Allow specification of odd length boundary padding in MatrixWavedec

src/ptwt/_util.py

@@ -2,13 +2,16 @@
 
 from __future__ import annotations
 
+import functools
 import typing
-from collections.abc import Sequence
-from typing import Any, Callable, NamedTuple, Optional, Protocol, Union, cast, overload
+import warnings
+from collections.abc import Callable, Sequence
+from typing import Any, NamedTuple, Optional, Protocol, Union, cast, overload
 
 import numpy as np
 import pywt
 import torch
+from typing_extensions import ParamSpec, TypeVar
 
 from .constants import (
     OrthogonalizeMethod,
@@ -253,3 +256,55 @@ def _map_result(
         Union[list[WaveletDetailDict], list[WaveletDetailTuple2d]], result_lst
     )
     return approx, *cast_result_lst
+
+
+Param = ParamSpec("Param")
+RetType = TypeVar("RetType")
+
+
+def _deprecated_alias(
+    **aliases: str,
+) -> Callable[[Callable[Param, RetType]], Callable[Param, RetType]]:
+    """Handle deprecated function and method arguments.
+
+    Use as follows::
+
+        @deprecated_alias(old_arg='new_arg')
+        def myfunc(new_arg):
+            ...
+
+    Adapted from https://stackoverflow.com/a/49802489
+    """
+
+    def rename_kwargs(
+        func_name: str,
+        kwargs: Param.kwargs,
+        aliases: dict[str, str],
+    ) -> None:
+        """Rename deprecated kwarg."""
+        for alias, new in aliases.items():
+            if alias in kwargs:
+                if new in kwargs:
+                    raise TypeError(
+                        f"{func_name} received both {alias} and {new} as arguments!"
+                        f" {alias} is deprecated, use {new} instead."
+                    )
+                warnings.warn(
+                    message=(
+                        f"`{alias}` is deprecated as an argument to `{func_name}`; use"
+                        f" `{new}` instead."
+                    ),
+                    category=DeprecationWarning,
+                    stacklevel=3,
+                )
+                kwargs[new] = kwargs.pop(alias)
+
+    def deco(f: Callable[Param, RetType]) -> Callable[Param, RetType]:
+        @functools.wraps(f)
+        def wrapper(*args: Param.args, **kwargs: Param.kwargs) -> RetType:
+            rename_kwargs(f.__name__, kwargs, aliases)
+            return f(*args, **kwargs)
+
+        return wrapper
+
+    return deco

src/ptwt/conv_transform.py

@@ -135,6 +135,7 @@ def _fwt_pad(
     wavelet: Union[Wavelet, str],
     *,
     mode: Optional[BoundaryMode] = None,
+    padding: Optional[tuple[int, int]] = None,
 ) -> torch.Tensor:
     """Pad the input signal to make the fwt matrix work.
 
@@ -144,21 +145,25 @@ def _fwt_pad(
         data (torch.Tensor): Input data ``[batch_size, 1, time]``
         wavelet (Wavelet or str): A pywt wavelet compatible object or
             the name of a pywt wavelet.
-        mode :
-            The desired padding mode for extending the signal along the edges.
+        mode: The desired padding mode for extending the signal along the edges.
             Defaults to "reflect". See :data:`ptwt.constants.BoundaryMode`.
+        padding (tuple[int, int], optional): A tuple (padl, padr) with the
+            number of padded values on the left and right side of the last
+            axes of `data`. If None, the padding values are computed based
+            on the signal shape and the wavelet length. Defaults to None.
 
     Returns:
         A PyTorch tensor with the padded input data
     """
-    wavelet = _as_wavelet(wavelet)
-
     # convert pywt to pytorch convention.
     if mode is None:
         mode = "reflect"
     pytorch_mode = _translate_boundary_strings(mode)
 
-    padr, padl = _get_pad(data.shape[-1], _get_len(wavelet))
+    if padding is None:
+        padr, padl = _get_pad(data.shape[-1], _get_len(wavelet))
+    else:
+        padl, padr = padding
     if pytorch_mode == "symmetric":
         data_pad = _pad_symmetric(data, [(padl, padr)])
     else:

src/ptwt/conv_transform_2.py

@@ -65,6 +65,7 @@ def _fwt_pad2(
     wavelet: Union[Wavelet, str],
     *,
     mode: Optional[BoundaryMode] = None,
+    padding: Optional[tuple[int, int, int, int]] = None,
 ) -> torch.Tensor:
     """Pad data for the 2d FWT.
 
@@ -76,9 +77,13 @@ def _fwt_pad2(
             the name of a pywt wavelet.
             Refer to the output from ``pywt.wavelist(kind='discrete')``
             for possible choices.
-        mode :
-            The desired padding mode for extending the signal along the edges.
+        mode: The desired padding mode for extending the signal along the edges.
             Defaults to "reflect". See :data:`ptwt.constants.BoundaryMode`.
+        padding (tuple[int, int, int, int], optional): A tuple
+            (padl, padr, padt, padb) with the number of padded values
+            on the left, right, top and bottom side of the last two
+            axes of `data`. If None, the padding values are computed based
+            on the signal shape and the wavelet length. Defaults to None.
 
     Returns:
         The padded output tensor.
@@ -87,9 +92,12 @@ def _fwt_pad2(
     if mode is None:
         mode = "reflect"
     pytorch_mode = _translate_boundary_strings(mode)
-    wavelet = _as_wavelet(wavelet)
-    padb, padt = _get_pad(data.shape[-2], _get_len(wavelet))
-    padr, padl = _get_pad(data.shape[-1], _get_len(wavelet))
+
+    if padding is None:
+        padb, padt = _get_pad(data.shape[-2], _get_len(wavelet))
+        padr, padl = _get_pad(data.shape[-1], _get_len(wavelet))
+    else:
+        padl, padr, padt, padb = padding
     if pytorch_mode == "symmetric":
         data_pad = _pad_symmetric(data, [(padt, padb), (padl, padr)])
     else:

src/ptwt/conv_transform_3.py

@@ -65,7 +65,11 @@ def _construct_3d_filt(lo: torch.Tensor, hi: torch.Tensor) -> torch.Tensor:
 
 
 def _fwt_pad3(
-    data: torch.Tensor, wavelet: Union[Wavelet, str], *, mode: BoundaryMode
+    data: torch.Tensor,
+    wavelet: Union[Wavelet, str],
+    *,
+    mode: BoundaryMode,
+    padding: Optional[tuple[int, int, int, int, int, int]] = None,
 ) -> torch.Tensor:
     """Pad data for the 3d-FWT.
 
@@ -77,19 +81,26 @@ def _fwt_pad3(
             the name of a pywt wavelet.
             Refer to the output from ``pywt.wavelist(kind='discrete')``
             for possible choices.
-        mode :
-            The desired padding mode for extending the signal along the edges.
+        mode: The desired padding mode for extending the signal along the edges.
             See :data:`ptwt.constants.BoundaryMode`.
+        padding (tuple[int, int, int, int, int, int], optional): A tuple
+            (pad_left, pad_right, pad_top, pad_bottom, pad_front, pad_back)
+            with the number of padded values on the respective side of the
+            last three axes of `data`.
+            If None, the padding values are computed based
+            on the signal shape and the wavelet length. Defaults to None.
 
     Returns:
         The padded output tensor.
     """
     pytorch_mode = _translate_boundary_strings(mode)
 
-    wavelet = _as_wavelet(wavelet)
-    pad_back, pad_front = _get_pad(data.shape[-3], _get_len(wavelet))
-    pad_bottom, pad_top = _get_pad(data.shape[-2], _get_len(wavelet))
-    pad_right, pad_left = _get_pad(data.shape[-1], _get_len(wavelet))
+    if padding is None:
+        pad_back, pad_front = _get_pad(data.shape[-3], _get_len(wavelet))
+        pad_bottom, pad_top = _get_pad(data.shape[-2], _get_len(wavelet))
+        pad_right, pad_left = _get_pad(data.shape[-1], _get_len(wavelet))
+    else:
+        pad_left, pad_right, pad_top, pad_bottom, pad_front, pad_back = padding
     if pytorch_mode == "symmetric":
         data_pad = _pad_symmetric(
             data, [(pad_front, pad_back), (pad_top, pad_bottom), (pad_left, pad_right)]