### Changes:
- Removed `SimpleEmbedding` class, including its character-based embedding functionality and associated utility methods.
- Refined the Universal Sentence Encoder (USE) implementation:
- Added support for handling edge cases such as empty strings and arrays by returning zero vectors.
- Filtered out invalid input, improving robustness.
- Addressed `EPSILON` flag initialization and TensorFlow.js environment setup to prevent runtime errors.
- Updated error handling for embedding failures to provide more detailed traceability.
- Simplified `createEmbeddingFunction` and `defaultEmbeddingFunction` to focus solely on TensorFlow-based embeddings.
### Purpose:
Streamlined the embedding API by removing the outdated `SimpleEmbedding` class and fully transitioning to TensorFlow's Universal Sentence Encoder. These changes improve input validation, error resilience, and compatibility with TensorFlow.js, ensuring a more consistent and reliable embedding experience.
David Snelling
71b5e09462