issues in the nutshell example

[CielAl]

Hi,

I am new to autonn and looking into the demo, and there might be a problem in the example.
By modifying the definition of prediction to :
prediction = w * x' + b ;
instead of

prediction = w * x + b ;

( and change the def of w to w = Param('value', randn(100,1)) ;)

I will be able to run the demo (but then this w*x' produces a square matrix and is nonsense), otherwise, the exception in sum_der (line 229) always occurs.

For the original definition of x and w, the x_sz of line 220 in autonn_der.m is vector [1,1] with only two input arguments, and thus the line 224 would be
dim = find([1,1, 2] ~= 1, 1) ; // which returns 3

Then in line 229,
x_sz(dim) becomes x_sz(3) and it exceeds the max dimension of x_sz.

• The current version of matconvnet is 1.0 -beta 24, while the version of matlab is R2016b.

[CielAl]

PS, for the case:
'{x, rand(100, 2), y, [0.5;0.5]}', it will work.

I assume that is when there are two points in the input.