If Taiwanese director Tsai Ming-liang threw a dinner party, it's easy to guess who would be invited. Tsai has staunchly and consistently worked with the same small cluster of actors from his 1992 debut film "Rebels of the Neon God" through to "Stray Dogs," which will open in Tokyo on Sept. 6, under the Japan title "Picnic." Some of these actors are closer to him than family.