Add a Tag to Tensor, Fixed Tensor Slice, AdamOptimizer #271

src/TensorFlowNET.Core/Framework/IndexedSlices.cs

@@ -31,11 +31,18 @@ namespace Tensorflow.Framework
             _values = values;
             _indices = indices;
             _dense_shape = dense_shape;
+
+            _values.Tag = this;
         }
 
         public static implicit operator Tensor(IndexedSlices indexedSlices)
         {
             return indexedSlices.values;
         }
+
+        public static implicit operator IndexedSlices(Tensor tensor)
+        {
+            return tensor.Tag as IndexedSlices;
+        }
     }
 }

src/TensorFlowNET.Core/Gradients/array_grad.cs

@@ -156,7 +156,7 @@ namespace Tensorflow.Gradients
             // For axis 0 gathers, build an appropriately shaped IndexedSlices.
             if((int)axis_static == 0)
             {
-                var params_tail_shape = params_shape[1];
+                var params_tail_shape = params_shape[new NumSharp.Slice(start:1)];
                 var values_shape = array_ops.concat(new[] { indices_size, params_tail_shape }, 0);
                 var values = array_ops.reshape(grad, values_shape);
                 indices = array_ops.reshape(indices, indices_size);

src/TensorFlowNET.Core/Operations/gen_array_ops.cs

@@ -223,8 +223,8 @@ namespace Tensorflow
         {
             var _op = _op_def_lib._apply_op_helper("Unique", name, new { x, out_idx });
             // TODO
-            throw new NotImplementedException("_result = _UniqueOutput._make(_result)");
-            // return _op.outputs[0];
+            //var _result = _UniqueOutput._make(_op.outputs);
+            return (_op.outputs[0], _op.outputs[1]);
         }
 
         public static Tensor where()

src/TensorFlowNET.Core/Tensors/Tensor.cs

@@ -58,6 +58,11 @@ namespace Tensorflow
 
         private TF_Output? _tf_output;
 
+        /// <summary>
+        /// used for keep other pointer when do implicit operating
+        /// </summary>
+        public object Tag { get; set; }
+
         public int[] shape
         {
             get
@@ -219,11 +224,11 @@ namespace Tensorflow
             }
         }
 
-        public Tensor this[int start, int? stop, int? step]
+        public Tensor this[Slice slice]
         {
             get
             {
-                var slice_spec = new int[] { start };
+                var slice_spec = new int[] { slice.Start.Value };
                 var begin = new List<int>();
                 var end = new List<int>();
                 var strides = new List<int>();
@@ -236,14 +241,16 @@ namespace Tensorflow
                 foreach (var s in slice_spec)
                 {
                     begin.Add(s);
-                    if (stop == null)
+                    if(slice.Stop.HasValue)
+                    {
+                        end.Add(slice.Stop.Value);
+                    }
+                    else
                     {
                         end.Add(0);
                         end_mask |= (1 << index);
                     }
-                    else
-                        end.Add(s + 1);
-                    strides.Add(1);
+                    strides.Add(slice.Step);
 
                     index += 1;
                 }
@@ -277,7 +284,57 @@ namespace Tensorflow
             }
         }
 
-        public Tensor this[int slice_spec] => this[slice_spec, null, null];
+        public Tensor this[int start]
+        {
+            get
+            {
+                var slice_spec = new int[] { start };
+                var begin = new List<int>();
+                var end = new List<int>();
+                var strides = new List<int>();
+
+                var index = 0;
+                var (new_axis_mask, shrink_axis_mask) = (0, 0);
+                var (begin_mask, end_mask) = (0, 0);
+                var ellipsis_mask = 0;
+
+                foreach (var s in slice_spec)
+                {
+                    begin.Add(s);
+                    end.Add(s + 1);
+                    strides.Add(1);
+                    shrink_axis_mask |= (1 << index);
+                    index += 1;
+                }
+
+                return with(ops.name_scope(null, "strided_slice", new { begin, end, strides }), scope =>
+                {
+                    string name = scope;
+                    if (begin != null)
+                    {
+                        var (packed_begin, packed_end, packed_strides) =
+                            (array_ops.stack(begin.ToArray()),
+                            array_ops.stack(end.ToArray()),
+                            array_ops.stack(strides.ToArray()));
+
+                        return gen_array_ops.strided_slice(
+                            this,
+                            packed_begin,
+                            packed_end,
+                            packed_strides,
+                            begin_mask: begin_mask,
+                            end_mask: end_mask,
+                            shrink_axis_mask: shrink_axis_mask,
+                            new_axis_mask: new_axis_mask,
+                            ellipsis_mask: ellipsis_mask,
+
+                            name: name);
+                    }
+
+                    throw new NotImplementedException("");
+                });
+            }
+        }
 
         public override string ToString()
         {

src/TensorFlowNET.Core/Train/Optimizer.cs

@@ -227,9 +227,8 @@ namespace Tensorflow
         public virtual (Tensor, Tensor) _deduplicate_indexed_slices(Tensor values, Tensor indices)
         {
             var (unique_indices, new_index_positions) = array_ops.unique(indices);
-            var summed_values = math_ops.unsorted_segment_sum(
-                values, new_index_positions,
-                array_ops.shape(unique_indices)[0]);
+            var shape = array_ops.shape(unique_indices)[0];
+            var summed_values = math_ops.unsorted_segment_sum(values, new_index_positions, shape);
             return (summed_values, unique_indices);
         }
 

src/TensorFlowNET.Core/Train/_OptimizableVariable.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Text;
+using Tensorflow.Framework;
 
 namespace Tensorflow
 {

src/TensorFlowNET.Core/Train/optimizer.py.cs

@@ -29,14 +29,16 @@ namespace Tensorflow
 
         public Operation update_op(Optimizer optimizer, Tensor g)
         {
-            var update_op = optimizer._apply_dense(g, _v);
-
-            return update_op;
-        }
-
-        public Operation update_op(Optimizer optimizer, IndexedSlices g)
-        {
-            var update_op = optimizer._apply_dense(g, _v);
+            Operation update_op = null;
+
+            if (g.Tag == null)
+            {
+                update_op = optimizer._apply_dense(g, _v);
+            }
+            else if (g.Tag is IndexedSlices)
+            {
+                return optimizer._apply_sparse_duplicate_indices(g, _v);
+            }
 
             return update_op;
         }