title: what is the mean of *\ in python?
body: <p>I have searched Python dictionary but nothing came out.</p>
  
  <p>what is the mean of *\ in the below code?</p>
  
  <pre><code>    def __init__(self, input_dim=(1, 28, 28), 
                   conv_param={'filter_num':30, 'filter_size':5, 'pad':0, 'stride':1},
                   hidden_size=100, output_size=10, weight_init_std=0.01):
          filter_num = conv_param['filter_num']
          filter_size = conv_param['filter_size']
          filter_pad = conv_param['pad']
          filter_stride = conv_param['stride']
          input_size = input_dim[1]
          conv_output_size = (input_size - filter_size + 2*filter_pad) / filter_stride + 1
          pool_output_size = int(filter_num * (conv_output_size/2) * (conv_output_size/2))
  
          #weight initialize
          self.params = {}
          self.params['W1'] = weight_init_std * \
                              np.random.randn(filter_num, input_dim[0], 5, 5)
  
  #and so on
  </code></pre>
  
  <p>in</p>
  
  <pre><code>self.params['W1'] = weight_init_std * \
                              np.random.randn(filter_num, input_dim[0], 5, 5)
  </code></pre>
  
  <p>?</p>