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Increment index within Sweeper.Next function #1

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Increment index within Sweeper.Next function #1

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13 changes: 13 additions & 0 deletions mnist_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -47,3 +47,16 @@ func TestLoad(t *testing.T) {
}
println(train.Count(), test.Count())
}

func TestSweeperNext(t *testing.T) {
train, _, err := Load("./data")
if err != nil {
t.Fatalf("load (%s)", err)
}
sweeper := train.Sweep()
var currentIndex = sweeper.i
sweeper.Next()
if currentIndex == sweeper.i {
t.Errorf("Next does not increase index")
}
}
6 changes: 4 additions & 2 deletions util.go
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Original file line number Diff line number Diff line change
Expand Up @@ -57,10 +57,12 @@ type Sweeper struct {
// Next returns the next image and its label in the data set.
// If the end is reached, present is set to false.
func (sw *Sweeper) Next() (image RawImage, label Label, present bool) {
if sw.i >= len(sw.set.Images) {
var prevIndex = sw.i
sw.i += 1
if prevIndex >= len(sw.set.Images) {
return nil, 0, false
}
return sw.set.Images[sw.i], sw.set.Labels[sw.i], true
return sw.set.Images[prevIndex], sw.set.Labels[prevIndex], true
}

// Sweep creates a new sweep iterator over the data set
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