# 31 Questions

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### Gradient of dot product which contains l1-norm

Apr 6 '18 at 11:48 Jan 271

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27
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### How a constant is derived from equation in Kullback-Liebler divergence

Aug 15 at 2:22 Pang 373

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### Expression for maximum column index of every row in matrix

Jan 17 '19 at 21:03 EdOverflow 285
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144
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56
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### What does it mean for all norms are elementwise over matrix entries

Apr 9 '18 at 7:12 Jan 271

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161
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37
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### Why does introducing weight to matrix product $W_{ik}H_{kj}$ need to write the weight in three dimensions ($\pi_{ijk}$)?

Aug 17 '17 at 12:06 Jan 271
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1k
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1
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68
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65
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### Math expression for indices of non-zero values from a matrix column

Apr 7 at 5:49 J.-E. Pin 26.4k

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23
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### How to proof $\sum_{l}A_l\sum_{k}B_{lk}C_{ik}D_{kj} = \sum_{k}(\sum_{l}A_lB_{lk})C_{ik}D_{kj}$?

Sep 12 '18 at 9:18 Jan 271

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47
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### Is $\sum\limits_k \frac{W_{ik} H_{kj}}{\sum\limits_k W_{ik} H_{kj}}$ = 1?

Sep 10 '18 at 20:19 Did 259k
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67
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### How to introduce weights for Jensen's inequality into $log\sum\sum$

Aug 28 '18 at 2:23 Jan 271
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179
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81
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25
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### Why is $Ω(H) ≤ Ω(\hat{H}) + \langle ∇Ω(\hat{H}), H − \hat{H} \rangle$ true?

Jun 26 '18 at 12:27 Jan 271

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### If algorithm is derived from majorization-minimization, is it correct to measure error from the majorized form?

Mar 25 '18 at 14:24 Jan 271

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42
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71
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78
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56
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### What does Proof. “function 1 = function 2 is trivially met” mean?

Aug 14 '17 at 7:06 Jan 271

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56
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### What do the (+) and (-) operators after the divergence symbol ($\nabla$) mean?

Aug 9 '17 at 11:41 Jan 271

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165
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45
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### What is the $\boldsymbol{l_{1,q}}$ norm (with comma)?

Jun 20 '17 at 14:11 MPW 36k

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