A dynamically loadable XLA plugin proposal - Google Groups
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A dynamically loadable XLA plugin proposal - Google Groups
For example TF installation/plugins directory. ⢠May have an optional configuration file (co-located). ⢠This idea i
A dynamically loadable XLA plugin proposal Avijit Chakraborty, Intel
Motivation • XLA backends must currently be built with TensorFlow • Steep learning curve • Upstreaming plugins developed by various contributors may take up significant resources from core TensorFlow team • Changes in the “plugin” code (though unrelated to TensorFlow code) need to up upstreamed
• We have made minimal modifications to XLA to • Load XLA backends at runtime • Co-exists with traditional statically linked plugin backends
A dynamically loaded XLA Backend • Just a normal dynamic shared object library, loaded at run time (using dlopen) • The plugin is written using c++ and located outside of TensorFlow source tree • Depends on include files from TF installation (i.e., from Python site packages/tensorflow/include) • Links with libtensorflow_framework.so
• The plugin is placed in a well known location
• For example TF installation/plugins directory • May have an optional configuration file (co-located)
• This idea is very similar to TensorFlow “Adding a New Op”
TensorFlow changes • TensorFlow will have a plugin “adapter” that will connect with one or more plugin DSO libraries • The adapter will be initialized statically and will discover the plugin(s) • Load the plugin (.so), configure it, and query necessary data • If successful, register the plugin device with various TF registries • Platform, Compiler, Transfer Manager, Device • Connect the corresponding implementation components from the plugin DSO
• At run time, user scripts requests computation placement on this plugin device • Will follow the usual TensorFlow computation placement and execution
TensorFlow code changes • Need to modify the BUILD scripts
• Add additional header files (xla) to be included with the usual “include” target • Add additional library objects to the libtensorflow_framework.so • Add the additional directories to be packaged with Python wheel
• Need to implement the plugin “adapter” code • Compiler/plugin/ • Code is modeled from the existing XLA plugin code
• Some refactoring to separate out the static registration parts and functional parts
• Timeframe
• We already have written the code to test out this concept. Can submit the code for PR very soon – in the next few days. • Have included an example plugin that uses the HloEvaluator to run simple computations
