class_docstr: Zero mean function for Gaussian process.
class_docstr_tok: ["Zero","mean","function","for","Gaussian","process","."]
code: def __call__(self, X):
      return pt.alloc(0.0, X.shape[0])
  
imports: import pytensor.tensor
label_desc: Use image node_id 1 for calling the Zero obj's underlying member method code with example usage: obj.__call__(X) and returns: pt