message: fixing benchmark heatmap title generation with underscores
diff: @@ -134,7 +134,7 @@ class QPT(Benchmark):
  plt.colorbar(im2, fraction=0.045, pad=0.05, ax=ax2)
  ax2.set_ylim(chi.shape[0]-0.5, -0.5)
  - fig.suptitle(self.circuit_name + ' quantum process tomography on ' + self.qpu.name())
  + fig.suptitle(self.circuit_name.replace('_','') + ' quantum process tomography on ' + self.qpu.name())
  fig.tight_layout()
  from datetime import datetime
  now = datetime.now() # current date and time
  