def debug_laplace():
# Load data set
X, y, D, Xtest, ytest = gpml.load_mat(
'../data/kfold_data/r_concrete_500_fold_10_of_10.mat', y_dim=1)
# Load the suspicious kernel
sk = fk.repr_string_to_kernel(
'ScoredKernel(k_opt=ProductKernel([ MaskKernel(ndim=8, active_dimension=0, base_kernel=CubicKernel(offset=1.757755, output_variance=7.084045)), MaskKernel(ndim=8, active_dimension=7, base_kernel=SqExpPeriodicKernel(lengthscale=-2.701080, period=-0.380918, output_variance=-0.071214)) ]), nll=6348.096611, laplace_nle=-184450132.068237, bic_nle=12720.630212, noise=[-1.77276072])'
)
# Create some code to evaluate it
if X.ndim == 1: X = X[:, nax]
if y.ndim == 1: y = y[:, nax]
ndata = y.shape[0]
# Create data file
data_file = cblparallel.create_temp_file('.mat')
scipy.io.savemat(data_file, {'X': X, 'y': y}) # Save regression data
# Move to fear
cblparallel.copy_to_remote(data_file)
scripts = [
gpml.OPTIMIZE_KERNEL_CODE % {
'datafile':
data_file.split('/')[-1],
'writefile':
'%(output_file)s', # N.B. cblparallel manages output files
'gpml_path':
cblparallel.gpml_path(local_computation=False),
'kernel_family':
sk.k_opt.gpml_kernel_expression(),
'kernel_params':
'[ %s ]' % ' '.join(str(p) for p in sk.k_opt.param_vector()),
'noise':
str(sk.noise),
'iters':
str(300)
}
]
#### Need to be careful with % signs
#### For the moment, cblparallel expects no single % signs - FIXME
scripts[0] = re.sub('% ', '%% ', scripts[0])
# Test
scripts[0] = re.sub('delta = 1e-6', 'delta = 1e-6', scripts[0])
#scripts[0] = re.sub('hyp.lik = [-1.77276072]', 'hyp.lik = [-0.77276072]', scripts[0])
output_file = cblparallel.run_batch_on_fear(scripts,
language='matlab',
max_jobs=600)[0]
# Read in results
output = gpml.read_outputs(output_file)
result = ScoredKernel.from_matlab_output(output, sk.k_opt.family(), ndata)
print result
print output.hessian
os.remove(output_file)
# Remove temporary data file (perhaps on the cluster server)
cblparallel.remove_temp_file(data_file, local_computation=False)
def debug_laplace():
# Load data set
X, y, D, Xtest, ytest = gpml.load_mat('../data/kfold_data/r_concrete_500_fold_10_of_10.mat', y_dim=1)
# Load the suspicious kernel
sk = fk.repr_string_to_kernel('ScoredKernel(k_opt=ProductKernel([ MaskKernel(ndim=8, active_dimension=0, base_kernel=CubicKernel(offset=1.757755, output_variance=7.084045)), MaskKernel(ndim=8, active_dimension=7, base_kernel=SqExpPeriodicKernel(lengthscale=-2.701080, period=-0.380918, output_variance=-0.071214)) ]), nll=6348.096611, laplace_nle=-184450132.068237, bic_nle=12720.630212, noise=[-1.77276072])')
# Create some code to evaluate it
if X.ndim == 1: X = X[:, nax]
if y.ndim == 1: y = y[:, nax]
ndata = y.shape[0]
# Create data file
data_file = cblparallel.create_temp_file('.mat')
scipy.io.savemat(data_file, {'X': X, 'y': y}) # Save regression data
# Move to fear
cblparallel.copy_to_remote(data_file)
scripts = [gpml.OPTIMIZE_KERNEL_CODE % {'datafile': data_file.split('/')[-1],
'writefile': '%(output_file)s', # N.B. cblparallel manages output files
'gpml_path': cblparallel.gpml_path(local_computation=False),
'kernel_family': sk.k_opt.gpml_kernel_expression(),
'kernel_params': '[ %s ]' % ' '.join(str(p) for p in sk.k_opt.param_vector()),
'noise': str(sk.noise),
'iters': str(300)}]
#### Need to be careful with % signs
#### For the moment, cblparallel expects no single % signs - FIXME
scripts[0] = re.sub('% ', '%% ', scripts[0])
# Test
scripts[0] = re.sub('delta = 1e-6', 'delta = 1e-6', scripts[0])
#scripts[0] = re.sub('hyp.lik = [-1.77276072]', 'hyp.lik = [-0.77276072]', scripts[0])
output_file = cblparallel.run_batch_on_fear(scripts, language='matlab', max_jobs=600)[0]
# Read in results
output = gpml.read_outputs(output_file)
result = ScoredKernel.from_matlab_output(output, sk.k_opt.family(), ndata)
print result
print output.hessian
os.remove(output_file)
# Remove temporary data file (perhaps on the cluster server)
cblparallel.remove_temp_file(data_file, local_computation=False)
def evaluate_kernels(kernels,
X,
y,
verbose=True,
noise=None,
iters=300,
local_computation=False,
zip_files=False,
max_jobs=500,
zero_mean=False,
random_seed=0):
'''
Sets up the kernel optimisation and nll calculation experiments, returns the results as scored kernels
Input:
- kernels - A list of kernels (i.e. not scored kernels)
- X - A matrix (data_points x dimensions) of input locations
- y - A matrix (data_points x 1) of output values
- ...
Return:
- A list of ScoredKernel objects
'''
# Make data into matrices in case they're unidimensional.
if X.ndim == 1: X = X[:, nax]
if y.ndim == 1: y = y[:, nax]
ndata = y.shape[0]
# Set default noise using a heuristic.
if noise is None:
noise = np.log(np.var(y) / 10)
# Create data file
if verbose:
print 'Creating data file locally'
data_file = cblparallel.create_temp_file('.mat')
scipy.io.savemat(data_file, {'X': X, 'y': y}) # Save regression data
# Move to fear if necessary
if not local_computation:
if verbose:
print 'Moving data file to fear'
cblparallel.copy_to_remote(data_file)
# Create a list of MATLAB scripts to assess and optimise parameters for each kernel
if verbose:
print 'Creating scripts'
scripts = [None] * len(kernels)
for (i, kernel) in enumerate(kernels):
x = kernel.param_vector()
parameters = {
'datafile':
data_file.split('/')[-1],
'writefile':
'%(output_file)s', # N.B. cblparallel manages output files
'gpml_path':
cblparallel.gpml_path(local_computation),
'kernel_family':
kernel.gpml_kernel_expression(),
'kernel_params':
'[ %s ]' % ' '.join(str(p) for p in x if type(p) != list),
'eff_dimensions':
'[ %s ]' % ';'.join(str(p) for p in x if type(p) == list),
'dim_positions':
'[ %s ]' %
' '.join(str(i) for i in range(len(x)) if type(x[i]) == list),
'noise':
str(noise),
'iters':
str(iters),
'seed':
str(random_seed)
}
print parameters['kernel_params'], parameters[
'eff_dimensions'], parameters['dim_positions']
if zero_mean:
scripts[i] = gpml.OPTIMIZE_KERNEL_CODE_ZERO_MEAN % parameters
else:
scripts[i] = gpml.OPTIMIZE_KERNEL_CODE % parameters
#### Need to be careful with % signs
#### For the moment, cblparallel expects no single % signs - FIXME
scripts[i] = re.sub('% ', '%% ', scripts[i])
# Send to cblparallel and save output_files
if verbose:
print 'Sending scripts to cblparallel'
if local_computation:
output_files = cblparallel.run_batch_locally(scripts,
language='matlab',
max_cpu=1.1,
job_check_sleep=5,
submit_sleep=0.1,
max_running_jobs=10,
verbose=verbose)
else:
output_files = cblparallel.run_batch_on_fear(scripts,
language='matlab',
max_jobs=max_jobs,
verbose=verbose,
zip_files=zip_files)
# Read in results
results = [None] * len(kernels)
for (i, output_file) in enumerate(output_files):
if verbose:
print 'Reading output file %d of %d: %s' % (i + 1, len(kernels),
output_file)
results[i] = ScoredKernel.from_matlab_output(
gpml.read_outputs(output_file), kernels[i].family(), ndata)
# Tidy up local output files
for (i, output_file) in enumerate(output_files):
if verbose:
print 'Removing output file %d of %d' % (i + 1, len(kernels))
os.remove(output_file)
# Remove temporary data file (perhaps on the cluster server)
cblparallel.remove_temp_file(data_file, local_computation)
# Return results i.e. list of ScoredKernel objects
return results
def evaluate_kernels(kernels, X, y, verbose=True, noise=None, iters=300, local_computation=False, zip_files=False, max_jobs=500, zero_mean=False, random_seed=0):
'''
Sets up the kernel optimisation and nll calculation experiments, returns the results as scored kernels
Input:
- kernels - A list of kernels (i.e. not scored kernels)
- X - A matrix (data_points x dimensions) of input locations
- y - A matrix (data_points x 1) of output values
- ...
Return:
- A list of ScoredKernel objects
'''
# Make data into matrices in case they're unidimensional.
if X.ndim == 1: X = X[:, nax]
if y.ndim == 1: y = y[:, nax]
ndata = y.shape[0]
# Set default noise using a heuristic.
if noise is None:
noise = np.log(np.var(y)/10)
# Create data file
if verbose:
print 'Creating data file locally'
data_file = cblparallel.create_temp_file('.mat')
scipy.io.savemat(data_file, {'X': X, 'y': y}) # Save regression data
# Move to fear if necessary
if not local_computation:
if verbose:
print 'Moving data file to fear'
cblparallel.copy_to_remote(data_file)
# Create a list of MATLAB scripts to assess and optimise parameters for each kernel
if verbose:
print 'Creating scripts'
scripts = [None] * len(kernels)
for (i, kernel) in enumerate(kernels):
parameters = {'datafile': data_file.split('/')[-1],
'writefile': '%(output_file)s', # N.B. cblparallel manages output files
'gpml_path': cblparallel.gpml_path(local_computation),
'kernel_family': kernel.gpml_kernel_expression(),
'kernel_params': '[ %s ]' % ' '.join(str(p) for p in kernel.param_vector()),
'noise': str(noise),
'iters': str(iters),
'seed': str(random_seed)}
if zero_mean:
scripts[i] = gpml.OPTIMIZE_KERNEL_CODE_ZERO_MEAN % parameters
else:
scripts[i] = gpml.OPTIMIZE_KERNEL_CODE % parameters
#### Need to be careful with % signs
#### For the moment, cblparallel expects no single % signs - FIXME
scripts[i] = re.sub('% ', '%% ', scripts[i])
# Send to cblparallel and save output_files
if verbose:
print 'Sending scripts to cblparallel'
if local_computation:
output_files = cblparallel.run_batch_locally(scripts, language='matlab', max_cpu=1.1, job_check_sleep=5, submit_sleep=0.1, max_running_jobs=10, verbose=verbose)
else:
output_files = cblparallel.run_batch_on_fear(scripts, language='matlab', max_jobs=max_jobs, verbose=verbose, zip_files=zip_files)
# Read in results
results = [None] * len(kernels)
for (i, output_file) in enumerate(output_files):
if verbose:
print 'Reading output file %d of %d' % (i + 1, len(kernels))
results[i] = ScoredKernel.from_matlab_output(gpml.read_outputs(output_file), kernels[i].family(), ndata)
# Tidy up local output files
for (i, output_file) in enumerate(output_files):
if verbose:
print 'Removing output file %d of %d' % (i + 1, len(kernels))
os.remove(output_file)
# Remove temporary data file (perhaps on the cluster server)
cblparallel.remove_temp_file(data_file, local_computation)
# Return results i.e. list of ScoredKernel objects
return results