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stoi.py
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stoi.py
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# Copyright The Lightning team.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import numpy as np
import torch
from torch import Tensor
from torchmetrics.utilities.checks import _check_same_shape
from torchmetrics.utilities.imports import _PYSTOI_AVAILABLE
if not _PYSTOI_AVAILABLE:
__doctest_skip__ = ["short_time_objective_intelligibility"]
def short_time_objective_intelligibility(
preds: Tensor, target: Tensor, fs: int, extended: bool = False, keep_same_device: bool = False
) -> Tensor:
r"""Calculate STOI (Short-Time Objective Intelligibility) metric for evaluating speech signals.
Intelligibility measure which is highly correlated with the intelligibility of degraded speech signals, e.g., due to
additive noise, single-/multi-channel noise reduction, binary masking and vocoded speech as in CI simulations. The
STOI-measure is intrusive, i.e., a function of the clean and degraded speech signals. STOI may be a good alternative
to the speech intelligibility index (SII) or the speech transmission index (STI), when you are interested in
the effect of nonlinear processing to noisy speech, e.g., noise reduction, binary masking algorithms, on speech
intelligibility. Description taken from `Cees Taal's website`_ and for further details see `STOI ref1`_ and
`STOI ref2`_.
This metric is a wrapper for the `pystoi package`_. As the implementation backend implementation only supports
calculations on CPU, all input will automatically be moved to CPU to perform the metric calculation before being
moved back to the original device.
.. note:: using this metrics requires you to have ``pystoi`` install. Either install as ``pip install
torchmetrics[audio]`` or ``pip install pystoi``
Args:
preds: float tensor with shape ``(...,time)``
target: float tensor with shape ``(...,time)``
fs: sampling frequency (Hz)
extended: whether to use the extended STOI described in `STOI ref3`_.
keep_same_device: whether to move the stoi value to the device of preds
Returns:
stoi value of shape [...]
Raises:
ModuleNotFoundError:
If ``pystoi`` package is not installed
RuntimeError:
If ``preds`` and ``target`` does not have the same shape
Example:
>>> import torch
>>> from torchmetrics.functional.audio.stoi import short_time_objective_intelligibility
>>> g = torch.manual_seed(1)
>>> preds = torch.randn(8000)
>>> target = torch.randn(8000)
>>> short_time_objective_intelligibility(preds, target, 8000).float()
tensor(-0.0100)
"""
if not _PYSTOI_AVAILABLE:
raise ModuleNotFoundError(
"ShortTimeObjectiveIntelligibility metric requires that `pystoi` is installed."
" Either install as `pip install torchmetrics[audio]` or `pip install pystoi`."
)
from pystoi import stoi as stoi_backend
_check_same_shape(preds, target)
if len(preds.shape) == 1:
stoi_val_np = stoi_backend(target.detach().cpu().numpy(), preds.detach().cpu().numpy(), fs, extended)
stoi_val = torch.tensor(stoi_val_np)
else:
preds_np = preds.reshape(-1, preds.shape[-1]).detach().cpu().numpy()
target_np = target.reshape(-1, preds.shape[-1]).detach().cpu().numpy()
stoi_val_np = np.empty(shape=(preds_np.shape[0]))
for b in range(preds_np.shape[0]):
stoi_val_np[b] = stoi_backend(target_np[b, :], preds_np[b, :], fs, extended)
stoi_val = torch.from_numpy(stoi_val_np)
stoi_val = stoi_val.reshape(preds.shape[:-1])
if keep_same_device:
return stoi_val.to(preds.device)
return stoi_val