We claim the ornamental design for a transformer tablet computer, as shown and described.
FIG. 1 is a top perspective view of a transformer tablet computer in a connected and partially opened state;
FIG. 2 is a top perspective view of the transformer tablet computer in a connected and closed state;
FIG. 3 is top view of the transformer tablet computer of FIG. 1;
FIG. 4 is a right side view of the transformer tablet computer of FIG. 1;
FIG. 5 is a right side view of the transformer tablet computer of FIG. 1 in a closed and disconnected state;
FIG. 6 is a left side view of the transformer tablet computer of FIG. 1 in an open and connected state;
FIG. 7 is a top view of another embodiment of the transformer tablet computer of FIG. 1; and,
FIG. 8 is a top perspective view of the transformer tablet computer of FIG. 7.
The dash-dash broken lines in the drawings are environmental lines which do not form part of the claimed design. The short dash-long dash lines are boundary lines which do not form part of the claimed design.