public Builder clearConfidence() {
      bitField0_ = (bitField0_ & ~0x00000008);
      confidence_ = 0F;
      onChanged();
      return this;
    }
<pre>
The confidence estimate between 0.0 and 1.0. A higher number
indicates an estimated greater likelihood that the recognized words are
correct. This field is set only for the top alternative of a non-streaming
result or, of a streaming result where
[is_final][google.cloud.speech.v2.StreamingRecognitionResult.is_final] is
set to `true`. This field is not guaranteed to be accurate and users should
not rely on it to be always provided. The default of 0.0 is a sentinel
value indicating `confidence` was not set.
</pre>

<code>float confidence = 4;</code>

@return This builder for chaining.
java-speech/proto-google-cloud-speech-v2/src/main/java/com/google/cloud/speech/v2/WordInfo.java