Be stars are B-type main-sequence stars that display broad Balmer emission lines in their spectra. Identification of the Be population is essential to further examine the formation and evolutionary models. We report the detection of classical Be (CBe) stars from observations with the Large sky Area Multi- Object fiber Spectroscopic Telescope Medium Resolution Survey Data Release 7 (LAMOST MRS DR7). We used a deep convolutional neural network, ResNet, with an 18 layer module to examine the morphology of the H{alpha} profile. We identified 1162 candidate Be stars from the collection of 2,260,387 spectra for 789,918 stars in the database. The ResNet network achieves a Be-star classification accuracy of 99.5%. Among the detections, 151 of these are prior known Be stars crossmatched from the literature. By applying a three-step test, we identified 183 new CBe stars. We find that 41 CBe stars are members of known open clusters. Based on an investigation of the kinematics of the identified CBe stars from the Gaia EDR3 astrometric solutions, we identified 16 new runaways. These new identifications will provide a reference for future follow-ups to further investigate their physical properties.

Cone search capability for table J/ApJS/260/35/table2 (Be candidate spectra selected for the training sample)

Cone search capability for table J/ApJS/260/35/table3 (Non-Be candidate spectra selected for the training sample)

Cone search capability for table J/ApJS/260/35/table5 (Oe stars found from the LAMOST MRS DR7 sample)

Cone search capability for table J/ApJS/260/35/table6 (Known Be stars found from the MRS sample)

Cone search capability for table J/ApJS/260/35/table7 (Newly identified classical Be (CBe) stars from the LAMOST MRS DR7 sample)

Cone search capability for table J/ApJS/260/35/table8 (Open cluster memberships for identified CBe stars from the LAMOST MRS DR7 sample)

Cone search capability for table J/ApJS/260/35/table9 (The peculiar velocities of the 16 runaway CBe stars identified from the LAMOST MRS DR7 sample)

Cone search capability for table J/ApJS/260/35/tablea1 (Candidate Be stars displaying Ha emission profiles with absorption shell line identified from the LAMOST MRS DR7 sample)

Cone search capability for table J/ApJS/260/35/tablea2 (Candidate Be stars displaying Ha absorption profiles with shell line identified from the LAMOST MRS DR7 sample)