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"fix Sweeper.next, add Raw Image AtGray" #3

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5 changes: 5 additions & 0 deletions mnist.go
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Original file line number Diff line number Diff line change
Expand Up @@ -49,6 +49,11 @@ func (img RawImage) At(x, y int) color.Color {
return color.Gray{img[y*Width+x]}
}

func (img RawImage) AtGray(x, y int) color.Gray {
return color.Gray{img[y*Width+x]}
}


// ReadImageFile opens the named image file (training or test), parses it and
// returns all images in order.
func ReadImageFile(name string) (rows, cols int, imgs []RawImage, err error) {
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3 changes: 2 additions & 1 deletion util.go
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Original file line number Diff line number Diff line change
Expand Up @@ -57,6 +57,7 @@ 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) {
sw.i++
if sw.i >= len(sw.set.Images) {
return nil, 0, false
}
Expand All @@ -65,7 +66,7 @@ func (sw *Sweeper) Next() (image RawImage, label Label, present bool) {

// Sweep creates a new sweep iterator over the data set
func (s *Set) Sweep() *Sweeper {
return &Sweeper{set: s}
return &Sweeper{set: s, i: -1}
}

// Load reads both the training and the testing MNIST data sets, given
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