问题描述
我正在尝试使用R包神经网络训练用于预测流失的神经网络.这是代码:
I am trying to train a neural network for churn prediction with R package neuralnet. Here is the code:
data <- read.csv('C:/PredictChurn.csv')
maxs <- apply(data, 2, max)
mins <- apply(data, 2, min)
scaled_temp <- as.data.frame(scale(data, center = mins, scale = maxs - mins))
scaled <- data
scaled[, -c(1)] <- scaled_temp[, -c(1)]
index <- sample(1:nrow(data),round(0.75*nrow(data)))
train_ <- scaled[index,]
test_ <- scaled[-index,]
library(neuralnet)
n <- names(train_[, -c(1)])
f <- as.formula(paste("CHURNED_F ~", paste(n[!n %in% "CHURNED_F"], collapse = " + ")))
nn <- neuralnet(f,data=train_,hidden=c(5),linear.output=F)
它可以正常工作，但是当使用完整的数据集(数百万行的范围)进行训练时，它花费的时间太长.所以我知道R默认情况下是单线程的，所以我尝试研究如何将工作并行化到所有内核中.甚至可以并行执行此功能吗?我尝试过各种包装，但都没有成功.
It works as it should, however when training with the full data set (in the range of millions of rows) it just takes too long. So I know R is by default single threaded, so I have tried researching on how to parallelize the work into all the cores. Is it even possible to make this function in parallel? I have tried various packages with no success.
有人能做到这一点吗?它不一定是Neuronet软件包，任何可以让我训练神经网络的解决方案都可以使用.
Has anyone been able to do this?It doesn't have to be the neuralnet package, any solution that lets me train a neural network would work.
谢谢
推荐答案
我对 Rmpi ，它也可能适用于您的情况.
I have had good experiences with the package Rmpi, and it may be applicable in your case too.
library(Rmpi)
简而言之，其用法如下:
Briefly, its usage is as follows:
nproc = 4 # could be automatically determined
# Specify one master and nproc-1 slaves
Rmpi:: mpi.spawn.Rslaves(nslaves=nproc-1)
# Execute function "func_to_be_parallelized" on multiple CPUs; pass two variables to function
my_fast_results = Rmpi::mpi.parLapply(var1_passed_to_func,
func_to_be_parallelized,
var2_passed_to_func)
# Close slaves
Rmpi::mpi.close.Rslaves(dellog=T)
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