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feat: IL kernel migration for reductions, scans, and math ops
IL Kernel Infrastructure: - Add ILKernelGenerator.Scan.cs for CumSum scan kernels with SIMD V128/V256/V512 paths - Extend ILKernelGenerator.Reduction.cs with Var/Std/ArgMax/ArgMin axis reduction support - Extend ILKernelGenerator.Clip.cs with strided/broadcast array helpers - Extend ILKernelGenerator.Modf.cs with special value handling (NaN, Inf, -0) - Add IKernelProvider interface extensions for new kernel types DefaultEngine Migrations: - Default.Reduction.Var.cs: IL fast path for contiguous arrays, single-element fix - Default.Reduction.Std.cs: IL fast path for contiguous arrays, single-element fix - Default.Reduction.CumAdd.cs: IL scan kernel integration - Default.Reduction.ArgMax.cs: IL axis reduction with proper coordinate tracking - Default.Reduction.ArgMin.cs: IL axis reduction with proper coordinate tracking - Default.Power.cs: Scalar exponent path migrated to IL kernels - Default.Clip.cs: Unified IL path (76% code reduction, 914→240 lines) - Default.NonZero.cs: Strided IL fallback path - Default.Modf.cs: Unified IL with special float handling Bug Fixes: - np.var.cs / np.std.cs: ddof parameter now properly passed through - Var/Std single-element arrays now return double (matching NumPy) Tests (3,500+ lines added): - ArgMaxArgMinComprehensiveTests.cs: 480 lines covering all dtypes, shapes, axes - VarStdComprehensiveTests.cs: 462 lines covering ddof, empty arrays, edge cases - CumSumComprehensiveTests.cs: 381 lines covering accumulation, overflow, dtypes - np_nonzero_strided_tests.cs: 221 lines for strided/transposed array support - 7 NumPyPortedTests files: Edge cases from NumPy test suite Code Impact: - Net reduction: 543 lines removed (6,532 added - 2,172 removed from templates) - ReductionTests.cs removed (884 lines) - replaced by comprehensive per-operation tests - Eliminated ~1MB of switch/case template code via IL generation Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
1 parent e64c1f4 commit 7196466

30 files changed

Lines changed: 6532 additions & 2172 deletions

‎src/NumSharp.Core/Backends/Default/Indexing/Default.NonZero.cs‎

Lines changed: 39 additions & 268 deletions
Original file line numberDiff line numberDiff line change
@@ -1,12 +1,6 @@
11
using System;
22
using NumSharp.Generic;
3-
using NumSharp.Utilities;
43
using System.Collections.Generic;
5-
using System.Diagnostics;
6-
using System.Threading;
7-
using System.Linq;
8-
using System.Threading.Tasks;
9-
using NumSharp.Backends;
104
using NumSharp.Backends.Kernels;
115

126
namespace NumSharp.Backends
@@ -16,48 +10,46 @@ public partial class DefaultEngine
1610
/// <summary>
1711
/// Return the indices of non-zero elements.
1812
/// </summary>
19-
/// <param name="nd"></param>
20-
/// <returns></returns>
13+
/// <remarks>
14+
/// NumPy-aligned behavior:
15+
/// - Returns tuple of arrays, one per dimension
16+
/// - For empty arrays, returns empty arrays with correct dtype (int)
17+
/// - Iterates in C-order (row-major)
18+
/// - Handles contiguous and strided arrays efficiently
19+
/// </remarks>
20+
/// <param name="nd">Input array</param>
21+
/// <returns>Array of NDArray&lt;int&gt;, one per dimension containing indices of non-zero elements</returns>
2122
public override NDArray<int>[] NonZero(in NDArray nd)
2223
{
23-
#if _REGEN
24-
#region Compute
25-
switch (nd.typecode)
26-
{
27-
%foreach supported_dtypes,supported_dtypes_lowercase%
28-
case NPTypeCode.#1: return nonzeros<#2>(nd.MakeGeneric<#2>());
29-
%
30-
default:
31-
throw new NotSupportedException();
32-
}
33-
#endregion
34-
#else
35-
36-
#region Compute
37-
switch (nd.typecode)
38-
{
39-
case NPTypeCode.Boolean: return nonzeros<bool>(nd.MakeGeneric<bool>());
40-
case NPTypeCode.Byte: return nonzeros<byte>(nd.MakeGeneric<byte>());
41-
case NPTypeCode.Int16: return nonzeros<short>(nd.MakeGeneric<short>());
42-
case NPTypeCode.UInt16: return nonzeros<ushort>(nd.MakeGeneric<ushort>());
43-
case NPTypeCode.Int32: return nonzeros<int>(nd.MakeGeneric<int>());
44-
case NPTypeCode.UInt32: return nonzeros<uint>(nd.MakeGeneric<uint>());
45-
case NPTypeCode.Int64: return nonzeros<long>(nd.MakeGeneric<long>());
46-
case NPTypeCode.UInt64: return nonzeros<ulong>(nd.MakeGeneric<ulong>());
47-
case NPTypeCode.Char: return nonzeros<char>(nd.MakeGeneric<char>());
48-
case NPTypeCode.Double: return nonzeros<double>(nd.MakeGeneric<double>());
49-
case NPTypeCode.Single: return nonzeros<float>(nd.MakeGeneric<float>());
50-
case NPTypeCode.Decimal: return nonzeros<decimal>(nd.MakeGeneric<decimal>());
51-
default:
52-
throw new NotSupportedException();
53-
}
54-
#endregion
55-
#endif
24+
// Type dispatch to generic implementation
25+
switch (nd.typecode)
26+
{
27+
case NPTypeCode.Boolean: return nonzeros<bool>(nd.MakeGeneric<bool>());
28+
case NPTypeCode.Byte: return nonzeros<byte>(nd.MakeGeneric<byte>());
29+
case NPTypeCode.Int16: return nonzeros<short>(nd.MakeGeneric<short>());
30+
case NPTypeCode.UInt16: return nonzeros<ushort>(nd.MakeGeneric<ushort>());
31+
case NPTypeCode.Int32: return nonzeros<int>(nd.MakeGeneric<int>());
32+
case NPTypeCode.UInt32: return nonzeros<uint>(nd.MakeGeneric<uint>());
33+
case NPTypeCode.Int64: return nonzeros<long>(nd.MakeGeneric<long>());
34+
case NPTypeCode.UInt64: return nonzeros<ulong>(nd.MakeGeneric<ulong>());
35+
case NPTypeCode.Char: return nonzeros<char>(nd.MakeGeneric<char>());
36+
case NPTypeCode.Double: return nonzeros<double>(nd.MakeGeneric<double>());
37+
case NPTypeCode.Single: return nonzeros<float>(nd.MakeGeneric<float>());
38+
case NPTypeCode.Decimal: return nonzeros<decimal>(nd.MakeGeneric<decimal>());
39+
default:
40+
throw new NotSupportedException($"NonZero not supported for type {nd.typecode}");
41+
}
5642
}
5743

44+
/// <summary>
45+
/// Generic implementation of nonzero using ILKernelGenerator.
46+
/// Both contiguous and strided paths now use the unified IL-based approach.
47+
/// </summary>
5848
private static unsafe NDArray<int>[] nonzeros<T>(NDArray<T> x) where T : unmanaged
5949
{
50+
// Ensure at least 1D (NumPy behavior)
6051
x = np.atleast_1d(x).MakeGeneric<T>();
52+
var shape = x.Shape;
6153
var size = x.size;
6254
var ndim = x.ndim;
6355

@@ -71,240 +63,19 @@ private static unsafe NDArray<int>[] nonzeros<T>(NDArray<T> x) where T : unmanag
7163
return emptyResult;
7264
}
7365

74-
// SIMD fast path for contiguous arrays
7566
var kp = DefaultKernelProvider;
76-
if (x.Shape.IsContiguous && kp.Enabled && kp.VectorBits > 0)
67+
68+
// SIMD fast path for contiguous arrays
69+
if (shape.IsContiguous && kp.Enabled && kp.VectorBits > 0)
7770
{
7871
var flatIndices = new List<int>(Math.Max(16, size / 4));
7972
kp.FindNonZero((T*)x.Address, size, flatIndices);
8073
return kp.ConvertFlatToCoordinates(flatIndices, x.shape);
8174
}
8275

83-
// Original path for non-contiguous arrays
84-
var nonzeroCoords = new List<int[]>(size / 3);
85-
#if _REGEN
86-
#region Compute
87-
Func<int[], int> getOffset = x.Shape.GetOffset;
88-
switch (x.typecode) {
89-
%foreach supported_dtypes, supported_dtypes_lowercase%
90-
case NPTypeCode.#1: {
91-
var incr = new ValueCoordinatesIncrementor(x.shape);
92-
var coords = incr.Index;
93-
var src = (#2*)x.Address;
94-
int offset;
95-
do
96-
{
97-
offset = getOffset(coords);
98-
if (!(src[offset] == default(#2)))
99-
nonzeroCoords.Add(coords.CloneArray());
100-
} while (incr.Next() != null);
101-
102-
break;
103-
}
104-
%
105-
default: throw new NotSupportedException();
106-
}
107-
#endregion
108-
#else
109-
#region Compute
110-
Func<int[], int> getOffset = x.Shape.GetOffset;
111-
switch (x.typecode) {
112-
case NPTypeCode.Boolean: {
113-
var incr = new ValueCoordinatesIncrementor(x.shape);
114-
var coords = incr.Index;
115-
var src = (bool*)x.Address;
116-
int offset;
117-
do
118-
{
119-
offset = getOffset(coords);
120-
if (!(src[offset] == default(bool)))
121-
nonzeroCoords.Add(coords.CloneArray());
122-
} while (incr.Next() != null);
123-
124-
break;
125-
}
126-
case NPTypeCode.Byte: {
127-
var incr = new ValueCoordinatesIncrementor(x.shape);
128-
var coords = incr.Index;
129-
var src = (byte*)x.Address;
130-
int offset;
131-
do
132-
{
133-
offset = getOffset(coords);
134-
if (!(src[offset] == default(byte)))
135-
nonzeroCoords.Add(coords.CloneArray());
136-
} while (incr.Next() != null);
137-
138-
break;
139-
}
140-
case NPTypeCode.Int16: {
141-
var incr = new ValueCoordinatesIncrementor(x.shape);
142-
var coords = incr.Index;
143-
var src = (short*)x.Address;
144-
int offset;
145-
do
146-
{
147-
offset = getOffset(coords);
148-
if (!(src[offset] == default(short)))
149-
nonzeroCoords.Add(coords.CloneArray());
150-
} while (incr.Next() != null);
151-
152-
break;
153-
}
154-
case NPTypeCode.UInt16: {
155-
var incr = new ValueCoordinatesIncrementor(x.shape);
156-
var coords = incr.Index;
157-
var src = (ushort*)x.Address;
158-
int offset;
159-
do
160-
{
161-
offset = getOffset(coords);
162-
if (!(src[offset] == default(ushort)))
163-
nonzeroCoords.Add(coords.CloneArray());
164-
} while (incr.Next() != null);
165-
166-
break;
167-
}
168-
case NPTypeCode.Int32: {
169-
var incr = new ValueCoordinatesIncrementor(x.shape);
170-
var coords = incr.Index;
171-
var src = (int*)x.Address;
172-
int offset;
173-
do
174-
{
175-
offset = getOffset(coords);
176-
if (!(src[offset] == default(int)))
177-
nonzeroCoords.Add(coords.CloneArray());
178-
} while (incr.Next() != null);
179-
180-
break;
181-
}
182-
case NPTypeCode.UInt32: {
183-
var incr = new ValueCoordinatesIncrementor(x.shape);
184-
var coords = incr.Index;
185-
var src = (uint*)x.Address;
186-
int offset;
187-
do
188-
{
189-
offset = getOffset(coords);
190-
if (!(src[offset] == default(uint)))
191-
nonzeroCoords.Add(coords.CloneArray());
192-
} while (incr.Next() != null);
193-
194-
break;
195-
}
196-
case NPTypeCode.Int64: {
197-
var incr = new ValueCoordinatesIncrementor(x.shape);
198-
var coords = incr.Index;
199-
var src = (long*)x.Address;
200-
int offset;
201-
do
202-
{
203-
offset = getOffset(coords);
204-
if (!(src[offset] == default(long)))
205-
nonzeroCoords.Add(coords.CloneArray());
206-
} while (incr.Next() != null);
207-
208-
break;
209-
}
210-
case NPTypeCode.UInt64: {
211-
var incr = new ValueCoordinatesIncrementor(x.shape);
212-
var coords = incr.Index;
213-
var src = (ulong*)x.Address;
214-
int offset;
215-
do
216-
{
217-
offset = getOffset(coords);
218-
if (!(src[offset] == default(ulong)))
219-
nonzeroCoords.Add(coords.CloneArray());
220-
} while (incr.Next() != null);
221-
222-
break;
223-
}
224-
case NPTypeCode.Char: {
225-
var incr = new ValueCoordinatesIncrementor(x.shape);
226-
var coords = incr.Index;
227-
var src = (char*)x.Address;
228-
int offset;
229-
do
230-
{
231-
offset = getOffset(coords);
232-
if (!(src[offset] == default(char)))
233-
nonzeroCoords.Add(coords.CloneArray());
234-
} while (incr.Next() != null);
235-
236-
break;
237-
}
238-
case NPTypeCode.Double: {
239-
var incr = new ValueCoordinatesIncrementor(x.shape);
240-
var coords = incr.Index;
241-
var src = (double*)x.Address;
242-
int offset;
243-
do
244-
{
245-
offset = getOffset(coords);
246-
if (!(src[offset] == default(double)))
247-
nonzeroCoords.Add(coords.CloneArray());
248-
} while (incr.Next() != null);
249-
250-
break;
251-
}
252-
case NPTypeCode.Single: {
253-
var incr = new ValueCoordinatesIncrementor(x.shape);
254-
var coords = incr.Index;
255-
var src = (float*)x.Address;
256-
int offset;
257-
do
258-
{
259-
offset = getOffset(coords);
260-
if (!(src[offset] == default(float)))
261-
nonzeroCoords.Add(coords.CloneArray());
262-
} while (incr.Next() != null);
263-
264-
break;
265-
}
266-
case NPTypeCode.Decimal: {
267-
var incr = new ValueCoordinatesIncrementor(x.shape);
268-
var coords = incr.Index;
269-
var src = (decimal*)x.Address;
270-
int offset;
271-
do
272-
{
273-
offset = getOffset(coords);
274-
if (!(src[offset] == default(decimal)))
275-
nonzeroCoords.Add(coords.CloneArray());
276-
} while (incr.Next() != null);
277-
278-
break;
279-
}
280-
default: throw new NotSupportedException();
281-
}
282-
#endregion
283-
#endif
284-
285-
var len = nonzeroCoords.Count;
286-
//create ndarray for each dimension
287-
var ret = new NDArray<int>[ndim];
288-
for (int i = 0; i < x.ndim; i++)
289-
ret[i] = new NDArray<int>(len);
290-
291-
//create address for each dimension
292-
var addresses = new int*[ndim];
293-
for (int i = 0; i < ndim; i++)
294-
addresses[i] = (int*)ret[i].Address;
295-
296-
//extract coordinates
297-
for (int i = 0; i < len; i++)
298-
{
299-
var coords = nonzeroCoords[i];
300-
for (int axis = 0; axis < ndim; axis++)
301-
{
302-
addresses[axis][i] = coords[axis];
303-
}
304-
};
305-
306-
return ret;
76+
// Strided path for non-contiguous arrays (transposed, sliced, etc.)
77+
// Uses coordinate-based iteration via ILKernelGenerator
78+
return kp.FindNonZeroStrided((T*)x.Address, shape.dimensions, shape.strides, shape.offset);
30779
}
308-
30980
}
31081
}

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