-
Notifications
You must be signed in to change notification settings - Fork 1
/
array.go
227 lines (206 loc) · 4.78 KB
/
array.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
package num
import (
"fmt"
"unsafe"
"github.com/jnb666/deepthought2/num/cuda"
"github.com/jnb666/deepthought2/num/mkl"
)
// Parameters for array printing
var (
PrintThreshold = 12
PrintEdgeitems = 4
)
// Buffer interface type represents the underlying data for an array
type Buffer interface {
// pointer to data
Data() unsafe.Pointer
// size of buffer in 32 bit words
Capacity() int
// release frees the memory
Release()
}
func (d cpuDevice) NewBuffer(size int) Buffer {
return mkl.NewBuffer(size)
}
func (d gpuDevice) NewBuffer(size int) Buffer {
return cuda.NewBuffer(size)
}
// Allocate a new array using the provided buffer
func NewArray(buf Buffer, dtype DataType, dims ...int) *Array {
size := Prod(dims)
if size > buf.Capacity() {
panic(fmt.Errorf("NewArray: buffer is too small size=%d capacity=%d\n", size, buf.Capacity()))
}
return &Array{Buffer: buf, Dtype: dtype, Dims: dims}
}
// Array struct is a general n dimensional tensor similar to a numpy ndarray
// data is stored internally in column major order, may be either on CPU or on GPU depending on buffer type
type Array struct {
Buffer
Dtype DataType
Dims []int
}
// Size of data in array in words
func (a *Array) Size() int {
return Prod(a.Dims)
}
// Reshape returns a new array of the same size with a view on the same data but with a different shape
func (a *Array) Reshape(dims ...int) *Array {
n := a.Size()
for i := range dims {
if dims[i] == -1 {
other := 1
for j, dim := range dims {
if i != j {
if dim == -1 {
panic("Reshape: can only have single -1 value")
}
other *= dim
}
}
dims[i] = n / other
}
}
if Prod(dims) != n {
panic("reshape must be to array of same size")
}
return &Array{Buffer: a.Buffer, Dtype: a.Dtype, Dims: dims}
}
// String returns pretty printed output
func (a *Array) String(q Queue) string {
var data interface{}
if a.Dtype == Int32 {
data = make([]int32, a.Size())
} else {
data = make([]float32, a.Size())
}
q.Call(Read(a, data)).Finish()
return format(a.Dims, data, 0, 1, "", false)
}
// array resident in main memory
func (d cpuDevice) NewArray(dtype DataType, dims ...int) *Array {
return NewArray(mkl.NewBuffer(Prod(dims)), dtype, dims...)
}
func (d cpuDevice) NewArrayLike(a *Array) *Array {
return d.NewArray(a.Dtype, a.Dims...)
}
// array resident on GPU
func (d gpuDevice) NewArray(dtype DataType, dims ...int) *Array {
return NewArray(cuda.NewBuffer(Prod(dims)), dtype, dims...)
}
func (d gpuDevice) NewArrayLike(a *Array) *Array {
return d.NewArray(a.Dtype, a.Dims...)
}
func format(dims []int, data interface{}, at, stride int, indent string, dots bool) string {
var s string
switch len(dims) {
case 0:
if dots {
s = " ... "
} else {
switch d := data.(type) {
case []int32:
s = fmt.Sprintf("%5d ", d[at])
case []float32:
val := d[at]
if abs(val) < 1 {
val = float32(int(10000*val+0.5)) / 10000
}
s = fmt.Sprintf("%7.5g ", val)
}
}
case 1:
s = "["
for i := 0; i < dims[0]; i++ {
dots2 := dims[0] > PrintThreshold+1 && i == PrintEdgeitems
s += format([]int{}, data, at+i*stride, 1, "", dots || dots2)
if dots2 {
i = dims[0] - PrintEdgeitems - 1
}
}
s += "]"
case 2:
var pre, post string
for i := 0; i < dims[0]; i++ {
if i == 0 {
pre = "["
} else {
pre = " "
}
if i < dims[0]-1 {
post = "\n"
} else {
post = "]\n"
}
dots := dims[0] > PrintThreshold+1 && i == PrintEdgeitems
s += indent + pre + format(dims[1:], data, at+i, dims[0], "", dots) + post
if dots {
i = dims[0] - PrintEdgeitems - 1
}
}
default:
d := len(dims) - 1
bsize := Prod(dims[:d])
s = indent + "[\n"
for i := 0; i < dims[d]; i++ {
if dims[d] > PrintThreshold+1 && i == PrintEdgeitems {
s += " ... ... \n"
i = dims[d] - PrintEdgeitems - 1
} else {
s += format(dims[:d], data, at+bsize*i, 1, indent+" ", false)
}
}
s += indent + "]\n"
}
return s
}
func abs(x float32) float32 {
if x >= 0 {
return x
}
return -x
}
// Product of elements of an integer array. Zero dimension array (scalar) has size 1.
func Prod(arr []int) int {
prod := 1
for _, v := range arr {
prod *= v
}
return prod
}
// Check if two arrays are the same shape
func SameShape(xd, yd []int) bool {
if len(xd) != len(yd) {
return false
}
for i := range xd {
if xd[i] != yd[i] {
return false
}
}
return true
}
// Total size of one of more arrays in bytes
func Bytes(arr ...*Array) (bytes int) {
for _, a := range arr {
if a != nil {
bytes += 4 * a.Size()
}
}
return bytes
}
// Release one or more arrays or buffers
func Release(arr ...Buffer) {
for _, a := range arr {
switch obj := a.(type) {
case *Array:
if obj != nil {
obj.Release()
}
case mkl.Buffer:
obj.Release()
case cuda.Buffer:
obj.Release()
}
}
}