Check all the conditions that must hold true for the ALS to complete its run successfully.

Note: X' (prime) denotes the transpose

Select one or more:

a. S must square

b. C must be square

c. Product of C and S' must be commutative.

d. C'C must be invertible during all the iterations of the ALS execution

e. S' must be invertible

f. S'S must be invertible during all the iterations of the ALS execution

g. S'S must be invertable ONLY during the initialization phase of the algorithm.

h. S must be initialized with the row means of R

i. C must be invertible

j. R can be initialized with any random numbers