class_docstr: Instance of the pricing problem
docstr: Evaluate all singleton solutions (adding one literal)
code: def eval_singletons(self, lambda1):
      """Evaluate all singleton solutions (adding one literal)"""
      self.Rp = np.dot(self.rp, self.Xp)
      self.Rn = np.dot(self.rn, self.Xn)
      self.v1 = self.v0 - self.Rp - self.Rn + lambda1
      self.v1 = pd.Series(self.v1, index=self.Xp.columns)
  
file_path: AIX360/aix360/algorithms/rbm/beam_search.py
imports: import numpy
  import pandas
label_desc: Use image node_id 2 for calling the PricingInstance obj's underlying member method code with example usage: obj.eval_singletons(lambda1) without return types