remove linear.bias init when not required

nn/linear.go

@@ -6,7 +6,6 @@ import (
 	"fmt"
 	"math"
 
-	"github.com/sugarme/gotch"
 	"github.com/sugarme/gotch/ts"
 )
 
@@ -40,15 +39,8 @@ type Linear struct {
 // outDim - output dimension (y) [output features - columns]
 // NOTE: w will have shape{outDim, inDim}; b will have shape{outDim}
 func NewLinear(vs *Path, inDim, outDim int64, c *LinearConfig) *Linear {
-	dtype := gotch.DefaultDType
 	var bs *ts.Tensor
-	// bs has size of output dimension
-	switch c.Bias {
-	case false:
-		// FIXME. do we need this? or just remove it and in the `Forward` creating on-fly
-		// with same dtype and device to the input.
-		bs = ts.MustZeros([]int64{outDim}, dtype, vs.Device())
-	case true:
+	if c.Bias {
 		switch {
 		case c.BsInit == nil:
 			shape := []int64{inDim, outDim}