public Builder clearConfidence() {
      bitField0_ = (bitField0_ & ~0x00000008);
      confidence_ = 0F;
      onChanged();
      return this;
    }
<pre>
Object category's labeling confidence of this track.
</pre>

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

@return This builder for chaining.
java-video-intelligence/proto-google-cloud-video-intelligence-v1/src/main/java/com/google/cloud/videointelligence/v1/ObjectTrackingAnnotation.java