question in strong labels for evaluation

[yongxuUSTC]

Why is there so many utterance without any label (totally empty)???

For example, the utterance starts from zero and ends also at zero, what does it mean? The problem is my trained model can always detect something, but the label is empty, leading to more insertion errors.

hVvtTC9AmNs_30.000_40.000.wav 0 0 Train

[RicherMans]

Hey there,
I want to emphasize the problem by reporting all the utterances in question ( Overall 36 ). This reduces the amount of overall usable development utterances to 477 ( from 488 )

Wav	Start	End	Label
-Qfk_Q2ctBs_30.000_40.000.wav	0	0	Train horn
5-SzZotiaBU_30.000_40.000.wav	0	0	Car alarm
-x70B12Mb-8_30.000_40.000.wav	0	0	Reversing beeps
0E4AqW9dmdk_30.000_40.000.wav	0	0	Reversing beeps
0OiPtV9sd_w_30.000_40.000.wav	0	0	Reversing beeps
-F1_Gh78vJ0_30.000_40.000.wav	0	0	Bicycle
-RFpDUZhN-g_13.000_23.000.wav	0	0	Bicycle
-fhpkRyZL90_30.000_40.000.wav	0	0	Bicycle
-ngrinYHF4c_30.000_40.000.wav	0	0	Bicycle
--zLzL0sq3M_30.000_40.000.wav	0.000	0.0	Car
--zLzL0sq3M_30.000_40.000.wav	0.000	0.0	Car passing by
-6Yfati1N10_80.000_90.000.wav	0.000	0.000	Motorcycle
-BGebo8V4XY_30.000_40.000.wav	0.000	0.000	Motorcycle
-QMAKXzIGx4_10.000_20.000.wav	0.000	0.000	Motorcycle
-S-5z2vYtxw_10.000_20.000.wav	0.000	0.000	Motorcycle
-1X7kpLnOpM_60.000_70.000.wav	0.000	0.000	Train
-1HlfoHZCEE_6.000_16.000.wav	0.000	0.000	Car
-1McjOPUzbo_30.000_40.000.wav	0.000	0.000	Car
-3929cmVE20_30.000_40.000.wav	0.000	0.000	Car
-AF7wp3ezww_140.000_150.000.wav	0.000	0.000	Car
-Pg4vVPs4bE_30.000_40.000.wav	0.000	0.000	Car
-VULyMtKazE_0.000_7.000.wav	0.000	0.000	Car
-cbYvBBXE6A_12.000_22.000.wav	0.000	0.000	Car
06RreMb5qbE_0.000_10.000.wav	0.000	0.000	Car
7NJ5TbNEIvA_250.000_260.000.wav	0.000	0.000	Car
9fCibkUT_gQ_30.000_40.000.wav	0.000	0.000	Car
-45cKZA7Jww_30.000_40.000.wav	0.000	0.000	Truck
-4B435WQvag_20.000_30.000.wav	0.000	0.000	Truck
-6qhtwdfGOA_23.000_33.000.wav	0.000	0.000	Truck

[MichelleYang2017]

That is to say,delete the samples which the utterance starts from zero and ends also at zero?