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GPy now fails silently if sympy is not present

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This commit is contained in:
James Hensman 2013-04-22 13:15:39 +01:00
parent 56ecd4782a
commit 698f52e5e3
2 changed files with 37 additions and 27 deletions
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6
GPy/kern/__init__.py
View file

@ -2,5 +2,9 @@
# Licensed under the BSD 3-clause license (see LICENSE.txt)
from constructors import rbf, Matern32, Matern52, exponential, linear, white, bias, finite_dimensional, spline, Brownian, rbf_sympy, sympykern, periodic_exponential, periodic_Matern32, periodic_Matern52, prod, prod_orthogonal, symmetric, coregionalise, rational_quadratic, fixed, rbfcos
from constructors import rbf, Matern32, Matern52, exponential, linear, white, bias, finite_dimensional, spline, Brownian, periodic_exponential, periodic_Matern32, periodic_Matern52, prod, prod_orthogonal, symmetric, coregionalise, rational_quadratic, fixed, rbfcos
try:
from constructors import rbf_sympy, sympykern # these depend on sympy
except:
pass
from kern import kern

58
GPy/kern/constructors.py
View file

@ -165,34 +165,40 @@ def Brownian(D,variance=1.):
part = Brownianpart(D,variance)
return kern(D, [part])
import sympy as sp
from sympykern import spkern
from sympy.parsing.sympy_parser import parse_expr
try:
import sympy as sp
from sympykern import spkern
from sympy.parsing.sympy_parser import parse_expr
sympy_available = True
except ImportError:
sympy_available = False
def rbf_sympy(D,ARD=False,variance=1., lengthscale=1.):
"""
Radial Basis Function covariance.
"""
X = [sp.var('x%i'%i) for i in range(D)]
Z = [sp.var('z%i'%i) for i in range(D)]
rbf_variance = sp.var('rbf_variance',positive=True)
if ARD:
rbf_lengthscales = [sp.var('rbf_lengthscale_%i'%i,positive=True) for i in range(D)]
dist_string = ' + '.join(['(x%i-z%i)**2/rbf_lengthscale_%i**2'%(i,i,i) for i in range(D)])
dist = parse_expr(dist_string)
f = rbf_variance*sp.exp(-dist/2.)
else:
rbf_lengthscale = sp.var('rbf_lengthscale',positive=True)
dist_string = ' + '.join(['(x%i-z%i)**2'%(i,i) for i in range(D)])
dist = parse_expr(dist_string)
f = rbf_variance*sp.exp(-dist/(2*rbf_lengthscale**2))
return kern(D,[spkern(D,f)])
if sympy_available:
def rbf_sympy(D,ARD=False,variance=1., lengthscale=1.):
"""
Radial Basis Function covariance.
"""
X = [sp.var('x%i'%i) for i in range(D)]
Z = [sp.var('z%i'%i) for i in range(D)]
rbf_variance = sp.var('rbf_variance',positive=True)
if ARD:
rbf_lengthscales = [sp.var('rbf_lengthscale_%i'%i,positive=True) for i in range(D)]
dist_string = ' + '.join(['(x%i-z%i)**2/rbf_lengthscale_%i**2'%(i,i,i) for i in range(D)])
dist = parse_expr(dist_string)
f = rbf_variance*sp.exp(-dist/2.)
else:
rbf_lengthscale = sp.var('rbf_lengthscale',positive=True)
dist_string = ' + '.join(['(x%i-z%i)**2'%(i,i) for i in range(D)])
dist = parse_expr(dist_string)
f = rbf_variance*sp.exp(-dist/(2*rbf_lengthscale**2))
return kern(D,[spkern(D,f)])
def sympykern(D,k):
"""
A kernel from a symbolic sympy representation
"""
return kern(D,[spkern(D,k)])
def sympykern(D,k):
"""
A kernel from a symbolic sympy representation
"""
return kern(D,[spkern(D,k)])
del sympy_available
def periodic_exponential(D=1,variance=1., lengthscale=None, period=2*np.pi,n_freq=10,lower=0.,upper=4*np.pi):
"""