https://github.com/halide/Halide
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Tip revision: d7cf9bcb11c9b7f0c2101e57b1439491313152fa authored by Steven Johnson on 09 October 2020, 16:25:38 UTC
Merge branch 'master' into abadams/nested_vectorization_tweaks
Merge branch 'master' into abadams/nested_vectorization_tweaks
Tip revision: d7cf9bc
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 `()`
- 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.
## 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 is not yet supported, but could
be with CMake work. (We have dropped support for Python 2.x and will not accept
patches to re-enable it.)
#### Python requirements:
See requirements.txt (to be used with `pip`:
`pip install --user requirements.txt`)
#### C++ requirements:
- Halide compiled to a distribution (e.g. `make distrib` or similar), with the
`HALIDE_DISTRIB_PATH` env var pointing to it
## Compilation instructions
Build using: `make`
## 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.
You can run them as a batch via `make test_apps` or `make test_tutorial`.
To run these examples, make sure the `PYTHONPATH` environment variable points to
your build directory (e.g.
`export PYTHONPATH=halide_source/python_bindings/bin:$PYTHONPATH`).
## 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.