Detecting Speech Interruptions for Automatic Conflict Detection - Conflict and Multimodal Communication: Social Research and Machine Intelligence - page 384

Table 18.10 Characteristics of the conflict feature sets

# of selected feat.
from Ov features

# of selected feat.
from IS-2013 Feature set Selected feat. set # of selected feat.

Ov-1 and IS-2013
(6,428 features)

Cf-1 315 15 300

Ov-2 and IS-2013
(6,401 features)

Cf-2 335 45 290

Table 18.11 UAR in the
conflict detection task on the
Development set according to
the conflict feature sets

Feature set IS-2013 Cf-1 Cf-2

# of features 6,373 315 335

UAR (devel. set) (%) 79.1 87.4 88.3

The 12th rank of the Cov_H5_O1 feature shows that the f N, L, H g _5 detector is
relevant for the detection of conflict. A total of 36 out of 55 features of the Ov-2 set
have better information gain than those of the IS-2013 set. These results show the
interest of the overlap feature sets for the detection of conflict.

18.5.3 Conflict Feature Sets

From two initial feature sets (Ov-1 and IS-2013 and Ov-2 and IS-2013), two conflict
feature sets (Cf-1 and Cf-2) were selected by a backward selection algorithm when
maximizing UAR on the Development set for the conflict detection task. Table 18.10
gives the characteristics of the Cf-1 and Cf-2 sets of the conflict detector using these
feature sets. The Cf-1 feature set consists of 315 features (15 features from the Ov-1
set and 300 features from the IS2013 set). The Cf-2 feature set consists of 335
features (45 features from Ov-2 set and 290 features from the IS2013-set).
Table 18.11 gives the accuracy (UAR in %) of the conflict detection on the
Development set using the various feature sets (IS-2013, Cf-1, Cf-2). The results
show an improvement of 8.3 % using the Cf-1 set and 9.2 % using the Cf-2 set on
the Development set compared to the baseline results that use the IS-2013 set (UAR
of 79.1 %). These results show also that the majority of the features of the Cf-2 set
are relevant and not redundant. It confirms that the two types of detectors ( f N, L, H g
and f N, O g ) are relevant for the detection of conflict.

18.5.4 Conflict Detectors

Two conflict detectors have been developed. Figure 18.10 resumes the architecture
characteristics of the first conflict detector, called the simple overlap-based conflict
detector (SO-conflict detector). This detector was based on a set of overlap detectors