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Allow response generation with no user message #310

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Merged
zqhuang211 merged 1 commit into from
Aug 5, 2025
Merged

Allow response generation with no user message #310

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18 changes: 13 additions & 5 deletions ultravox/inference/infer.py
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Original file line number Diff line number Diff line change
Expand Up @@ -57,10 +57,18 @@ def update_conversation(
self.past_key_values = past_key_values

def _get_sample_with_past(
self, sample: datasets.VoiceSample
self, sample: Optional[datasets.VoiceSample] = None
) -> datasets.VoiceSample:
sample = copy.copy(sample)
sample.add_past_messages(self.past_messages)
# Workaround for if we want to generate an assistant response without a user query
if sample is None:
if len(self.past_messages) == 0:
raise ValueError("No past messages available to generate a response.")
sample = datasets.VoiceSample(
self.past_messages,
)
else:
sample = copy.copy(sample)
sample.add_past_messages(self.past_messages)
return sample

def _build_past_messages(
Expand Down Expand Up @@ -116,7 +124,7 @@ def _postprocess_response(self, text: str) -> Tuple[str, Optional[str]]:

def infer(
self,
sample: datasets.VoiceSample,
sample: Optional[datasets.VoiceSample] = None,
max_tokens: Optional[int] = None,
temperature: Optional[float] = None,
) -> base.VoiceOutput:
Expand Down Expand Up @@ -187,7 +195,7 @@ def infer_batch(

def infer_stream(
self,
sample: datasets.VoiceSample,
sample: Optional[datasets.VoiceSample] = None,
max_tokens: Optional[int] = None,
temperature: Optional[float] = None,
) -> base.InferenceGenerator:
Expand Down