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Expose dither in python API #2127

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Apr 17, 2025
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Expose dither in python API #2127

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7 changes: 7 additions & 0 deletions sherpa-onnx/python/sherpa_onnx/offline_recognizer.py
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Original file line number Diff line number Diff line change
Expand Up @@ -49,6 +49,7 @@ def from_transducer(
num_threads: int = 1,
sample_rate: int = 16000,
feature_dim: int = 80,
dither: float = 0.0,
decoding_method: str = "greedy_search",
max_active_paths: int = 4,
hotwords_file: str = "",
Expand Down Expand Up @@ -89,6 +90,11 @@ def from_transducer(
Sample rate of the training data used to train the model.
feature_dim:
Dimension of the feature used to train the model.
dither:
Dithering constant (0.0 means no dither).
By default the audio samples are in range [-1,+1],
so dithering constant 0.00003 is a good value,
equivalent to the default 1.0 from kaldi
decoding_method:
Valid values: greedy_search, modified_beam_search.
max_active_paths:
Expand Down Expand Up @@ -142,6 +148,7 @@ def from_transducer(
feat_config = FeatureExtractorConfig(
sampling_rate=sample_rate,
feature_dim=feature_dim,
dither=dither,
)

if len(hotwords_file) > 0 and decoding_method != "modified_beam_search":
Expand Down
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