python-drs
A PyTorch-inspired, event-driven Discrete Rate Simulation (DRS) framework for modeling systems where material flows continuously over time.
Instead of ticking through time at fixed intervals, DRS calculates exactly when the next limit (threshold) will be hit, jumps the simulation clock to that precise moment, and triggers the matching state transition. The result is a simulation that runs in a fraction of the time of fixed-step models — and never misses a limit.
Features
- Event-driven time stepping — simulate years of operation in seconds
- PyTorch-style architecture —
Module,Variable, andLevelcompose into hierarchies with automatic dependency tracking - Built-in telemetry — every state change is logged and plotted without custom tracking code
- Fail-fast guardrails — the engine stops you from breaking the physics of your model (e.g. draining an empty tank)
- Applicable to any continuous-flow system — water networks, chemical processing, electrical grids, traffic, and more
Installation
pip install python-drs
Optional extras:
pip install python-drs[progress] # Rich progress bar
Quickstart
from drs import DRSEngine, Module, Level
class Tank(Module):
def forward(self):
# Fill at 50 units per time step
self.volume.rate = 50.0
model = Tank()
model.volume = Level("Volume", initial_value=100.0)
engine = DRSEngine(model)
result = engine.run(max_time=20.0)
print(result.summary())
Documentation
Full guides, tutorials, and API reference live in the docs/ directory.
License
MIT — see LICENSE.
1 maintainer
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