class_docstr: Instance of the pricing problem.
  
  For more details, see:
  
  Dash, S., Gunluk, O., and Wei, D. (2018). Boolean decision rules via column generation.
  In Bengio, S., Wallach, H., Larochelle, H., Grauman, K., Cesa- Bianchi, N.,
  and Garnett, R., editors, Advances in Neural Information Processing Systems 31,
  pages 4660–4670. Curran Associates, Inc.
docstr: Evaluate all singleton solutions (adding one literal)
docstr_tok: ["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)
  
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