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kandi X-RAY | stan Summary
kandi X-RAY | stan Summary
Stan is a C++ package providing. It is built on top of the Stan Math library, which provides. There are interfaces available in R, Python, MATLAB, Julia, Stata, Mathematica, and for the command line.
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QUESTION
I'm trying to install the package brms
in R so that I can rename the parameters returned from the function stan
(from the rstan
package). When I try install.package("brms", dependencies=TRUE)
, I get the (partial) output pasted at the end of this post (it's too long to paste the whole thing). At the end of the output, you can see that I get a series of "dependency errors", which makes sense because the very first error is not a dependency error, but rather a compilation error that says:
ANSWER
Answered 2022-Apr-16 at 17:24Start with
QUESTION
I used Nats Streaming before for my microservices based on Docker and Kubernetes and node.js but because Nats Streaming is currently being deprecated I want to migrate to NATS and NATS JetStream.
This is the deployment yaml config file that I used for NATS Streaming server in my k8s folder which is using by skaffold to apply and it works fine:
...ANSWER
Answered 2021-Dec-02 at 11:14After some trials and errors and some research, I realized that it is actually better to use Helm (Kubernetes package manager) to have a complete and correct manifest for things like NATS or Kafka or ElasticSearch, etc... So, after installing Helm Kubernetes package manager you can install NATS in your Kubernetes cluster by running a command as simple as "helm install my-nats nats/nats
" and then you have NATS up and running there in your Kubernetes.
But in this case with the manifest I came up with for NATS unlike before that it was common to connect to NATS server from node.js client using localhost
and external access was possible, you can connect to NATS server from node.js client by using service name like this, that is perhaps even more appropriate:
QUESTION
I'm trying to get the lyrics as a response to this simple lyrics request (of an Eminem song for example) , it doesn't give me any errors but I don't understand why I'm not getting the response. What am i missing? Please help me :)
...ANSWER
Answered 2022-Mar-17 at 00:13As Phil Mentioned, Edit your code to this and you'll be fine
QUESTION
I am using R+stan
for Bayesian estimates
of model parameters when the distribution for response variable in a regression is not normal but rather some custom distribution as below.
Let say I have below data generating process
...ANSWER
Answered 2022-Mar-11 at 18:24The problem is not so much that the distribution of errors isn't normal (which is the assumption in a regular linear regression), but that that's clearly not a linear relationship between x and y. You DO have a linear relationship with normally distributed noise (z = x * 10 + noise
, where I use z
to avoid confusion with your y
), but then you apply the softmax function: y = softmax(z)
. If you want to model this using a linear regression, you need to invert the softmax (i.e. get the z
back from y
), which you do using the inverse softmax (which is the logit function since the softmax is the inverse logit function and the inverse inverse logit is the logit). Then you can do a standard linear regression.
QUESTION
I have three tables, two of which are relevant for this question. Users, Things, User_to_thing
Users
...ANSWER
Answered 2022-Feb-24 at 23:15It looks like the following should work for you, grouping to remove duplicates and ordering based on null
QUESTION
I am using the functions defined here: Extreme value analysis and user defined probability functions in Stan for modeling the data with a generalized pareto distribution, but my problem is that my model is in a for-loop and expects three real valued arguments, whereas, the gpd functions assume a vector, real, real argument.
I’m not so sure that my model chunk is so amenable to being vectorized, and so I was thinking I would need to have the gpd functions take in real valued arguments (but maybe I’m wrong).
I’d appreciate any help with switching the code around to achieve this. Here is my stan code
...ANSWER
Answered 2022-Feb-22 at 22:25Here is how the log PDF could be adapted. This way, index arrays for subsetting y
into censored and non-censored observations can be passed.
QUESTION
I am getting the following error in my Stan code:
...ANSWER
Answered 2022-Feb-14 at 19:35Your code in the likelihood
section of the model
block doesn't match the way you have defined the gpareto...()
functions in the functions
block. The gpareto
functions take a vector as the first argument but instead you are looping through and trying to pass a single element of value
each time. That's why you get the error that the data types you are passing to gpareto_lcdf()
do not match the "signature" of the function. The function expects the first argument to be a vector
, the second to be a real
, and the third to be a real
. But you are passing three real
s.
The error has nothing to do with sigma
. The ^
symbol is pointing to the entire function call to gpareto_lcdf()
and just happens to be pointing near where the word sigma
is, but the error isn't related to sigma
.
To fix this error, you would need to do one of the following:
- Redefine the
gpareto()
functions to take threereal
arguments and keep your loop in themodel
block as is. - Rewrite your
model
block to not use a loop and instead be vectorized.
I'm not sure the vectorization will work with the condition you have in the model
block so you may be forced to go with the first solution.
I would recommend posting this question on the Stan forum where you may get a better answer.
QUESTION
I am a beginner using stan (and stackoverflow by the way, I have absolutely no idea how you pretty print a dataframe on it, could not find how, sorry).
Let's say I want to make the following model :
...ANSWER
Answered 2022-Feb-07 at 07:48The "trick" seems to indicate in a vector ("indices" here) which value of P to take (1,1,1,1,1,...2,2,2,2,2,...,3,3,3,3,3) and then to loop over it in the parameters to assign the correct value :
QUESTION
I have to consume the following API (bacically i have to subscribe for subject/channel/topic in Stan):
...ANSWER
Answered 2022-Jan-28 at 14:36i would like to convert EAP pattern to TAP pattern.
That would work, if the API was written with the EAP pattern. But it's not. Instead, it's doing its own kind of subscription pattern, using a delegate to trigger updates.
So, your options are:
- Map the custom subscription pattern into a standard Observable pattern.
- Build a buffer (e.g., System.Threading.Channels), have the event handler add items to the buffer, and then consume them as an asynchronous stream.
With both of these options, be sure to handle the "unsubscription" logic as well.
QUESTION
Example of book that I want to delete from the books_library (depends on the book name (input)):
{'Books': [{"Book's ID": {'001'}, "Book's Name": {'Avengers'}, "Book's Authors": {'Stan Lee'}, "Book's Published year": {'1938'}, "Book's Type": {'1'}, "Book's Copies": {'10'}}, {"Book's ID": {'002'}, "Book's Name": {'Spider Man'}, "Book's Authors": {'Stan Lee'}, "Book's Published year": {'1948'}, "Book's Type": {'2'}, "Book's Copies": {'15'}}]}
...The function i'm using:
ANSWER
Answered 2021-Dec-22 at 22:49Try to replace:
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