute(string attribute) => throw new NotImplementedException();
+
+        private List<Layer> _gather_unique_layers() => throw new NotImplementedException();
+
+        private List<Layer> _gather_layers() => throw new NotImplementedException();
+
+        private bool _is_layer() => throw new NotImplementedException();
+
+        private void _init_call_fn_args() => throw new NotImplementedException();
+
+        public dynamic _list_extra_dependencies_for_serialization(dynamic serialization_cache) => throw new NotImplementedException();
+
+        public dynamic _list_functions_for_serialization(dynamic serialization_cache) => throw new NotImplementedException();
+    } 
 }
diff --git a/src/TensorFlowNET.Keras/Losses/Loss.cs b/src/TensorFlowNET.Keras/Losses/Loss.cs
index 55d9b100..49246027 100644
--- a/src/TensorFlowNET.Keras/Losses/Loss.cs
+++ b/src/TensorFlowNET.Keras/Losses/Loss.cs
@@ -4,7 +4,7 @@ using System.Text;
 
 namespace Tensorflow.Keras.Losses
 {
-    class Loss
+    public abstract class Loss
     {
     }
 }