Developing a Python App on FICO® Platform

When developing a Python app for FICO^® Platform, you must specify the versions of Python and any other necessary packages that must be installed on the Xpress Insight worker.

A CONDA environment.yml file must be used to define the version of Python to be installed on the Insight worker, but other package versions can be defined either within the environment.yml file, or within a pip requirements.txt file. Both the environment.yml file (and the requirements.txt file, if present) must be stored in the model_resources directory.

Note: After the specified packages have been installed, they will be cached per App per Worker. Packages will be fetched again if the environment.yml or requirements.txt files are changed.

When creating a python project using Xpress Workbench on FICO^® Platform, the environment.yml file is created under model_resources.

If you upload a Python Xpress Insight application to FICO^® Platform, the Python source is unzipped and placed in the model_resources directory. If the app does not contain an environment.yml file, a basic file will be created.

When developing on FICO^® Platform, the Xpress Workbench terminal does not have access to Java or node.js

Creating the environment.yml and requirements.txt files

The environment.yml file should be created in the model_resources directory. To use the Xpress or Xpress Insight modules, the fico-xpress channel must be specified in the environment.yml file. The environment.yml file should take the following format:

channels:
	- fico-xpress
dependencies:
	- python=3.10
	- xpress~=9.1.0
	- xpressinsight=1.6.0 

By using the ~= notation with a package version, you will receive the latest minor version of the package within your specified major version. For example, if you specify xpress~=9.1.0 you will receive the latest 9.1.x version.

Note: Exact versions should be used for production applications.

The CONDA environment.yml file can also be used to specify pip packages, as shown in the example below.

channels:
	- fico-xpress
dependencies:
	- python=3.10
	- pip
	- pip:
		- xpress
		- xpressinsight

To see the full specification of the environment.yml file, see the CONDA documentation.

Alternatively, to use pip to define packages to be installed, create a requirements.txt file in the model_resources directory, using the following format:

xpress == 9.1
xpressinsight == 1.6.0

To see the full specification of the requirements.txt file, see the pip documentation.

Note: Please note that URLs cannot be included in either the environment.yml file or the requirements.txt file.

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