What are these different options for? (TFMIC-17)

[gamename]

Hi,

There is an #if construct here in feature_provider.cc. It is continued here and here.

What are the different conditions for? In other words, what is the different purpose of each?

Here is what GPT thinks

// The FeatureProvider class is responsible for fetching audio samples, 
// processing them into features, and populating the feature buffer for use 
// by a TensorFlow Lite model. The class supports different methods for 
// populating the feature data, controlled by `#if` directives to facilitate 
// various development, testing, and operational scenarios.

#if 1
  // This block is the primary operational mode where the feature data is 
  // populated based on the real-time audio samples collected from the 
  // environment or an audio source. It calculates the number of new slices 
  // needed based on the time elapsed since the last update, maintains a 
  // sliding window of feature data by discarding old slices and adding new 
  // ones, and generates features for new audio slices. This mode is 
  // intended for real-world application use, providing dynamic feature 
  // updates as new audio data becomes available.

#elif 1
  // This preprocessor block is an alternative mode designed for testing 
  // or debugging. It simulates the feature data population using predefined 
  // audio samples (e.g., "yes", "no", "noise", "silence") to mimic various 
  // sound scenarios. This mode allows developers to test the system's 
  // response to specific audio inputs without the need for real-time audio 
  // capture. It cycles through the predefined samples in a fixed order, 
  // potentially useful for systematic testing of the model's classification 
  // accuracy across different audio categories.

#else
  // This final block represents another alternative mode, likely intended 
  // for a different form of testing or operational condition not explicitly 
  // detailed in the snippet. This block might be used for scenarios where 
  // either a continuous stream of a specific type of audio data is needed 
  // for testing, or a placeholder for future code paths that require 
  // different handling of audio samples or feature generation. Given the 
  // lack of active code in this `#else` block and the comment indicating 
  // a potential bug fix or future implementation, it serves as a template 
  // or reminder for additional functionality that could be integrated.

#endif

Thanks

PS - Once explained/discussed, I'll be happy to submit a PR for a doc update with the explanations.

[vikramdattu]

Hello @gamename thanks! As you've correctly identified with the help of GPT, both the other piece of code are for debugging purpose. Since, you have shown interest, please go ahead and raise a PR with #else block removed and #elif 1 with the description that it is for testing with pre-defined audio samples.
We can then review and close on final changes.