Using OpenCPU to access custom R function

问题

I have an R code which loads the RandomForest model, I am looking to create a function which

load(model)
randomforest_func = function(data) 
{
  data$pred = predict(model,data,type="prob")
  output = data.frame(data$customerid,data$pred[,2])
  return(output)
 }

I need to make this function enabled in webserver, where an external application feeds data and retrieves the output.

The problem is, the model needs to be preloaded and cannot load into R env for each request.

The function needs to support parallel connections.

I tried installing opencpu in R.

The above code should be running in R and available at http://localhost:1234/ocpu/

I now made changes to the opencpu.js to point to this URL and used the function in jquery to below. ocpu.r_fun_call("randomforest_func",parameters)

However this is seems to be not working..

ocpu.r_fun_call does not seem to be accessing the R script.

My question is how to correctly configure the opencpu to be able access the randomforest_func

回答1:

This should help with deploying it as an app, making it easier for any external application to consume the services.

This should help with including the model.

回答2:

The above code should be running in R and available at http://localhost:1234/ocpu/

No. You need to create a package in which you put your custom functions. If the package is called foo, then the app will be available at

http://localhost:xxxx/ocpu/library/foo/www

(where xxxx is a random value for the port, given when you run opencpu$browse()). Also, you have to use ocpu.call, not ocpu.r_fun_call.

来源：https://stackoverflow.com/questions/35501293/using-opencpu-to-access-custom-r-function

标签

javascript

api

opencpu