Have issues converting PYMC code to PYMC3

I am trying to convert PyMC code to PyMC. I didn't find a comprehensive guide on differences and I get an error just changing pymc to pm. I would appreciate the help!

#hyperpriors
home = pymc.Normal('home', 0, .0001, value=0)
tau_att = pymc.Gamma('tau_att', .1, .1, value=10)
tau_def = pymc.Gamma('tau_def', .1, .1, value=10)
intercept = pymc.Normal('intercept', 0, .0001, value=0)

#team-specific parameters
atts_star = pymc.Normal("atts_star", 
                        mu=0, 
                        tau=tau_att, 
                        size=num_teams, 
                        value=att_starting_points.values)
defs_star = pymc.Normal("defs_star", 
                        mu=0, 
                        tau=tau_def, 
                        size=num_teams, 
                        value=def_starting_points.values) 

# trick to code the sum to zero contraint
@pymc.deterministic
def atts(atts_star=atts_star):
    atts = atts_star.copy()
    atts = atts - np.mean(atts_star)
    return atts

@pymc.deterministic
def defs(defs_star=defs_star):
    defs = defs_star.copy()
    defs = defs - np.mean(defs_star)
    return defs