CMake Error “Could Not Find OpenBLAS” When Installing OpenFace In Docker

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Introduction

Installing OpenFace in a Docker container can be a challenging task, especially when encountering errors during the build process. One common issue that developers face is the CMake error "Could not find OpenBLAS." This error occurs when CMake is unable to locate the OpenBLAS library, which is a crucial dependency for OpenFace. In this article, we will explore the possible causes of this error and provide step-by-step solutions to resolve it.

Understanding the Error

The CMake error "Could not find OpenBLAS" typically occurs when the CMake configuration is unable to locate the OpenBLAS library. This library is a high-performance BLAS (Basic Linear Algebra Subprograms) implementation that is widely used in scientific computing and machine learning applications. OpenFace, a popular open-source face recognition framework, relies heavily on OpenBLAS for its performance-critical components.

Possible Causes of the Error

There are several possible reasons why CMake may fail to find OpenBLAS:

  • Missing OpenBLAS installation: OpenBLAS is not installed on the system, or it is not properly configured.
  • Incorrect OpenBLAS version: The version of OpenBLAS installed on the system is not compatible with the version required by OpenFace.
  • CMake configuration issues: The CMake configuration is not properly set up to find the OpenBLAS library.

Solution 1: Install OpenBLAS Manually

To resolve the CMake error, you can try installing OpenBLAS manually using the following steps:

Step 1: Update the Package List

Update the package list to ensure that you have the latest version of OpenBLAS available:

sudo apt update

Step 2: Install OpenBLAS

Install OpenBLAS using the following command:

sudo apt install libopenblas-dev

Step 3: Verify OpenBLAS Installation

Verify that OpenBLAS is installed correctly by checking the version:

blas-lapack-config --version

Solution 2: Use a Pre-compiled OpenBLAS Package

If installing OpenBLAS manually is not feasible, you can try using a pre-compiled OpenBLAS package. This package is available on the Ubuntu package repository and can be installed using the following command:

sudo apt install libopenblas-base libopenblas-dev

Solution 3: Configure CMake to Find OpenBLAS

If the above solutions do not work, you can try configuring CMake to find OpenBLAS manually. This can be done by setting the CMAKE_PREFIX_PATH variable to the location of the OpenBLAS installation:

cmake -DCMAKE_PREFIX_PATH=/usr/lib/x86_64-linux-gnu/openblas ..

Solution 4: Use a Docker Image with OpenBLAS Pre-installed

If you are using a Docker container, you can try using a Docker image with OpenBLAS pre-installed. This can save you the hassle of installing OpenBLAS manually and configuring CMake.

Conclusion

The CMake error "Could not find OpenBLAS" is a common issue that developers face when installing OpenFace in a Docker container. By understanding the possible causes of this error and following the step-by-step solutions provided in this article, you should be able to resolve the issue and successfully install OpenFace in your Docker container.

Additional Resources

Troubleshooting Tips

  • Verify OpenBLAS installation: Make sure that OpenBLAS is installed correctly and that the version is compatible with OpenFace.
  • Check CMake configuration: Verify that the CMake configuration is set up correctly to find the OpenBLAS library.
  • Use a pre-compiled OpenBLAS package: Consider using a pre-compiled OpenBLAS package to save time and effort.
  • Use a Docker image with OpenBLAS pre-installed: Use a Docker image with OpenBLAS pre-installed to simplify the installation process.

Introduction

Installing OpenFace in a Docker container can be a challenging task, especially when encountering errors during the build process. One common issue that developers face is the CMake error "Could not find OpenBLAS." In this Q&A article, we will address some of the most frequently asked questions related to this error and provide detailed answers to help you resolve the issue.

Q1: What is OpenBLAS, and why is it required for OpenFace?

A1: OpenBLAS is a high-performance BLAS (Basic Linear Algebra Subprograms) implementation that is widely used in scientific computing and machine learning applications. OpenFace, a popular open-source face recognition framework, relies heavily on OpenBLAS for its performance-critical components. OpenBLAS is required for OpenFace to function correctly.

Q2: Why does CMake fail to find OpenBLAS?

A2: CMake fails to find OpenBLAS due to several reasons, including:

  • Missing OpenBLAS installation: OpenBLAS is not installed on the system, or it is not properly configured.
  • Incorrect OpenBLAS version: The version of OpenBLAS installed on the system is not compatible with the version required by OpenFace.
  • CMake configuration issues: The CMake configuration is not properly set up to find the OpenBLAS library.

Q3: How can I install OpenBLAS manually?

A3: To install OpenBLAS manually, follow these steps:

Step 1: Update the Package List

Update the package list to ensure that you have the latest version of OpenBLAS available:

sudo apt update

Step 2: Install OpenBLAS

Install OpenBLAS using the following command:

sudo apt install libopenblas-dev

Step 3: Verify OpenBLAS Installation

Verify that OpenBLAS is installed correctly by checking the version:

blas-lapack-config --version

Q4: Can I use a pre-compiled OpenBLAS package?

A4: Yes, you can use a pre-compiled OpenBLAS package. This package is available on the Ubuntu package repository and can be installed using the following command:

sudo apt install libopenblas-base libopenblas-dev

Q5: How can I configure CMake to find OpenBLAS?

A5: To configure CMake to find OpenBLAS, set the CMAKE_PREFIX_PATH variable to the location of the OpenBLAS installation:

cmake -DCMAKE_PREFIX_PATH=/usr/lib/x86_64-linux-gnu/openblas ..

Q6: Can I use a Docker image with OpenBLAS pre-installed?

A6: Yes, you can use a Docker image with OpenBLAS pre-installed. This can save you the hassle of installing OpenBLAS manually and configuring CMake.

Q7: What are some common troubleshooting tips for resolving the CMake error?

A7: Some common troubleshooting tips for resolving the CMake error include:

  • Verify OpenBLAS installation: Make sure that OpenBLAS is installed correctly and that the version is compatible with OpenFace.
  • Check CMake configuration: Verify that the CMake is set up correctly to find the OpenBLAS library.
  • Use a pre-compiled OpenBLAS package: Consider using a pre-compiled OpenBLAS package to save time and effort.
  • Use a Docker image with OpenBLAS pre-installed: Use a Docker image with OpenBLAS pre-installed to simplify the installation process.

Conclusion

The CMake error "Could not find OpenBLAS" is a common issue that developers face when installing OpenFace in a Docker container. By understanding the possible causes of this error and following the step-by-step solutions provided in this Q&A article, you should be able to resolve the issue and successfully install OpenFace in your Docker container.

Additional Resources

Troubleshooting Tips

  • Verify OpenBLAS installation: Make sure that OpenBLAS is installed correctly and that the version is compatible with OpenFace.
  • Check CMake configuration: Verify that the CMake configuration is set up correctly to find the OpenBLAS library.
  • Use a pre-compiled OpenBLAS package: Consider using a pre-compiled OpenBLAS package to save time and effort.
  • Use a Docker image with OpenBLAS pre-installed: Use a Docker image with OpenBLAS pre-installed to simplify the installation process.