ENH add *args support for numba apply

doc/source/whatsnew/v3.0.0.rst

@@ -498,6 +498,7 @@ Other
 - Bug in :class:`DataFrame` when passing a ``dict`` with a NA scalar and ``columns`` that would always return ``np.nan`` (:issue:`57205`)
 - Bug in :func:`eval` where the names of the :class:`Series` were not preserved when using ``engine="numexpr"``. (:issue:`10239`)
 - Bug in :func:`unique` on :class:`Index` not always returning :class:`Index` (:issue:`57043`)
+- Bug in :meth:`DataFrame.apply` where passing ``engine="numba"`` ignored ``args`` passed to the applied function (:issue:`58712`)
 - Bug in :meth:`DataFrame.eval` and :meth:`DataFrame.query` which caused an exception when using NumPy attributes via ``@`` notation, e.g., ``df.eval("@np.floor(a)")``. (:issue:`58041`)
 - Bug in :meth:`DataFrame.eval` and :meth:`DataFrame.query` which did not allow to use ``tan`` function. (:issue:`55091`)
 - Bug in :meth:`DataFrame.sort_index` when passing ``axis="columns"`` and ``ignore_index=True`` and ``ascending=False`` not returning a :class:`RangeIndex` columns (:issue:`57293`)

pandas/core/_numba/executor.py

@@ -14,17 +14,19 @@
 
 from pandas.compat._optional import import_optional_dependency
 
+from pandas.core.util.numba_ import jit_user_function
+
 
 @functools.cache
 def generate_apply_looper(func, nopython=True, nogil=True, parallel=False):
     if TYPE_CHECKING:
         import numba
     else:
         numba = import_optional_dependency("numba")
-    nb_compat_func = numba.extending.register_jitable(func)
+    nb_compat_func = jit_user_function(func)
 
     @numba.jit(nopython=nopython, nogil=nogil, parallel=parallel)
-    def nb_looper(values, axis):
+    def nb_looper(values, axis, *args):
         # Operate on the first row/col in order to get
         # the output shape
         if axis == 0:
@@ -33,7 +35,7 @@ def nb_looper(values, axis):
         else:
             first_elem = values[0]
             dim0 = values.shape[0]
-        res0 = nb_compat_func(first_elem)
+        res0 = nb_compat_func(first_elem, *args)
         # Use np.asarray to get shape for
         # https://github.com/numba/numba/issues/4202#issuecomment-1185981507
         buf_shape = (dim0,) + np.atleast_1d(np.asarray(res0)).shape
@@ -44,11 +46,11 @@ def nb_looper(values, axis):
         if axis == 1:
             buff[0] = res0
             for i in numba.prange(1, values.shape[0]):
-                buff[i] = nb_compat_func(values[i])
+                buff[i] = nb_compat_func(values[i], *args)
         else:
             buff[:, 0] = res0
             for j in numba.prange(1, values.shape[1]):
-                buff[:, j] = nb_compat_func(values[:, j])
+                buff[:, j] = nb_compat_func(values[:, j], *args)
         return buff
 
     return nb_looper

pandas/core/apply.py

@@ -51,6 +51,10 @@
 from pandas.core._numba.executor import generate_apply_looper
 import pandas.core.common as com
 from pandas.core.construction import ensure_wrapped_if_datetimelike
+from pandas.core.util.numba_ import (
+    get_jit_arguments,
+    prepare_function_arguments,
+)
 
 if TYPE_CHECKING:
     from collections.abc import (
@@ -70,7 +74,6 @@
     from pandas.core.resample import Resampler
     from pandas.core.window.rolling import BaseWindow
 
-
 ResType = dict[int, Any]
 
 
@@ -972,17 +975,20 @@ def wrapper(*args, **kwargs):
             return wrapper
 
         if engine == "numba":
-            engine_kwargs = {} if engine_kwargs is None else engine_kwargs
-
+            args, kwargs = prepare_function_arguments(
+                self.func,  # type: ignore[arg-type]
+                self.args,
+                self.kwargs,
+            )
             # error: Argument 1 to "__call__" of "_lru_cache_wrapper" has
             # incompatible type "Callable[..., Any] | str | list[Callable
             # [..., Any] | str] | dict[Hashable,Callable[..., Any] | str |
             # list[Callable[..., Any] | str]]"; expected "Hashable"
             nb_looper = generate_apply_looper(
                 self.func,  # type: ignore[arg-type]
-                **engine_kwargs,
+                **get_jit_arguments(engine_kwargs, kwargs),
             )
-            result = nb_looper(self.values, self.axis)
+            result = nb_looper(self.values, self.axis, *args)
             # If we made the result 2-D, squeeze it back to 1-D
             result = np.squeeze(result)
         else:
@@ -1123,21 +1129,23 @@ def generate_numba_apply_func(
         # Currently the parallel argument doesn't get passed through here
         # (it's disabled) since the dicts in numba aren't thread-safe.
         @numba.jit(nogil=nogil, nopython=nopython, parallel=parallel)
-        def numba_func(values, col_names, df_index):
+        def numba_func(values, col_names, df_index, *args):
             results = {}
             for j in range(values.shape[1]):
                 # Create the series
                 ser = Series(
                     values[:, j], index=df_index, name=maybe_cast_str(col_names[j])
                 )
-                results[j] = jitted_udf(ser)
+                results[j] = jitted_udf(ser, *args)
             return results
 
         return numba_func
 
     def apply_with_numba(self) -> dict[int, Any]:
+        func = cast(Callable, self.func)
+        args, kwargs = prepare_function_arguments(func, self.args, self.kwargs)
         nb_func = self.generate_numba_apply_func(
-            cast(Callable, self.func), **self.engine_kwargs
+            func, **get_jit_arguments(self.engine_kwargs, kwargs)
         )
         from pandas.core._numba.extensions import set_numba_data
 
@@ -1152,7 +1160,7 @@ def apply_with_numba(self) -> dict[int, Any]:
         # Convert from numba dict to regular dict
         # Our isinstance checks in the df constructor don't pass for numbas typed dict
         with set_numba_data(index) as index, set_numba_data(columns) as columns:
-            res = dict(nb_func(self.values, columns, index))
+            res = dict(nb_func(self.values, columns, index, *args))
         return res
 
     @property
@@ -1260,7 +1268,7 @@ def generate_numba_apply_func(
         jitted_udf = numba.extending.register_jitable(func)
 
         @numba.jit(nogil=nogil, nopython=nopython, parallel=parallel)
-        def numba_func(values, col_names_index, index):
+        def numba_func(values, col_names_index, index, *args):
             results = {}
             # Currently the parallel argument doesn't get passed through here
             # (it's disabled) since the dicts in numba aren't thread-safe.
@@ -1272,15 +1280,17 @@ def numba_func(values, col_names_index, index):
                     index=col_names_index,
                     name=maybe_cast_str(index[i]),
                 )
-                results[i] = jitted_udf(ser)
+                results[i] = jitted_udf(ser, *args)
 
             return results
 
         return numba_func
 
     def apply_with_numba(self) -> dict[int, Any]:
+        func = cast(Callable, self.func)
+        args, kwargs = prepare_function_arguments(func, self.args, self.kwargs)
         nb_func = self.generate_numba_apply_func(
-            cast(Callable, self.func), **self.engine_kwargs
+            func, **get_jit_arguments(self.engine_kwargs, kwargs)
         )
 
         from pandas.core._numba.extensions import set_numba_data
@@ -1291,7 +1301,7 @@ def apply_with_numba(self) -> dict[int, Any]:
             set_numba_data(self.obj.index) as index,
             set_numba_data(self.columns) as columns,
         ):
-            res = dict(nb_func(self.values, columns, index))
+            res = dict(nb_func(self.values, columns, index, *args))
 
         return res
 

pandas/core/util/numba_.py

@@ -2,6 +2,7 @@
 
 from __future__ import annotations
 
+import inspect
 import types
 from typing import (
     TYPE_CHECKING,
@@ -54,10 +55,15 @@ def get_jit_arguments(
         engine_kwargs = {}
 
     nopython = engine_kwargs.get("nopython", True)
-    if kwargs and nopython:
+    if kwargs:
+        # Note: in case numba supports keyword-only arguments in
+        # a future version, we should remove this check. But this
+        # seems unlikely to happen soon.
+
         raise NumbaUtilError(
-            "numba does not support kwargs with nopython=True: "
-            "https://github.com/numba/numba/issues/2916"
+            "numba does not support keyword-only arguments"
+            "https://github.com/numba/numba/issues/2916, "
+            "https://github.com/numba/numba/issues/6846"
         )
     nogil = engine_kwargs.get("nogil", False)
     parallel = engine_kwargs.get("parallel", False)
@@ -97,3 +103,47 @@ def jit_user_function(func: Callable) -> Callable:
         numba_func = numba.extending.register_jitable(func)
 
     return numba_func
+
+
+_sentinel = object()
+
+
+def prepare_function_arguments(
+    func: Callable, args: tuple, kwargs: dict
+) -> tuple[tuple, dict]:
+    """
+    Prepare arguments for jitted function. As numba functions do not support kwargs,
+    we try to move kwargs into args if possible.
+
+    Parameters
+    ----------
+    func : function
+        user defined function
+    args : tuple
+        user input positional arguments
+    kwargs : dict
+        user input keyword arguments
+
+    Returns
+    -------
+    tuple[tuple, dict]
+        args, kwargs
+
+    """
+    if not kwargs:
+        return args, kwargs
+
+    # the udf should have this pattern: def udf(value, *args, **kwargs):...
+    signature = inspect.signature(func)
+    arguments = signature.bind(_sentinel, *args, **kwargs)
+    arguments.apply_defaults()
+    # Ref: https://peps.python.org/pep-0362/
+    # Arguments which could be passed as part of either *args or **kwargs
+    # will be included only in the BoundArguments.args attribute.
+    args = arguments.args
+    kwargs = arguments.kwargs
+
+    assert args[0] is _sentinel
+    args = args[1:]
+
+    return args, kwargs

pandas/tests/apply/test_frame_apply.py

@@ -63,16 +63,60 @@ def test_apply(float_frame, engine, request):
 
 @pytest.mark.parametrize("axis", [0, 1])
 @pytest.mark.parametrize("raw", [True, False])
-def test_apply_args(float_frame, axis, raw, engine, request):
-    if engine == "numba":
-        mark = pytest.mark.xfail(reason="numba engine doesn't support args")
-        request.node.add_marker(mark)
+@pytest.mark.parametrize("nopython", [True, False])
+def test_apply_args(float_frame, axis, raw, engine, nopython):
+    engine_kwargs = {"nopython": nopython}
     result = float_frame.apply(
-        lambda x, y: x + y, axis, args=(1,), raw=raw, engine=engine
+        lambda x, y: x + y,
+        axis,
+        args=(1,),
+        raw=raw,
+        engine=engine,
+        engine_kwargs=engine_kwargs,
     )
     expected = float_frame + 1
     tm.assert_frame_equal(result, expected)
 
+    # GH:58712
+    result = float_frame.apply(
+        lambda x, a, b: x + a + b,
+        args=(1,),
+        b=2,
+        raw=raw,
+        engine=engine,
+        engine_kwargs=engine_kwargs,
+    )
+    expected = float_frame + 3
+    tm.assert_frame_equal(result, expected)
+
+    if engine == "numba":
+        # keyword-only arguments are not supported in numba
+        with pytest.raises(
+            pd.errors.NumbaUtilError,
+            match="numba does not support keyword-only arguments",
+        ):
+            float_frame.apply(
+                lambda x, a, *, b: x + a + b,
+                args=(1,),
+                b=2,
+                raw=raw,
+                engine=engine,
+                engine_kwargs=engine_kwargs,
+            )
+
+        with pytest.raises(
+            pd.errors.NumbaUtilError,
+            match="numba does not support keyword-only arguments",
+        ):
+            float_frame.apply(
+                lambda *x, b: x[0] + x[1] + b,
+                args=(1,),
+                b=2,
+                raw=raw,
+                engine=engine,
+                engine_kwargs=engine_kwargs,
+            )
+
 
 def test_apply_categorical_func():
     # GH 9573

pandas/tests/window/test_numba.py

@@ -304,7 +304,9 @@ def f(x):
 
 @td.skip_if_no("numba")
 def test_invalid_kwargs_nopython():
-    with pytest.raises(NumbaUtilError, match="numba does not support kwargs with"):
+    with pytest.raises(
+        NumbaUtilError, match="numba does not support keyword-only arguments"
+    ):
         Series(range(1)).rolling(1).apply(
             lambda x: x, kwargs={"a": 1}, engine="numba", raw=True
         )