We can access the scalar element aijaij of a matrix AA in :eqref:

`eq_matrix_def`

by specifying the indices for the row (ii) and column (jj), such as [A]ij[A]ij. When the scalar elements of a matrix AA, such as in :eqref:`eq_matrix_def`

what is :eqref: `eq_matrix_def`

here?

Hey @gpk2000, thanks for pointing out the typo. The equation doesn’t render properly, it should mean to be equation 2.3.2.

Here are a few norm examples for the MXNet folks:

Frobenius Norms

[nav] In [51]: np.linalg.norm(np.arange(24))

Out[51]: array(65.75713)

[nav] In [52]: np.sqrt(np.sum(np.arange(24)**2))

Out[52]: array(65.757126)

L1 Norm

[ins] In [50]: np.linalg.norm(np.arange(24), ord=1)

Out[50]: array(276.)

I don’t know where I am supposed to start thinking from to answer question 7, can someone give me some pointers?

If you look on google maps at how manhattan streets are laid out (in a grid shape) i think you’ll understand the question better.