refactor: adopt _src pattern and migrate core components
#763
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- Restructured the repository to separate internal logic (`pina/_src`) from the public API. - Migrated central components (Graph, LabelTensor, Operator, Trainer) into `pina/_src/core/` for better organization. - Updated all subpackage `__init__.py` files to expose a clean, flat import surface for users. - Standardized module docstrings across Solvers, Models, Equations, Domains, and Callbacks to improve documentation quality. - Optimized internal dictionary handling in tensor storage functions.
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Description
This PR resolves #756 by implementing a major structural refactor. Following the design patterns of modern scientific libraries like JAX and Optax, it introduces a
pina/_srcdirectory to house internal logic while exposing a clean, flat public API.API Stability Notice
The public interface remains unchanged. Existing user scripts and external calls to PINA classes will continue to work as expected. This refactor purely reorganizes the internal source code and "hoists" definitions to their respective package levels for cleaner access.
Key Changes
pina._src.core/module.Checklist