Add console logger.

src/TensorFlowNET.Core/Eager/EagerRunner.RecordGradient.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Linq;
+using Microsoft.Extensions.Logging;
 using Tensorflow.Gradients;
 using static Tensorflow.Binding;
 using static Tensorflow.tensorflow;
@@ -38,7 +39,7 @@ namespace Tensorflow.Eager
                 }*/
             }
 
-            // Console.WriteLine($"RecordGradient: should_record={should_record}, op_name={op_name}");
+            tf.Logger.LogDebug($"RecordGradient: should_record={should_record}, op_name={op_name}");
             if (!should_record) return should_record;
 
             Tensor[] op_outputs;

src/TensorFlowNET.Core/Eager/EagerRunner.TapeSetPossibleGradientTypes.cs

@@ -0,0 +1,15 @@
+using System;
+using Tensorflow.Gradients;
+using static Tensorflow.Binding;
+using static Tensorflow.tensorflow;
+
+namespace Tensorflow.Eager
+{
+    public partial class EagerRunner
+    {
+        public int TapeSetPossibleGradientTypes(params Tensor[] args)
+        {
+            return 1;
+        }
+    }
+}

src/TensorFlowNET.Core/Eager/IEagerRunner.cs

@@ -40,5 +40,7 @@ namespace Tensorflow.Eager
             Tensor[] results);
 
         bool MustRecordGradient();
+
+        int TapeSetPossibleGradientTypes(params Tensor[] args);
     }
 }

src/TensorFlowNET.Core/Gradients/Tape.RecordOperation.cs

@@ -1,7 +1,9 @@
 using System;
 using System.Collections.Generic;
+using Microsoft.Extensions.Logging;
 using Tensorflow.Util;
 using static Tensorflow.tensorflow;
+using static Tensorflow.Binding;
 
 namespace Tensorflow.Gradients
 {
@@ -34,6 +36,7 @@ namespace Tensorflow.Gradients
             foreach (var o in output_tensors)
             {
                 tensor_tape_[o.GetID()] = op_id;
+                tf.Logger.LogDebug($"RecordOperation: tensor_tape_[{o.GetID()}] = {op_id}");
                 tensor_usage_[o.GetID()] = 1;
                 tensors.Add(o);
             }

src/TensorFlowNET.Core/Gradients/Tape.cs

@@ -1,5 +1,7 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using Tensorflow.Util;
+using Microsoft.Extensions.Logging;
 using static Tensorflow.Binding;
 using static Tensorflow.tensorflow;
 
@@ -42,6 +44,7 @@ namespace Tensorflow.Gradients
             if (!CouldBackprop())
                 return;
 
+            tf.Logger.LogDebug($"Watch tensor_id={tensor_id}");
             tensor_tape_.emplace(tensor_id, -1);
         }
 
@@ -50,8 +53,13 @@ namespace Tensorflow.Gradients
             for (int i = 0; i < tensor_ids.Length; ++i)
             {
                 if (tensor_tape_.find(tensor_ids[i]))
+                {
                     if (IsDtypeTrainable(dtypes[i]))
+                    {
+                        tf.Logger.LogDebug($"tape.h->ShouldRecord: should_record = true, tensor_tape_.size()={tensor_tape_.Count}, tensor_ids[{i}]={tensor_ids[i]}");
                         return true;
+                    }
+                }
             }
             return false;
         }

src/TensorFlowNET.Core/Tensorflow.Binding.csproj

@@ -84,6 +84,9 @@ TensorFlow .NET v0.30 is focused on making more Keras API work including:
   <ItemGroup>
     <PackageReference Include="Google.Protobuf" Version="3.11.4" />
     <PackageReference Include="MethodBoundaryAspect.Fody" Version="2.0.138" />
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="3.1.10" />
+    <PackageReference Include="Microsoft.Extensions.Logging" Version="3.1.10" />
+    <PackageReference Include="Microsoft.Extensions.Logging.Console" Version="3.1.10" />
     <PackageReference Include="NumSharp.Lite" Version="0.1.9" />
     <PackageReference Include="Protobuf.Text" Version="0.4.0" />
   </ItemGroup>

src/TensorFlowNET.Core/tensorflow.cs

@@ -14,6 +14,8 @@
    limitations under the License.
 ******************************************************************************/
 
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Logging;
 using System.Collections.Generic;
 using Tensorflow.Contexts;
 using Tensorflow.Eager;
@@ -41,9 +43,18 @@ namespace Tensorflow
         public OpDefLibrary OpDefLib;
         public Context Context;
         public IEagerRunner Runner;
+        public ILogger Logger;
+        ServiceProvider serviceProvider;
 
         public tensorflow()
         {
+            serviceProvider = new ServiceCollection()
+                .AddLogging(cfg => cfg.AddConsole())
+                .Configure<LoggerFilterOptions>(cfg => cfg.MinLevel = LogLevel.Warning)
+                .BuildServiceProvider();
+
+            Logger = serviceProvider.GetService<ILogger<tensorflow>>();
+
             Status = new Status();
             Context = new Context(new ContextOptions(), Status);
             OpDefLib = new OpDefLibrary();

src/TensorFlowNET.Keras/Engine/Functional.cs

@@ -3,6 +3,7 @@ using System.Collections.Generic;
 using System.Linq;
 using Tensorflow.Keras.ArgsDefinition;
 using Tensorflow.Keras.Utils;
+using Microsoft.Extensions.Logging;
 using static Tensorflow.Binding;
 
 namespace Tensorflow.Keras.Engine
@@ -335,7 +336,7 @@ namespace Tensorflow.Keras.Engine
 
                     var layer_inputs = node.MapArguments(tensor_dict);
 
-                    // Console.WriteLine($"{node.Layer}: {node.Layer.Name}");
+                    tf.Logger.LogDebug($"{node.Layer}: {node.Layer.Name}");
                     var outputs = node.Layer.Apply(layer_inputs, is_training: training);
 
                     // Update tensor_dict for next input