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H2O4GPU

Join the chat at https://gitter.im/h2oai/h2o4gpu

H2O4GPU is a collection of GPU solvers by H2Oai with APIs in Python and R. The Python API builds upon the easy-to-use scikit-learn API and its well-tested CPU-based algorithms. It can be used as a drop-in replacement for scikit-learn (i.e. import h2o4gpu as sklearn) with support for GPUs on selected (and ever-growing) algorithms. H2O4GPU inherits all the existing scikit-learn algorithms and falls back to CPU algorithms when the GPU algorithm does not support an important existing scikit-learn class option. The R package is a wrapper around the H2O4GPU Python package, and the interface follows standard R conventions for modeling.

Daal library added for CPU, currently supported only x86_64 architecture.

Requirements

  • PC running Linux with glibc 2.17+

  • Install CUDA with bundled display drivers ( CUDA 8 or CUDA 9 )

When installing, choose to link the cuda install to /usr/local/cuda . Ensure to reboot after installing the new nvidia drivers.

  • Nvidia GPU with Compute Capability >= 3.5 (Capability Lookup).

  • For advanced features, like handling rows/32 > 2^16 (i.e., rows > 2,097,152) in K-means, need Capability >= 5.2

  • For building the R package, libcurl4-openssl-dev, libssl-dev, and libxml2-dev are needed.

User Installation

Note: This installation is for users who download the wheel file and are not expecting to develop the code. See DEVEL.md for developer installation.

Add to ~/.bashrc or environment (set appropriate paths for your OS):

export CUDA_HOME=/usr/local/cuda # or choose /usr/local/cuda9 for cuda9 and /usr/local/cuda8 for cuda8
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$CUDA_HOME/lib64/:$CUDA_HOME/lib/:$CUDA_HOME/extras/CUPTI/lib64
  • Install OpenBlas dev environment:
sudo apt-get install libopenblas-dev pbzip2

If you are building the h2o4gpu R package, it is necessary to install the following dependencies:

sudo apt-get -y install libcurl4-openssl-dev libssl-dev libxml2-dev

Download the Python wheel file (For Python 3.6 on linux_x86_64):

  • Stable:
  • Bleeding edge (changes with every successful master branch build):
  • [For Conda (unsupported and untested by H2O.ai)]
        pip install --extra-index-url https://pypi.anaconda.org/gpuopenanalytics/simple h2o4gpu
    

Start a fresh pyenv or virtualenv session.

Install the Python wheel file. NOTE: If you don't use a fresh environment, this will overwrite your py3nvml and xgboost installations to use our validated versions.

pip install h2o4gpu-0.2.0-cp36-cp36m-linux_x86_64.whl

At this point, you should have installed the H2O4GPU Python package successfully. You can then go ahead and install the h2o4gpu R package via the following:

if (!require(devtools)) install.packages("devtools")
devtools::install_github("h2oai/h2o4gpu", subdir = "src/interface_r")

Detailed instructions can be found here.

Test Installation

To test your installation of the Python package, the following code:

import h2o4gpu
import numpy as np

X = np.array([[1.,1.], [1.,4.], [1.,0.]])
model = h2o4gpu.KMeans(n_clusters=2,random_state=1234).fit(X)
model.cluster_centers_

should give input/output of:

>>> import h2o4gpu
>>> import numpy as np
>>>
>>> X = np.array([[1.,1.], [1.,4.], [1.,0.]])
>>> model = h2o4gpu.KMeans(n_clusters=2,random_state=1234).fit(X)
>>> model.cluster_centers_
array([[ 1.,  1.  ],
       [ 1.,  4.  ]])

To test your installation of the R package, try the following example that builds a simple XGBoost random forest classifier:

library(h2o4gpu)

# Setup dataset
x <- iris[1:4]
y <- as.integer(iris$Species) - 1

# Initialize and train the classifier
model <- h2o4gpu.random_forest_classifier() %>% fit(x, y)

# Make predictions
predictions <- model %>% predict(x)

Next Steps

For more examples using Python API, please check out our Jupyter notebook demos. To run the demos using a local wheel run, at least download src/interface_py/requirements_runtime_demos.txt from the Github repo and do:

pip install -r src/interface_py/requirements_runtime_demos.txt

and then run the jupyter notebook demos.

For more examples using R API, please visit the vignettes.

Running Jupyter Notebooks with Docker

Requirements:

Download the Docker file (for linux_x86_64):

  • Bleeding edge (changes with every successful master branch build):

Load and run docker file (e.g. for bleeding-edge of cuda90):

pbzip2 -dc h2o4gpu-0.2.0.9999-cuda90-runtime.tar.bz2 | nvidia-docker load
mkdir -p log ; nvidia-docker run --name localhost --rm -p 8888:8888 -u `id -u`:`id -g` -v `pwd`/log:/log --entrypoint=./run.sh opsh2oai/h2o4gpu-0.2.0.9999-cuda90-runtime &
find log -name jupyter* -type f -printf '%T@ %p\n' | sort -k1 -n | awk '{print $2}' | tail -1 | xargs cat | grep token | grep http | grep -v NotebookApp

Copy/paste the http link shown into your browser. If the "find" command doesn't work, look for the latest jupyter.log file and look at contents for the http link and token.

If the link shows no token or shows ... for token, try a token of "h2o" (without quotes). If running on your own host, the weblink will look like http://localhost:8888:token with token replaced by the actual token.

This container has a /demos directory which contains Jupyter notebooks and some data.

Plans and RoadMap

The vision is to develop fast GPU algorithms to complement the CPU algorithms in scikit-learn while keeping full scikit-learn API compatibility and scikit-learn CPU algorithm capability. The h2o4gpu Python module is to be used as a drop-in-replacement for scikit-learn that has the full functionality of scikit-learn's CPU algorithms.

Functions and classes will be gradually overridden by GPU-enabled algorithms (unless n_gpu=0 is set and we have no CPU algorithm except scikit-learn's). The CPU algorithms and code initially will be sklearn, but gradually those may be replaced by faster open-source codes like those in Intel DAAL.

This vision is currently accomplished by using the open-source scikit-learn and xgboost and overriding scikit-learn calls with our own GPU versions. In cases when our GPU class is currently incapable of an important scikit-learn feature, we revert to the scikit-learn class.

As noted above, there is an R API in development, which will be released as a stand-alone R package. All algorithms supported by H2O4GPU will be exposed in both Python and R in the future.

Another primary goal is to support all operations on the GPU via the GOAI initiative. This involves ensuring the GPU algorithms can take and return GPU pointers to data instead of going back to the host. In scikit-learn API language these are called fit_ptr, predict_ptr, transform_ptr, etc., where ptr stands for memory pointer.

Alt text

Solver Classes

Among others, the solver can be used for the following classes of problems

  • GLM: Lasso, Ridge Regression, Logistic Regression, Elastic Net Regulariation
  • KMeans
  • Gradient Boosting Machine (GBM) via XGBoost
  • Singular Value Decomposition(SVD) + Truncated Singular Value Decomposition
  • Principal Components Analysis(PCA)

Benchmarks

Our benchmarking plan is to clearly highlight when modeling benefits from the GPU (usually complex models) or does not (e.g. one-shot simple models dominated by data transfer).

We have benchmarked h2o4gpu, scikit-learn, and h2o-3 on a variety of solvers. Some benchmarks have been performed for a few selected cases that highlight the GPU capabilities (i.e. compute or on-GPU memory operations dominate data transfer to GPU from host):

Benchmarks for GLM, KMeans, and XGBoost for CPU vs. GPU.

A suite of benchmarks are computed when doing "make testperf" from a build directory. These take all of our tests and benchmarks h2o4gpu against h2o-3. These will soon be presented as a live commit-by-commit streaming plots on a website.

Contributing

Please refer to our CONTRIBUTING.md and DEVEL.md for instructions on how to build and test the project and how to contribute. The h2o4gpu Gitter chatroom can be used for discussion related to open source development.

GitHub issues are used for bugs, feature and enhancement discussion/tracking.

Questions

References

  1. Parameter Selection and Pre-Conditioning for a Graph Form Solver -- C. Fougner and S. Boyd
  2. Block Splitting for Distributed Optimization -- N. Parikh and S. Boyd
  3. Distributed Optimization and Statistical Learning via the Alternating Direction Method of Multipliers -- S. Boyd, N. Parikh, E. Chu, B. Peleato, and J. Eckstein
  4. Proximal Algorithms -- N. Parikh and S. Boyd

Copyright

Copyright (c) 2017, H2O.ai, Inc., Mountain View, CA
Apache License Version 2.0 (see LICENSE file)


This software is based on original work under BSD-3 license by:

Copyright (c) 2015, Christopher Fougner, Stephen Boyd, Stanford University
All rights reserved.

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      notice, this list of conditions and the following disclaimer in the
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