Transf: matrix

[Laurent MICHEL]

Dear,

Comment #3:

- The matrix operation class (Matrix) seems to refer to a 2D matrix. The 
class could be renamed Matrix2D to keep room for future high 
dimensionality classes

- The matrix dimensions are named N and M. Personally, I'm pretty sure 
to always confuse N.M and M.N. It could be safer to renamed these 
attributes with something more expressive like (row, columns)

LM
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