Fix#57

.travis.yml

@@ -7,6 +7,7 @@ branches:
 go:
   - 1.13.x
   - 1.14.x
+  - 1.15.x
   - tip
 
 env:

defaultengine_matop_misc.go

@@ -291,6 +291,7 @@ func (e StdEng) denseConcat(a DenseTensor, axis int, Ts []DenseTensor) (DenseTen
 			return nil, errors.Wrap(err, "Unable to slice DenseTensor while performing denseConcat")
 		}
 
+		// keep dims after slicing
 		switch {
 		case v.IsVector() && T.IsMatrix() && axis == 0:
 			v.reshape(v.shape[0], 1)
@@ -320,6 +321,10 @@ func (e StdEng) denseConcat(a DenseTensor, axis int, Ts []DenseTensor) (DenseTen
 				}
 				v.shape = newShape
 				v.strides = newStrides
+			} else if T.Shape()[axis] == 1 {
+				if err := v.unsqueeze(axis); err != nil {
+					return nil, errors.Wrapf(err, "Unable to keep dims after slicing a shape %v on axis %d where the size is 1", T.Shape(), axis)
+				}
 			}
 		}
 

dense.go

@@ -79,7 +79,6 @@ func (t *Dense) addMask(mask []bool) {
 }
 
 func (t *Dense) makeArray(size int) {
-
 	switch te := t.e.(type) {
 	case NonStdEngine:
 		t.flag = MakeMemoryFlag(t.flag, ManuallyManaged)
@@ -99,7 +98,6 @@ func (t *Dense) makeArray(size int) {
 	t.array.C = size
 	t.array.fix()
 	return
-
 }
 
 // Info returns the access pattern which explains how the data in the underlying array is accessed. This is mostly used for debugging.
@@ -158,6 +156,20 @@ func (t *Dense) reshape(dims ...int) error {
 	return t.sanity()
 }
 
+func (t *Dense) unsqueeze(axis int) error {
+	if axis > t.shape.Dims()+1 {
+		return errors.Errorf("Cannot unsqueeze on axis %d when the tensor has shape %v", axis, t.shape)
+	}
+	t.shape = append(t.shape, 1)
+	copy(t.shape[axis+1:], t.shape[axis:])
+	t.shape[axis] = 1
+
+	t.strides = append(t.strides, 1)
+	copy(t.strides[axis+1:], t.strides[axis:])
+
+	return nil
+}
+
 // ScalarValue returns the scalar value of a *Tensor,
 // IF and ONLY IF it's a Tensor representation of a scalar value.
 // This is required because operations like a (vec · vec) would return a scalar value.

dense_assign.go

@@ -1,6 +1,8 @@
 package tensor
 
-import "github.com/pkg/errors"
+import (
+	"github.com/pkg/errors"
+)
 
 func overlaps(a, b DenseTensor) bool {
 	if a.cap() == 0 || b.cap() == 0 {

dense_matop.go

@@ -1,6 +1,8 @@
 package tensor
 
-import "github.com/pkg/errors"
+import (
+	"github.com/pkg/errors"
+)
 
 // T performs a thunked transpose. It doesn't actually do anything, except store extra information about the post-transposed shapes and strides
 // Usually this is more than enough, as BLAS will handle the rest of the transpose

dense_matop_test.go

@@ -741,7 +741,7 @@ var concatTests = []struct {
 
 	{"3tensor; axis 0", Float64, nil, nil, Shape{2, 3, 2}, Shape{1, 3, 2}, 0, Shape{3, 3, 2}, []float64{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 0, 1, 2, 3, 4, 5}},
 	{"3tensor; axis 2", Float64, nil, nil, Shape{2, 3, 2}, Shape{2, 3, 1}, 2, Shape{2, 3, 3}, []float64{0, 1, 0, 2, 3, 1, 4, 5, 2, 6, 7, 3, 8, 9, 4, 10, 11, 5}},
-	// {"3tensor; axis 1", Float64, nil, nil, Shape{2, 3, 2}, Shape{2, 1, 2}, 1, Shape{2, 4, 2}, []float64{222}},
+	{"3tensor; axis 1", Float64, nil, nil, Shape{2, 3, 2}, Shape{2, 1, 2}, 1, Shape{2, 4, 2}, []float64{0, 1, 2, 3, 4, 5, 0, 1, 6, 7, 8, 9, 10, 11, 2, 3}},
 }
 
 func TestDense_Concat(t *testing.T) {
@@ -772,6 +772,7 @@ func TestDense_Concat(t *testing.T) {
 			t.Errorf("Test %v failed: %v", cts.name, err)
 			continue
 		}
+
 		assert.True(cts.correctShape.Eq(T2.Shape()))
 		assert.Equal(cts.correctData, T2.Data())
 	}

dense_test.go

@@ -95,3 +95,46 @@ func Test_recycledDense(t *testing.T) {
 	assert.Equal(t, StdEng{}, T.e)
 	assert.Equal(t, StdEng{}, T.oe)
 }
+
+func TestDense_unsqueeze(t *testing.T) {
+	assert := assert.New(t)
+	T := New(WithShape(3, 3, 2), WithBacking([]float64{
+		1, 2, 3, 4, 5, 6,
+		60, 50, 40, 30, 20, 10,
+		100, 200, 300, 400, 500, 600,
+	}))
+
+	if err := T.unsqueeze(0); err != nil {
+		t.Fatal(err)
+	}
+
+	assert.True(T.Shape().Eq(Shape{1, 3, 3, 2}))
+	assert.Equal([]int{6, 6, 2, 1}, T.Strides()) // if you do shapes.CalcStrides() it'd be {18,6,2,1}
+
+	// reset
+	T.Reshape(3, 3, 2)
+
+	if err := T.unsqueeze(1); err != nil {
+		t.Fatal(err)
+	}
+	assert.True(T.Shape().Eq(Shape{3, 1, 3, 2}))
+	assert.Equal([]int{6, 2, 2, 1}, T.Strides())
+
+	// reset
+	T.Reshape(3, 3, 2)
+	if err := T.unsqueeze(2); err != nil {
+		t.Fatal(err)
+	}
+	t.Logf("%v", T)
+	assert.True(T.Shape().Eq(Shape{3, 3, 1, 2}))
+	assert.Equal([]int{6, 2, 1, 1}, T.Strides())
+
+	// reset
+	T.Reshape(3, 3, 2)
+	if err := T.unsqueeze(3); err != nil {
+		t.Fatal(err)
+	}
+	t.Logf("%v", T)
+	assert.True(T.Shape().Eq(Shape{3, 3, 2, 1}))
+	assert.Equal([]int{6, 2, 1, 1}, T.Strides())
+}

go.mod

@@ -3,16 +3,16 @@ module gorgonia.org/tensor
 go 1.13
 
 require (
-	github.com/apache/arrow/go/arrow v0.0.0-20200909005831-30143fc493df
+	github.com/apache/arrow/go/arrow v0.0.0-20201027203332-c3091dd3f8ca
 	github.com/chewxy/hm v1.0.0
 	github.com/chewxy/math32 v1.0.6
-	github.com/gogo/protobuf v1.3.0
-	github.com/golang/protobuf v1.3.2
+	github.com/gogo/protobuf v1.3.1
+	github.com/golang/protobuf v1.4.2
 	github.com/google/flatbuffers v1.11.0
 	github.com/pkg/errors v0.9.1
 	github.com/stretchr/testify v1.6.0
 	github.com/xtgo/set v1.0.0 // indirect
-	gonum.org/v1/gonum v0.7.0
+	gonum.org/v1/gonum v0.8.1
 	gorgonia.org/vecf32 v0.9.0
 	gorgonia.org/vecf64 v0.9.0
 )

go.sum

@@ -1,51 +1,135 @@
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-github.com/apache/arrow/go/arrow v0.0.0-20200909005831-30143fc493df/go.mod h1:QNYViu/X0HXDHw7m3KXzWSVXIbfUvJqBFe6Gj8/pYA0=
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 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
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@@ -54,4 +138,6 @@ gorgonia.org/vecf32 v0.9.0 h1:PClazic1r+JVJ1dEzRXgeiVl4g1/Hf/w+wUSqnco1Xg=
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 gorgonia.org/vecf64 v0.9.0/go.mod h1:hp7IOWCnRiVQKON73kkC/AUMtEXyf9kGlVrtPQ9ccVA=
+honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 rsc.io/pdf v0.1.1/go.mod h1:n8OzWcQ6Sp37PL01nO98y4iUCRdTGarVfzxY20ICaU4=

known_issues_test.go

@@ -139,7 +139,6 @@ var ltoiTestCases = []struct {
 }
 
 func TestIssue90(t *testing.T) {
-
 	for i, c := range ltoiTestCases {
 		at, err := Ltoi(c.shape, c.strides, c.coordinates...)
 		if !checkErr(t, c.willErr, err, c.name, i) {