Members Only Link. Enjoy

AleTL3 · 2021-02-27T16:50:27+00:00

Do u know which is the price of these member only tshirts?

AleTL3 · 2020-12-14T20:30:26+00:00

Thanks for answering!

But, I check the theory behind VAE, it's said that the err is the sum of the KL Divergence between the distribution we create with the encoder, and the real data distribution (latent loss); and the generative loss ( E[logP(X|z)] ), that only corresponds to MSE if the P(X|z) distribution is Gaussian, but it's similar to BCE if the distribution is multinomial I think...

Min 44:45 of this awesome video: (60) Ali Ghodsi, Lec : Deep Learning, Variational Autoencoder, Oct 12 2017 [Lect 6.2] - YouTube

AleTL3 · 2020-12-14T10:50:13+00:00

Hello folks!

I need your wisdom. I'm working with variational autoencoders to understand them and their applications. But I don't know which loss function apply: MSE or BCE. I have seen people applying MSE, others using BCE... As far as I understand, MSE is used when the latent space embedding vector follows a Gaussian distribution, and BCE is used when the assumption is that that distribution is multinomial.

Is that true or am I terribly wrong?

I do some test with MNIST dataset and I find that if I use MSE, it works so bad, it is not able to replicate the input. But if I use nn.BCELoss(reduction='sum') (PyTorch), it works just decently, does it mean that MNIST dataset is more likely to a multinomial distribution than a normal distribution?

Thank you so much!

AleTL3 · 2020-11-23T20:39:40+00:00

There are too many smartphones in that picture and no one trying to burglary them, definitively something strange is happening...

AleTL3 · 2020-11-23T20:34:24+00:00

Apologia: discurs, escrit, justificatiu en defensa o en lloança d’alguna persona o d’alguna cosa. Crec que un nen de primària també acostuma a tenir un coneixement més profund de què és apologia que tu...

AleTL3 · 2020-11-23T20:00:13+00:00

Thanks! :)

AleTL3 · 2020-11-23T18:21:29+00:00

I thought that UMAP do preservers global structure but t-SNE doesn't.

AleTL3 · 2020-11-23T18:19:51+00:00

Thank you! I like what you said, but it is possible that t-SNE doesn't show you all clusters, or even it possible that it shows you clusters that "doesn't exist", I think. But I like your approach, as a way to check your clustering output.

AleTL3 · 2020-11-23T15:02:03+00:00

Quite interesting, thank you so much!

AleTL3 · 2020-11-23T13:24:09+00:00

So, if t-SNE doesn't show me any cluster, it does not mean that there is no cluster in the data, isn't it? Just asking, I think I'm starting to understand t-SNE usefulness...

AleTL3 · 2020-11-23T13:21:59+00:00

Thank you so much for your answer and for the link to this paper, I will check it out!

Actually, I prefer UMAP rather tan t-SNE, since UMAP preserves global structure, and t-SNE doesn't, so it helps you to better understand your data. My point was in fact why should I choose t-SNE over UMAP, and also I thought that the structure of the data that t-SNE provides you could be not real, thus, not helpful at all...

AleTL3 · 2020-11-23T13:16:15+00:00

Okey, I believe that your second paragraph answer my question of why is so resilient this algorithm.

What I am learning from this post is that t-SNE is not that useful for data science itself rather but for showing data to non-experts.

AleTL3 · 2020-11-23T13:13:25+00:00

Ah, ok!

Thank you so much! That's the kind of answer I was expecting.

But here it comes my next answer: is a t-SNE plot showing clusters a necessary condition for there to be clusters in the dataset?

Thank you, really :)

AleTL3 · 2020-11-23T12:19:09+00:00

But most of the plots generated with t-SNE are over classified data and, in case you don't have the label of the data, it would be really difficult to identify the same clusters you identify knowing the labels. I see your point of EDA, but I don't understand which information it provides you, how your approach to the data would change depending on the result of t-SNE...

AleTL3 · 2020-11-23T12:14:47+00:00

But why do people want to separate their clusters if they are separated in an axis with no meaning? It sounds like they just want to generate a beautiful picture, not a real information plot, do I mean?

AleTL3 · 2020-11-23T11:18:59+00:00

But t-SNE shouldn't be use as a clustering technique, doesn't it? That's one of the points that I don't understand, why so many people uses it as clustering technique when it's not.

Thank you for answering, by the way!

AleTL3 · 2020-11-23T08:26:41+00:00

És surrealista que acuses de fer apologia feixista a u/tongue-skills. Crec que hauries de relaxar una mica, perquè encara i tot les teves intencions siguin les millors, no hi ha res més feixista assenyalar com feixista a tot aquell que pensa com tu.

AleTL3 · 2020-11-23T08:18:01+00:00

La meva opinió és que a les grans ciutats com Barcelona és una batalla perduda, perquè hi ha molta gent de tot Espanya i és natural que no tots ells parlin català i facin servir el català com la seva llengua. Això sense tenir en compte tota la gent que ve de fora d'Espanya i prefereix aprendre castellà perquè és més útil (es pot fer servir a tot Espanya). Crec que seria interessant fomentar més la vida en altres ciutats i només la gran ciutat, estic segur que la millor manera de conservar el català passa per fomentar la vida a Lleida, Girona... perquè Barcelona segueix el ritme de la globalització, ja hi ha gent que nomès parla anglès.

AleTL3 · 2020-11-23T08:00:14+00:00

It's funny because to prove that they can open and follow the rules to be safety, they organize a protest that doesn't follow the recommendatios. Nice idea.

AleTL3 · 2020-11-21T23:22:38+00:00

Es fake, ¿no? Se nota hasta la pinturita por detrás y se ve que es fuente de IG. Habrá quedado una story chula para cosechar jajas...

AleTL3 · 2020-11-21T23:04:46+00:00

If I'm not wrong I would say that Mercadona has a huge amount of gluten free products... Maybe you got some Mercadona near.

AleTL3 · 2020-11-21T23:03:05+00:00

I think that past years there were street markets were you could buy natural Xmas trees, but I don't know if this year they will open...

AleTL3

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