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|
package main
import (
"fmt"
"io"
"text/template"
)
const checkNativeSelectable = `func checkNativeSelectable(t *Dense, axis int, dt Dtype) error {
if !t.IsNativelyAccessible() {
return errors.New("Cannot select on non-natively accessible data")
}
if axis >= t.Shape().Dims() && !(t.IsScalar() && axis == 0) {
return errors.Errorf("Cannot select on axis %d. Shape is %v", axis, t.Shape())
}
if t.F() || t.RequiresIterator() {
return errors.Errorf("Not yet implemented: native select for colmajor or unpacked matrices")
}
if t.Dtype() != dt {
return errors.Errorf("Native selection only works on %v. Got %v", dt, t.Dtype())
}
return nil
}
`
const nativeSelectRaw = `// Select{{short .}} creates a slice of flat data types. See Example of NativeSelectF64.
func Select{{short .}}(t *Dense, axis int) (retVal [][]{{asType .}}, err error) {
if err := checkNativeSelectable(t, axis, {{reflectKind .}}); err != nil {
return nil, err
}
switch t.Shape().Dims() {
case 0, 1:
retVal = make([][]{{asType .}}, 1)
retVal[0] = t.{{sliceOf .}}
case 2:
if axis == 0 {
return Matrix{{short .}}(t)
}
fallthrough
default:
// size := t.Shape()[axis]
data := t.{{sliceOf .}}
stride := t.Strides()[axis]
upper := ProdInts(t.Shape()[:axis+1])
retVal = make([][]{{asType .}}, 0, upper)
for i, r := 0, 0; r < upper; i += stride {
s := make([]{{asType .}}, 0)
hdr := (*reflect.SliceHeader)(unsafe.Pointer(&s))
hdr.Data = uintptr(unsafe.Pointer(&data[i]))
hdr.Len = stride
hdr.Cap = stride
retVal = append(retVal, s)
r++
}
return retVal, nil
}
return
}
`
const nativeSelectTestRaw = `func TestSelect{{short .}}(t *testing.T) {
assert := assert.New(t)
var T *Dense
var err error
var x [][]{{asType .}}
T = New(Of({{reflectKind .}}), WithShape(2, 3, 4, 5), )
if x, err = Select{{short .}}(T, 1); err != nil {
t.Fatal(err)
}
assert.Equal(6, len(x))
assert.Equal(20, len(x[0]))
T = New(Of({{reflectKind .}}), WithShape(2, 3, 4, 5), )
if x, err = Select{{short .}}(T, 0); err != nil {
t.Fatal(err)
}
assert.Equal(2, len(x))
assert.Equal(60, len(x[0]))
T = New(Of({{reflectKind .}}), WithShape(2, 3, 4, 5), )
if x, err = Select{{short .}}(T, 3); err != nil {
t.Fatal(err)
}
assert.Equal(120, len(x))
assert.Equal(1, len(x[0]))
T = New(Of({{reflectKind .}}), WithShape(2, 3), )
if x, err = Select{{short .}}(T, 0); err != nil {
t.Fatal(err)
}
assert.Equal(2, len(x))
assert.Equal(3, len(x[0]))
T = New(Of({{reflectKind .}}), WithShape(2, 3), )
if x, err = Select{{short .}}(T, 1); err != nil {
t.Fatal(err)
}
assert.Equal(6, len(x))
assert.Equal(1, len(x[0]))
T = New(FromScalar({{if eq .String "bool" -}}false{{else if eq .String "string" -}}""{{else -}}{{asType .}}(0) {{end -}} ))
if x, err = Select{{short .}}(T, 0); err != nil {
t.Fatal(err)
}
assert.Equal(1, len(x))
assert.Equal(1, len(x[0]))
if _, err = Select{{short .}}(T, 10); err == nil{
t.Fatal("Expected errors")
}
}
`
var (
NativeSelect *template.Template
NativeSelectTest *template.Template
)
func init() {
NativeSelect = template.Must(template.New("NativeSelect").Funcs(funcs).Parse(nativeSelectRaw))
NativeSelectTest = template.Must(template.New("NativeSelectTest").Funcs(funcs).Parse(nativeSelectTestRaw))
}
func generateNativeSelect(f io.Writer, ak Kinds) {
fmt.Fprintf(f, importUnqualifiedTensor)
fmt.Fprintf(f, "%v\n", checkNativeSelectable)
ks := filter(ak.Kinds, isSpecialized)
for _, k := range ks {
fmt.Fprintf(f, "/* Native Select for %v */\n\n", k)
NativeSelect.Execute(f, k)
fmt.Fprint(f, "\n\n")
}
}
func generateNativeSelectTests(f io.Writer, ak Kinds) {
fmt.Fprintf(f, importUnqualifiedTensor)
ks := filter(ak.Kinds, isSpecialized)
for _, k := range ks {
NativeSelectTest.Execute(f, k)
fmt.Fprint(f, "\n\n")
}
}
|
