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dstack.ai

Installation

The dstack package and command line tool must be installed with either pip or Conda:

pip install dstack

or

conda install -c dstack.ai dstack

Note, if you use pip, it is highly recommended to use virtualenv to manage local environment. Of course you need to install R package too:

install.packages("dstack")

Configuration

Before you can use dstack package in your code, you must run the dstack command line tool configure a dstack profile where you specify your dstack.ai username and token.

Configuring dstack profiles separately from your code, allows you to make the code safe and not include plain secret tokens.

Configuring a dstack profile can be done by the following command:

dstack config add --token <TOKEN> --user <USER>

or simply

dstack config add

In this case, the dstack profile name will be default. You can change it by including profile name in your command dstack config add <PROFILE_NAME>. This allows you to configure multiple profiles and refer to them from your code by their names.

By default, the configuration profile is in your home directory: $HOME/.dstack/config.yaml

NOTE

Before CLI version 0.4.2 config was stored in a working directory. Please, do not forget to move the local config into your home directory.

See documentation for more information about command line tools or type dstack --help.

You can also configure dstack by using R console:

dstack::configure(user = "<USER>", token = "<TOKEN>", persist = "global")

How to install dstack server locally

From CLI version 0.4 it is possible to use a local version of dstack server.

To start it, use the following command:

dstack server start

This command installs the latest version (if it’s not installed) of the server and starts it. If environment variable JAVA_HOME is set and version of JDK is compatible with the server, that version will be used. In the case if installer can’t find JAVA_HOME or JDK version is incompatible with current server version it will download a compatible version by itself. To update server use dstack server update.

Follow instructions provided by the server in the terminal.

Use dstack server --help for more information.

Publishing simple plots

Once the dstack profile is configured, you can publish plots from your R code. Let’s consider how to publish simple ggplot2 plot:

library(ggplot2)
library(dstack)

df <- data.frame(x = c(1, 2, 3, 4), y = c(1, 4, 9, 16))
image <- ggplot(data = df, aes(x = x, y = y)) + geom_line()

push_frame("simple", image, "My first plot")

Publishing interactive plots

In some cases, you want to have plots that are interactive and that can change when the user change its parameters. Suppose you want to publish a line plot that depends on the value of the parameter Coefficient (slope).

library(ggplot2)
library(dstack)

line_plot <- function(a) { 
    x <- c(0:20)
    y <- sapply(x, function(x) { return(a * x) })
    df <- data.frame(x = x, y = y)
    plot <- ggplot(data = df, aes(x = x, y = y)) + 
        geom_line() + xlim(0, 20) + ylim(0, 20)
    return(plot)
}

coeff <- c(0.5, 1.0, 1.5, 2.0)
frame <- create_frame(stack = "line_plot")
for(c in coeff) {  
    frame <- commit(frame, line_plot(c), 
        paste0("Line plot with the coefficient of ", c), list(Coefficient = a))
}

push(frame)

Documentation

For more details on the API and code samples, check out the docs.