Lambda

Added in v0.26.0

Apply a user-defined transform (callable) to the signal. The inspiration for this transform comes from albumentation's lambda transform. This allows one to have a little more fine-grained control over the operations in the context of a Compose, OneOf or SomeOf

Usage example

import random

from audiomentations import Lambda, OneOf, Gain


def gain_only_left_channel(samples, sample_rate):
    samples[0, :] *= random.uniform(0.8, 1.25)
    return samples


transform = OneOf(
    transforms=[Lambda(transform=gain_only_left_channel, p=1.0), Gain(p=1.0)]
)

augmented_sound = transform(my_stereo_waveform_ndarray, sample_rate=16000)

Lambda API

transform: Callable

A callable to be applied. It should input samples (ndarray), sample_rate (int) and optionally some user-defined keyword arguments.

p: float • range: [0.0, 1.0]

Default: 0.5. The probability of applying this transform.

**kwargs

Optional extra parameters passed to the callable transform