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TensorFlow.NET/src/TensorFlowNET.Core/NumPy/NDArray.Index.cs at master · ehtick/TensorFlow.NET · GitHub
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NDArray.Index.cs
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TensorFlow.NET
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TensorFlowNET.Core
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NDArray.Index.cs
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using
System
;
using
System
.
Collections
.
Generic
;
using
System
.
Linq
;
using
System
.
Text
;
using
static
Tensorflow
.
Binding
;
namespace
Tensorflow
.
NumPy
{
public
partial
class
NDArray
{
public
NDArray
this
[
params
int
[
]
indices
]
{
get
=>
GetData
(
indices
.
Select
(
x
=>
new
Slice
{
Start
=
x
,
Stop
=
x
+
1
,
IsIndex
=
true
}
)
.
ToArray
(
)
)
;
set
=>
SetData
(
indices
.
Select
(
x
=>
{
if
(
x
<
0
)
x
=
(
int
)
dims
[
0
]
+
x
;
var
slice
=
new
Slice
{
Start
=
x
,
Stop
=
x
+
1
,
IsIndex
=
true
}
;
return
slice
;
}
)
,
value
)
;
}
public
NDArray
this
[
params
Slice
[
]
slices
]
{
get
=>
GetData
(
slices
)
;
set
=>
SetData
(
slices
,
value
)
;
}
public
NDArray
this
[
NDArray
mask
]
{
get
{
if
(
mask
.
dtype
==
TF_DataType
.
TF_BOOL
)
return
GetData
(
enumerate
(
mask
.
ToArray
<
bool
>
(
)
)
.
Where
(
x
=>
x
.
Item2
)
.
Select
(
x
=>
x
.
Item1
)
.
ToArray
(
)
)
;
else
if
(
mask
.
dtype
==
TF_DataType
.
TF_INT32
)
return
GetData
(
mask
.
ToArray
<
int
>
(
)
)
;
else
if
(
mask
.
dtype
==
TF_DataType
.
TF_INT64
)
return
GetData
(
mask
.
ToArray
<
long
>
(
)
.
Select
(
x
=>
Convert
.
ToInt32
(
x
)
)
.
ToArray
(
)
)
;
else
if
(
mask
.
dtype
==
TF_DataType
.
TF_FLOAT
)
return
GetData
(
mask
.
ToArray
<
float
>
(
)
.
Select
(
x
=>
Convert
.
ToInt32
(
x
)
)
.
ToArray
(
)
)
;
throw
new
NotImplementedException
(
""
)
;
}
set
{
if
(
mask
.
dtype
==
TF_DataType
.
TF_BOOL
)
MaskData
(
mask
,
value
)
;
else
throw
new
NotImplementedException
(
""
)
;
}
}
[
AutoNumPy
]
unsafe
NDArray
GetData
(
Slice
[
]
slices
)
{
if
(
shape
.
IsScalar
)
return
GetScalar
(
)
;
if
(
SliceHelper
.
AreAllIndex
(
slices
,
out
var
indices1
)
)
{
var
newshape
=
ShapeHelper
.
GetShape
(
shape
,
slices
)
;
if
(
newshape
.
IsScalar
)
{
var
offset
=
ShapeHelper
.
GetOffset
(
shape
,
indices1
)
;
return
GetScalar
(
(
ulong
)
offset
)
;
}
else
{
return
GetArrayData
(
newshape
,
indices1
)
;
}
}
else
if
(
slices
.
Count
(
)
==
1
)
{
var
slice
=
slices
[
0
]
;
if
(
slice
.
Step
==
1
)
{
var
newshape
=
ShapeHelper
.
GetShape
(
shape
,
slice
)
;
var
array
=
new
NDArray
(
newshape
,
dtype
:
dtype
)
;
var
new_dims
=
new
int
[
shape
.
ndim
]
;
new_dims
[
0
]
=
slice
.
Start
??
0
;
//for (int i = 1; i < shape.ndim; i++)
//new_dims[i] = (int)shape.dims[i];
var
offset
=
ShapeHelper
.
GetOffset
(
shape
,
new_dims
)
;
var
src
=
(
byte
*
)
data
+
(
ulong
)
offset
*
dtypesize
;
var
dst
=
(
byte
*
)
array
.
data
;
var
len
=
(
ulong
)
newshape
.
size
*
dtypesize
;
System
.
Buffer
.
MemoryCopy
(
src
,
dst
,
len
,
len
)
;
return
array
;
}
}
// default, performance is bad
var
tensor
=
base
[
slices
.
ToArray
(
)
]
;
if
(
tensor
.
Handle
==
null
)
{
if
(
tf
.
executing_eagerly
(
)
)
tensor
=
tf
.
get_default_session
(
)
.
eval
(
tensor
)
;
}
return
new
NDArray
(
tensor
,
tf
.
executing_eagerly
(
)
)
;
}
unsafe
T
GetAtIndex
<
T
>
(
params
int
[
]
indices
)
where
T
:
unmanaged
{
var
offset
=
(
ulong
)
ShapeHelper
.
GetOffset
(
shape
,
indices
)
;
return
*
(
(
T
*
)
data
+
offset
)
;
}
unsafe
NDArray
GetScalar
(
ulong
offset
=
0
)
{
var
array
=
new
NDArray
(
Shape
.
Scalar
,
dtype
:
dtype
)
;
var
src
=
(
byte
*
)
data
+
offset
*
dtypesize
;
System
.
Buffer
.
MemoryCopy
(
src
,
array
.
buffer
.
ToPointer
(
)
,
dtypesize
,
dtypesize
)
;
return
array
;
}
unsafe
NDArray
GetArrayData
(
Shape
newshape
,
int
[
]
indices
)
{
var
offset
=
ShapeHelper
.
GetOffset
(
shape
,
indices
)
;
var
len
=
(
ulong
)
newshape
.
size
*
dtypesize
;
var
array
=
new
NDArray
(
newshape
,
dtype
:
dtype
)
;
var
src
=
(
byte
*
)
data
+
(
ulong
)
offset
*
dtypesize
;
System
.
Buffer
.
MemoryCopy
(
src
,
array
.
data
.
ToPointer
(
)
,
len
,
len
)
;
return
array
;
}
unsafe
NDArray
GetData
(
int
[
]
indices
,
int
axis
=
0
)
{
if
(
shape
.
IsScalar
)
return
GetScalar
(
)
;
if
(
axis
==
0
)
{
var
dims
=
shape
.
as_int_list
(
)
;
dims
[
0
]
=
indices
.
Length
;
var
array
=
np
.
ndarray
(
dims
,
dtype
:
dtype
)
;
dims
[
0
]
=
1
;
var
len
=
new
Shape
(
dims
)
.
size
*
dtype
.
get_datatype_size
(
)
;
int
dst_index
=
0
;
foreach
(
var
pos
in
indices
)
{
var
src_offset
=
(
ulong
)
ShapeHelper
.
GetOffset
(
shape
,
pos
)
;
var
dst_offset
=
(
ulong
)
ShapeHelper
.
GetOffset
(
array
.
shape
,
dst_index
++
)
;
var
src
=
(
byte
*
)
data
+
src_offset
*
dtypesize
;
var
dst
=
(
byte
*
)
array
.
data
+
dst_offset
*
dtypesize
;
System
.
Buffer
.
MemoryCopy
(
src
,
dst
,
len
,
len
)
;
}
return
array
;
}
else
throw
new
NotImplementedException
(
""
)
;
}
void
SetData
(
IEnumerable
<
Slice
>
slices
,
NDArray
array
)
=>
SetData
(
array
,
slices
.
ToArray
(
)
,
new
int
[
shape
.
ndim
]
.
ToArray
(
)
,
-
1
)
;
unsafe
void
SetData
(
NDArray
src
,
Slice
[
]
slices
,
int
[
]
indices
,
int
currentNDim
)
{
if
(
dtype
!=
src
.
dtype
)
// src = src.astype(dtype);
throw
new
ArrayTypeMismatchException
(
$
"Required dtype
{
dtype
}
but
{
src
.
dtype
}
is assigned."
)
;
if
(
!
slices
.
Any
(
)
)
return
;
if
(
shape
.
Equals
(
src
.
shape
)
)
{
System
.
Buffer
.
MemoryCopy
(
src
.
data
.
ToPointer
(
)
,
data
.
ToPointer
(
)
,
src
.
bytesize
,
src
.
bytesize
)
;
return
;
}
// first iteration
if
(
currentNDim
==
-
1
)
{
slices
=
SliceHelper
.
AlignWithShape
(
shape
,
slices
)
;
}
// last dimension
if
(
currentNDim
==
ndim
-
1
)
{
var
offset
=
(
int
)
ShapeHelper
.
GetOffset
(
shape
,
indices
)
;
var
dst
=
data
+
offset
*
(
int
)
dtypesize
;
System
.
Buffer
.
MemoryCopy
(
src
.
data
.
ToPointer
(
)
,
dst
.
ToPointer
(
)
,
src
.
bytesize
,
src
.
bytesize
)
;
return
;
}
currentNDim
++
;
var
slice
=
slices
[
currentNDim
]
;
var
start
=
slice
.
Start
??
0
;
var
stop
=
slice
.
Stop
??
(
int
)
dims
[
currentNDim
]
;
var
step
=
slice
.
Step
;
if
(
step
!=
1
)
{
for
(
var
i
=
start
;
i
<
stop
;
i
+=
step
)
{
if
(
i
>=
dims
[
currentNDim
]
)
throw
new
OutOfRangeError
(
$
"Index should be in [0,
{
dims
[
currentNDim
]
}
] but got
{
i
}
"
)
;
indices
[
currentNDim
]
=
i
;
if
(
currentNDim
<
ndim
-
src
.
ndim
)
{
SetData
(
src
,
slices
,
indices
,
currentNDim
)
;
}
else
{
var
srcIndex
=
(
i
-
start
)
/
step
;
SetData
(
src
[
srcIndex
]
,
slices
,
indices
,
currentNDim
)
;
}
}
}
else
{
for
(
var
i
=
start
;
i
<
stop
;
i
++
)
{
if
(
i
>=
dims
[
currentNDim
]
)
throw
new
OutOfRangeError
(
$
"Index should be in [0,
{
dims
[
currentNDim
]
}
] but got
{
i
}
"
)
;
indices
[
currentNDim
]
=
i
;
if
(
currentNDim
<
ndim
-
src
.
ndim
)
{
SetData
(
src
,
slices
,
indices
,
currentNDim
)
;
}
// last dimension
else
if
(
currentNDim
==
ndim
-
1
)
{
SetData
(
src
,
slices
,
indices
,
currentNDim
)
;
break
;
}
else
if
(
SliceHelper
.
IsContinuousBlock
(
slices
,
currentNDim
)
)
{
var
offset
=
(
int
)
ShapeHelper
.
GetOffset
(
shape
,
indices
)
;
var
dst
=
data
+
offset
*
(
int
)
dtypesize
;
System
.
Buffer
.
MemoryCopy
(
src
.
data
.
ToPointer
(
)
,
dst
.
ToPointer
(
)
,
src
.
bytesize
,
src
.
bytesize
)
;
return
;
}
else
{
var
srcIndex
=
i
-
start
;
SetData
(
src
[
srcIndex
]
,
slices
,
indices
,
currentNDim
)
;
}
}
}
// reset indices
indices
[
currentNDim
]
=
0
;
}
unsafe
void
MaskData
(
NDArray
mask
,
NDArray
value
)
{
var
masks
=
mask
.
ToArray
<
bool
>
(
)
;
var
s1
=
new
Shape
(
dims
.
Skip
(
mask
.
rank
)
.
ToArray
(
)
)
;
var
val
=
tf
.
fill
(
s1
,
value
)
.
numpy
(
)
;
for
(
int
i
=
0
;
i
<
masks
.
Length
;
i
++
)
{
if
(
masks
[
i
]
)
this
[
i
]
=
val
;
}
}
}
}
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