Pattern recognition in Spiking Neural Nets using Brian2

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Thank you @kernfel,
I gave 25 circle images for training and 13 images for testing(combined with circle and cross images)
Circle_spike_count = [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 4, 8, 8, 11, 15, 18, 21, 21, 21, 24, 24]
len(circle_spike_count) = 38
And this circle_spike_count was taken via:

circle_spike_count = []
#for i in range(1000):
for train in range(25):
  Syn_inp_hid.learning = True
  Syn_hid_out.learning = True
  izh_output.simulate = True
  izh_cross.v = c

  digit_ta_input = b2.TimedArray([inp_data.T]*(volt/second), dt = 10*ms)

  b2.run(duration)
  circle_spike_count.append(spike_mon_out.num_spikes) #ORG
  


#TESTing the simulation
#for k in range(1000):
for test in range(13):
  Syn_inp_hid.learning = True
  Syn_hid_out.learning = True
   
  idx = [0,0,1,1,0,1,1,1,1,0,0,1,0]    # 46,15%
  #idx = [1,1,1,1,1,1,1,0,0,0,0,0,0]    # 53.84%
  #idx = [0,0,0,0,0,0,1,1,1,1,1,1,1]    # 38.46%
  #idx = [1,1,1,1,1,1,1,1,1,1,1,1,1]   # 0%   because network doesn't know what is cross, and we want to test whether it can recognize circle without giving circle
                                            #we are saying like recognize is it circle or not but giving cross
  #idx = [0,0,0,0,0,0,0,0,0,0,0,0,0]   # 100% because network fed with circle only
  #idx = [1,1,1,1,1,1,1,1,1,1,1,1,0]   # 15%
  #idx = [0,0,0,0,0,0,0,0,0,0,0,0,1]   # 84%
  #idx = [1,0,0,0,0,0,0,0,0,0,0,0,0]
  
  #idx = random.choice([0,1])

  #Circle
  if idx == 0:
    izh_cross.v = c
    izh_circle.v = 0*mV
    izh_output.simulate = True

  #Cross
  elif idx == 1:
    izh_cross.v = 0*mV
    izh_circle.v = c
    izh_output.simulate = False
  inp_data = data[idx[test]]
  digit_ta_input = b2.TimedArray([inp_data.T]*(volt/second), dt = 10*ms)
  b2.run(100*ms)
  circle_spike_count.append(spike_mon_out.num_spikes) #ORG

Ref. taken from @touches,
My question is why neuron fires on testing phase differently? In the training phase, they(circle) fired only once, then why when we give external stimulus (testing phase) fires differently?

Thank you