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pytorch-symbolic

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Symbolic API for model creation in PyTorch

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# Pytorch Symbolic

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Pytorch Symbolic is MIT licensed library that adds symbolic API for model creation to PyTorch.

Pytorch Symbolic makes it easier and faster to define complex models.
It spares you writing boilerplate code.
It aims to be PyTorch equivalent for [Keras Functional API](https://keras.io/guides/functional_api/).

Features:

* Small extension of PyTorch
* No dependencies besides PyTorch
* Produces models entirely compatible with PyTorch
* Works with `torch.compile` and `torch.export`
* Overhead free as tested in [benchmarks](https://github.com/szmikler/pytorch-symbolic/blob/main/docs/benchmarks.md)
* Reduces the amount of boilerplate code
* Works well with complex architectures
* Code and documentation is automatically tested

## Example

To create a symbolic model, you need Symbolic Tensors and `torch.nn.Module`.
Register layers and operations in your model by calling ``layer(inputs)`` or
equivalently ``inputs(layer)``.
Layers will be automagically added to your model and
all operations will be replayed on the real data.
That's all!

Using Pytorch Symbolic, we can define a working classifier in a few lines of code:

```python
from torch import nn
from pytorch_symbolic import Input, SymbolicModel

inputs = Input(shape=(1, 28, 28))
x = nn.Flatten()(inputs)
x = nn.Linear(x.shape[1], 10)(x)(nn.Softmax(1))
model = SymbolicModel(inputs=inputs, outputs=x)
model.summary()
```

```stdout
_______________________________________________________
     Layer       Output shape        Params   Parent   
=======================================================
1    Input_1     (None, 1, 28, 28)   0                 
2    Flatten_1   (None, 784)         0        1        
3    Linear_1    (None, 10)          7850     2        
4*   Softmax_1   (None, 10)          0        3        
=======================================================
Total params: 7850
Trainable params: 7850
Non-trainable params: 0
_______________________________________________________
```

**See more examples
in [Documentation Quick Start](https://github.com/szmikler/pytorch-symbolic/blob/main/docs/quick_start.md).**

Symbolic models are plain `torch.nn.Module` objects, so they work with modern PyTorch tooling:

```python
model = SymbolicModel(inputs=inputs, outputs=x)
compiled_model = torch.compile(model)
exported_program = torch.export.export(model, (example_input,))
# ...
```

## How to start

See Jupyter Notebook showing the basic usage of Pytorch Symbolic:

* Learn Pytorch Symbolic in an interactive way.
* Try the package before installing it on your computer.
* See visualizations of graphs that are created under the hood.

Open in Colab:
[![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/szmikler/pytorch-symbolic/blob/main/introduction.ipynb)

## Installation

Install Pytorch Symbolic easily with pip:

```bash
pip install pytorch-symbolic
```

## Troubleshooting

Please create an issue if you notice a problem!

## Links

* [See Documentation](https://github.com/szmikler/pytorch-symbolic/blob/main/docs)
* [See on GitHub](https://github.com/szmikler/pytorch-symbolic)
* [See on PyPI](https://pypi.org/project/pytorch-symbolic)

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