ExpMan Python Wrapper
The expman Python package provides a seamless, idiomatic interface for logging experiments in Python projects while leveraging the high-performance Rust core.
Key Features
- Idiomatic Python: Uses context managers and singletons for clean integration into scripts and notebooks.
- Fast Logging: Native calls to the Rust engine ensure sub-microsecond logging latency.
- Automatic Cleanup: Ensures all file handles are closed and data is flushed upon script completion.
- TensorBoard Drop-in: Replace
from torch.utils.tensorboard import SummaryWriterwithfrom expman import SummaryWriter.
Installation
pip install expman-rs
Basic Usage
Global Singleton
import expman as exp
exp.init("my_model")
exp.log_vector({"loss": 0.42})
Context Manager
from expman import Experiment
with Experiment("my_model") as exp:
exp.log_vector({"loss": 0.42})
TensorBoard SummaryWriter (Drop-in Replacement)
Replace your existing TensorBoard import with expman's drop-in replacement. All metrics are stored in expman's high-performance Parquet format instead of TensorBoard event files.
# Before:
# from torch.utils.tensorboard import SummaryWriter
# After:
from expman import SummaryWriter
writer = SummaryWriter(log_dir="runs/my_experiment")
for epoch in range(100):
loss = 1.0 / (epoch + 1)
writer.add_scalar("train/loss", loss, epoch)
writer.add_scalars("metrics", {"accuracy": 0.95, "f1": 0.92}, 100)
writer.add_hparams({"lr": 0.001, "batch_size": 32}, {"hparam/accuracy": 0.95})
writer.close()
Supported methods:
| Method | Status | Notes |
|---|---|---|
add_scalar |
✅ Full | Logs as expman vector metric |
add_scalars |
✅ Full | Auto-prefixes tags with main_tag |
add_text |
✅ Full | Logged as info message |
add_hparams |
✅ Full | Logs params + initial metrics |
flush |
✅ No-op | Expman auto-flushes asynchronously |
close |
✅ Full | Graceful shutdown |
add_histogram |
⚠️ Stub | No-op, won't raise errors |
add_image/images |
⚠️ Stub | No-op, won't raise errors |
add_figure |
⚠️ Stub | No-op, won't raise errors |
add_video |
⚠️ Stub | No-op, won't raise errors |
add_audio |
⚠️ Stub | No-op, won't raise errors |
add_graph |
⚠️ Stub | No-op, won't raise errors |
add_embedding |
⚠️ Stub | No-op, won't raise errors |
add_pr_curve |
⚠️ Stub | No-op, won't raise errors |
add_custom_scalars |
⚠️ Stub | No-op, won't raise errors |
add_mesh |
⚠️ Stub | No-op, won't raise errors |
Internal Architecture
The wrapper uses PyO3 to create native Python extension modules that link directly to the Rust expman library.
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