import pystan
model_code = """
data {
  int n;                                
  int m;                                
  matrix[n, m] A;
  vector[n] y;
}

parameters {
  vector[m] delta;
}

model {y ~ normal(A * delta,1);}
"""
model = pystan.StanModel(model_code=model_code)
import pystan
model_code = """
data {
  int n;                                
  int m;                                
  matrix[n, m] A;
  vector[n] y;
}

parameters {
  vector[m] delta;
}

model {y ~ normal(A * delta,1);}
"""
model = pystan.StanModel(model_code=model_code)
data {
   int n;                                
   int m;                                
   matrix[n, m] A;
   vector[n] y;
 }
 
 parameters {
   vector[m] delta;
 }
 
 model {y ~ normal(A * delta,1);}