https://github.com/halide/Halide
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readme.md
## Differences from C++ API
The Python bindings attempt to mimic the Halide C++ API as closely as possible,
with some differences where the C++ idiom is either inappropriate or impossible:
- Most APIs that take a variadic argumentlist of ints in C++ take an explicit
list in Python. For instance, the usual version of the `Buffer` ctor in C++
offers variadic and list versions:
`Buffer<>(Type t, int extent_dim_0, int extent_dim_1, ...., extent_dim_N, string name = "") Buffer<>(Type t, vector<int> extents, string name = "")`
in Python, only the second variant is provided.
- `Func` and `Buffer` access is done using `[]` rather than `()`.
- For zero-dimensional `Func` and `Buffer`, you must explicitly specify `[()]` -- that is, use an empty tuple as the index" --
as `[]` is not syntactically acceptable in Python.
- Some classes in the Halide API aren't provided because they are 'wrapped' with
standard Python idioms:
- `Halide::Tuple` doesn't exist in the Python bindings; an ordinary Python
tuple of `Halide::Expr` is used instead.
- `Halide::Realization` doesn't exist in the Python bindings; an ordinary
Python tuple of `Halide::Buffer` is used instead.
- `Halide::Error` and friends don't exist; standard Python error handling is
used instead.
- static and instance method overloads with the same name in the same class
aren't allowed, so some convenience methods are missing from `Halide::Var`
- Templated types (notably `Halide::Buffer<>` and `Halide::Param<>`) aren't
provided, for obvious reasons; only the equivalents of `Halide::Buffer<void>`
and `Halide::Param<void>` are supported.
- Only things in the `Halide` namespace are supported; classes and methods that
involve using the `Halide::Internal` namespace are not provided.
- The functions in `Halide::ConciseCasts` are present in the toplevel Halide
module in Python, rather than a submodule: e.g., use `hl.i8_sat()`, not
`hl.ConciseCasts.i8_sat()`.
- No mechanism is provided for overriding any runtime functions from Python.
- No mechanism is provided for supporting `Func::define_extern`.
- `Buffer::for_each_value()` is hard to implement well in Python; it's omitted
entirely for now.
- `Func::in` becomes `Func.in_` because `in` is a Python keyword.
- `Func::async` becomes `Func.async_` because `async` is a Python keyword.
- The `not` keyword cannot be used to negate boolean Halide expressions.
Instead, the `logical_not` function can be used and is equivalent to
using `operator!` in C++.
## Enhancements to the C++ API
- The `Buffer` supports the Python Buffer Protocol
(https://www.python.org/dev/peps/pep-3118/) and thus is easily and cheaply
converted to and from other compatible objects (e.g., NumPy's `ndarray`), with
storage being shared.
## Prerequisites
The bindings (and demonstration applications) should work well for Python 3.4
(or higher), on Linux and OSX platforms. Windows support is experimental.
#### Python requirements:
The best way to get set up is to use a virtual environment:
```console
$ python3 -m venv venv
$ . venv/bin/activate
$ python3 -m pip install -U setuptools wheel
$ python3 -m pip install -r requirements.txt
```
## Compilation instructions
Build as part of the CMake build with `-DWITH_PYTHON_BINDINGS=ON`. Note that
this requires both Halide and LLVM to be built with RTTI and exceptions
**enabled**, which is not the default for LLVM.
## Documentation and Examples
The Python API reflects directly the
[C++ Halide API](http://halide-lang.org/docs).
Check out the code for the example applications in the `apps/` and `tutorial/`
subdirectory.
The tests run as part of the standard CTest infrastructure and are labeled with
the `python` label. You can run the Python tests specifically by running:
```
$ ctest -L python
```
From the Halide build directory.
## License
The Python bindings use the same
[MIT license](https://github.com/halide/Halide/blob/master/LICENSE.txt) as
Halide.
Python bindings provided by Connelly Barnes (2012-2013), Fred Rotbart (2014),
Rodrigo Benenson (2015) and the Halide open-source community.