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pesq.py
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pesq.py
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# Copyright The PyTorch 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.
from typing import Any, Callable, Optional
from torch import Tensor, tensor
from torchmetrics.functional.audio.pesq import pesq
from torchmetrics.metric import Metric
from torchmetrics.utilities.imports import _PESQ_AVAILABLE
class PESQ(Metric):
"""PESQ (Perceptual Evaluation of Speech Quality)
This is a wrapper for the pesq package [1]. . Note that input will be moved to `cpu`
to perform the metric calculation.
.. note:: using this metrics requires you to have ``pesq`` install. Either install as ``pip install
torchmetrics[audio]`` or ``pip install pesq``
Forward accepts
- ``preds``: ``shape [...,time]``
- ``target``: ``shape [...,time]``
Args:
fs:
sampling frequency, should be 16000 or 8000 (Hz)
mode:
'wb' (wide-band) or 'nb' (narrow-band)
keep_same_device:
whether to move the pesq value to the device of preds
compute_on_step:
Forward only calls ``update()`` and return ``None`` if this is set to ``False``.
dist_sync_on_step:
Synchronize metric state across processes at each ``forward()``
before returning the value at the step
process_group:
Specify the process group on which synchronization is called.
default: ``None`` (which selects the entire world)
dist_sync_fn:
Callback that performs the allgather operation on the metric state. When ``None``, DDP
will be used to perform the allgather
Raises:
ValueError:
If ``peqs`` package is not installed
ValueError:
If ``fs`` is not either ``8000`` or ``16000``
ValueError:
If ``mode`` is not either ``"wb"`` or ``"nb"``
Example:
>>> from torchmetrics.audio import PESQ
>>> import torch
>>> g = torch.manual_seed(1)
>>> preds = torch.randn(8000)
>>> target = torch.randn(8000)
>>> nb_pesq = PESQ(8000, 'nb')
>>> nb_pesq(preds, target)
tensor(2.2076)
>>> wb_pesq = PESQ(16000, 'wb')
>>> wb_pesq(preds, target)
tensor(1.7359)
References:
[1] https://github.com/ludlows/python-pesq
"""
sum_pesq: Tensor
total: Tensor
is_differentiable = False
higher_is_better = True
def __init__(
self,
fs: int,
mode: str,
compute_on_step: bool = True,
dist_sync_on_step: bool = False,
process_group: Optional[Any] = None,
dist_sync_fn: Optional[Callable[[Tensor], Tensor]] = None,
) -> None:
super().__init__(
compute_on_step=compute_on_step,
dist_sync_on_step=dist_sync_on_step,
process_group=process_group,
dist_sync_fn=dist_sync_fn,
)
if not _PESQ_AVAILABLE:
raise ValueError(
"PESQ metric requires that pesq is installed."
"Either install as `pip install torchmetrics[audio]` or `pip install pesq`"
)
if fs not in (8000, 16000):
raise ValueError(f"Expected argument `fs` to either be 8000 or 16000 but got {fs}")
self.fs = fs
if mode not in ("wb", "nb"):
raise ValueError(f"Expected argument `mode` to either be 'wb' or 'nb' but got {mode}")
self.mode = mode
self.add_state("sum_pesq", default=tensor(0.0), dist_reduce_fx="sum")
self.add_state("total", default=tensor(0), dist_reduce_fx="sum")
def update(self, preds: Tensor, target: Tensor) -> None: # type: ignore
"""Update state with predictions and targets.
Args:
preds: Predictions from model
target: Ground truth values
"""
pesq_batch = pesq(preds, target, self.fs, self.mode, False).to(self.sum_pesq.device)
self.sum_pesq += pesq_batch.sum()
self.total += pesq_batch.numel()
def compute(self) -> Tensor:
"""Computes average PESQ."""
return self.sum_pesq / self.total