def simple_device(verbose=False):
display_func = _util.display_func(verbose)
print_func = _util.print_func(verbose)
print_func(af.device_info())
print_func(af.get_device_count())
print_func(af.is_dbl_supported())
af.sync()
dev = af.get_device()
print_func(dev)
for k in range(af.get_device_count()):
af.set_device(k)
dev = af.get_device()
assert (k == dev)
print_func(af.is_dbl_supported(k))
af.device_gc()
mem_info_old = af.device_mem_info()
a = af.randu(100, 100)
af.sync(dev)
mem_info = af.device_mem_info()
assert (mem_info['alloc']['buffers'] == 1 +
mem_info_old['alloc']['buffers'])
assert (mem_info['lock']['buffers'] == 1 +
mem_info_old['lock']['buffers'])
af.set_device(dev)
def simple_device(verbose=False):
display_func = _util.display_func(verbose)
print_func = _util.print_func(verbose)
print_func(af.device_info())
print_func(af.get_device_count())
print_func(af.is_dbl_supported())
af.sync()
dev = af.get_device()
print_func(dev)
for k in range(af.get_device_count()):
af.set_device(k)
dev = af.get_device()
assert(k == dev)
print_func(af.is_dbl_supported(k))
af.device_gc()
mem_info_old = af.device_mem_info()
a = af.randu(100, 100)
af.sync(dev)
mem_info = af.device_mem_info()
assert(mem_info['alloc']['buffers'] == 1 + mem_info_old['alloc']['buffers'])
assert(mem_info[ 'lock']['buffers'] == 1 + mem_info_old[ 'lock']['buffers'])
af.set_device(dev)
def simple_device(verbose=False):
display_func = _util.display_func(verbose)
print_func = _util.print_func(verbose)
print_func(af.device_info())
print_func(af.get_device_count())
print_func(af.is_dbl_supported())
af.sync()
curr_dev = af.get_device()
print_func(curr_dev)
for k in range(af.get_device_count()):
af.set_device(k)
dev = af.get_device()
assert(k == dev)
print_func(af.is_dbl_supported(k))
af.device_gc()
mem_info_old = af.device_mem_info()
a = af.randu(100, 100)
af.sync(dev)
mem_info = af.device_mem_info()
assert(mem_info['alloc']['buffers'] == 1 + mem_info_old['alloc']['buffers'])
assert(mem_info[ 'lock']['buffers'] == 1 + mem_info_old[ 'lock']['buffers'])
af.set_device(curr_dev)
a = af.randu(10,10)
display_func(a)
dev_ptr = af.get_device_ptr(a)
print_func(dev_ptr)
b = af.Array(src=dev_ptr, dims=a.dims(), dtype=a.dtype(), is_device=True)
display_func(b)
c = af.randu(10,10)
af.lock_array(c)
af.unlock_array(c)
a = af.constant(1, 3, 3)
b = af.constant(2, 3, 3)
af.eval(a)
af.eval(b)
print_func(a)
print_func(b)
c = a + b
d = a - b
af.eval(c, d)
print_func(c)
print_func(d)
print_func(af.set_manual_eval_flag(True))
assert(af.get_manual_eval_flag() == True)
print_func(af.set_manual_eval_flag(False))
assert(af.get_manual_eval_flag() == False)
display_func(af.is_locked_array(a))
def gpuGridrec(tomo,angles,center,input_params):
"""
Gridrec reconstruction using GPU based gridding
Inputs: tomo : 3D numpy sinogram array with dimensions same as tomopy
angles : Array of angles in radians
center : Floating point center of rotation
input_params : A dictionary with the keys
'gpu_device' : Device id of the gpu (For a 4 GPU cluster ; 0-3)
'oversamp_factor': A factor by which to pad the image/data for FFT
'fbp_filter_param' : A number between 0-1 for setting the filter cut-off for FBP
"""
print('Starting GPU NUFFT recon')
#allocate space for final answer
af.set_device(input_params['gpu_device']) #Set the device number for gpu based code
#Change tomopy format
new_tomo=np.transpose(tomo,(1,2,0)) #slice, columns, angles
im_size = new_tomo.shape[1]
num_slice = new_tomo.shape[0]
num_angles=new_tomo.shape[2]
pad_size=np.int16(im_size*input_params['oversamp_factor'])
# nufft_scaling = (np.pi/pad_size)**2
#Initialize structures for NUFFT
sino={}
geom={}
sino['Ns'] = pad_size#Sinogram size after padding
sino['Ns_orig'] = im_size #size of original sinogram
sino['center'] = center + (sino['Ns']/2 - sino['Ns_orig']/2) #for padded sinogram
sino['angles'] = angles
sino['filter'] = input_params['fbp_filter_param'] #Paramter to control strength of FBP filter normalized to [0,1]
#Initialize NUFFT parameters
nufft_params = init_nufft_params(sino,geom)
rec_nufft = afnp.zeros((num_slice/2,sino['Ns_orig'],sino['Ns_orig']),dtype=afnp.complex64)
Ax = afnp.zeros((sino['Ns'],num_angles),dtype=afnp.complex64)
pad_idx = slice(sino['Ns']/2-sino['Ns_orig']/2,sino['Ns']/2+sino['Ns_orig']/2)
rec_nufft_final=np.zeros((num_slice,sino['Ns_orig'],sino['Ns_orig']),dtype=np.float32)
#Move all data to GPU
slice_1=slice(0,num_slice,2)
slice_2=slice(1,num_slice,2)
gdata=afnp.array(new_tomo[slice_1]+1j*new_tomo[slice_2],dtype=afnp.complex64)
x_recon = afnp.zeros((sino['Ns'],sino['Ns']),dtype=afnp.complex64)
#loop over all slices
for i in range(0,num_slice/2):
Ax[pad_idx,:]=gdata[i]
#filtered back-projection
rec_nufft[i] = (back_project(Ax,nufft_params))[pad_idx,pad_idx]
#Move to CPU
#Rescale result to match tomopy
rec_nufft=np.array(rec_nufft,dtype=np.complex64) #*nufft_scaling
rec_nufft_final[slice_1]=np.array(rec_nufft.real,dtype=np.float32)
rec_nufft_final[slice_2]=np.array(rec_nufft.imag,dtype=np.float32)
return rec_nufft_final
def main():
parser = argparse.ArgumentParser(
description='af vs sklearn logit comparison')
parser.add_argument('-b',
'--backend',
choices=['default', 'cpu', 'cuda', 'opencl'],
default='default',
action='store',
help='ArrayFire backend to be used')
parser.add_argument('-v',
'--device',
type=int,
default=0,
action='store',
help='ArrayFire backend device to be used')
parser.add_argument('-d',
'--dataset',
choices=['iris', 'mnist', 'notmnist'],
default='iris',
action='store',
help='Dataset to be used')
parser.add_argument('-t',
'--type',
choices=['simple', 'predict', 'benchmark'],
default='simple',
action='store',
help='Demo type')
args = parser.parse_args()
af.set_backend(args.backend)
af.set_device(args.device)
af.info()
dataset = None
if args.dataset == 'iris':
dataset = read_and_preprocess_iris_data()
elif args.dataset == 'mnist':
dataset = read_and_preprocess_mnist_data()
elif args.dataset == 'notmnist':
dataset = read_and_preprocess_notmnist_data()
else:
parser.print_help()
return -1
print('------------')
if args.type == 'simple':
demo_simple(arrayfire_knn_demo, sklearn_knn_demo, dataset)
elif args.type == 'predict':
demo_pred(arrayfire_knn_demo, sklearn_knn_demo, dataset)
elif args.type == 'benchmark':
demo_bench(arrayfire_knn_demo, sklearn_knn_demo, dataset)
else:
parser.print_help()
return -1
def _get_compute_device_internal(id: int) -> ComputeDevice:
af.set_device(id)
device_info = af.device_info()
name = device_info['device']
backend = device_info['backend']
toolkit_version = device_info['toolkit']
compute_version = device_info['compute']
return ComputeDevice(id, name, backend, toolkit_version,
compute_version)
def set_compute_device(compute_device: tp.Union[int, ComputeDevice]) \
-> None:
if isinstance(compute_device, int):
compute_device \
= ComputeDeviceManager.get_compute_device(compute_device)
elif not isinstance(compute_device, ComputeDevice):
raise TypeError(f"The argument compute_device must be of "
f"type ComputeDevice or of type int. The argument "
f"provided is of type {type(compute_device)}")
af.set_device(compute_device.id)
def get_compute_devices(cls) -> tp.Sequence[ComputeDevice]:
if ComputeDeviceManager._compute_devices is None:
saved_device_id = cls.get_current_compute_device_id()
n = af.get_device_count()
ComputeDeviceManager._compute_devices = []
for id in range(n):
(ComputeDeviceManager._compute_devices.append(
ComputeDeviceManager._get_compute_device_internal(id)))
af.set_device(saved_device_id)
return ComputeDeviceManager._compute_devices
def main():
argc = len(sys.argv)
device = int(sys.argv[1]) if argc > 1 else 0
console = sys.argv[2][0] == '-' if argc > 2 else False
perc = int(sys.argv[3]) if argc > 3 else 60
try:
af.set_device(device)
af.info()
logit_demo(console, perc)
except Exception as e:
print('Error: ', str(e))
def gpuGridrec(tomo, angles, center, input_params):
print('Starting GPU NUFFT recon')
#allocate space for final answer
af.set_device(
input_params['gpu_device']) #Set the device number for gpu based code
#Change tomopy format
new_tomo = np.transpose(tomo, (1, 2, 0)) #slice, columns, angles
im_size = new_tomo.shape[1]
num_slice = new_tomo.shape[0]
num_angles = new_tomo.shape[2]
pad_size = np.int16(im_size * input_params['oversamp_factor'])
nufft_scaling = (np.pi / pad_size)**2
#Initialize structures for NUFFT
sino = {}
geom = {}
sino['Ns'] = pad_size #Sinogram size after padding
sino['Ns_orig'] = im_size #size of original sinogram
sino['center'] = center + (sino['Ns'] / 2 - sino['Ns_orig'] / 2
) #for padded sinogram
sino['angles'] = angles
sino['filter'] = input_params[
'fbp_filter_param'] #Paramter to control strength of FBP filter normalized to [0,1]
#Initialize NUFFT parameters
nufft_params = init_nufft_params(sino, geom)
rec_nufft = afnp.zeros((num_slice / 2, sino['Ns_orig'], sino['Ns_orig']),
dtype=afnp.complex64)
Ax = afnp.zeros((sino['Ns'], num_angles), dtype=afnp.complex64)
pad_idx = slice(sino['Ns'] / 2 - sino['Ns_orig'] / 2,
sino['Ns'] / 2 + sino['Ns_orig'] / 2)
rec_nufft_final = np.zeros((num_slice, sino['Ns_orig'], sino['Ns_orig']),
dtype=np.float32)
#Move all data to GPU
slice_1 = slice(0, num_slice, 2)
slice_2 = slice(1, num_slice, 2)
gdata = afnp.array(new_tomo[slice_1] + 1j * new_tomo[slice_2],
dtype=afnp.complex64)
x_recon = afnp.zeros((sino['Ns'], sino['Ns']), dtype=afnp.complex64)
#loop over all slices
for i in range(0, num_slice / 2):
Ax[pad_idx, :] = gdata[i]
#filtered back-projection
rec_nufft[i] = (back_project(Ax, nufft_params))[pad_idx, pad_idx]
#Move to CPU
#Rescale result to match tomopy
rec_nufft = np.array(rec_nufft, dtype=np.complex64) * nufft_scaling
rec_nufft_final[slice_1] = np.array(rec_nufft.real, dtype=np.float32)
rec_nufft_final[slice_2] = np.array(rec_nufft.imag, dtype=np.float32)
return rec_nufft_final
def simple_device(verbose=False):
display_func = _util.display_func(verbose)
print_func = _util.print_func(verbose)
print_func(af.device_info())
print_func(af.get_device_count())
print_func(af.is_dbl_supported())
af.sync()
curr_dev = af.get_device()
print_func(curr_dev)
for k in range(af.get_device_count()):
af.set_device(k)
dev = af.get_device()
assert (k == dev)
print_func(af.is_dbl_supported(k))
af.device_gc()
mem_info_old = af.device_mem_info()
a = af.randu(100, 100)
af.sync(dev)
mem_info = af.device_mem_info()
assert (mem_info['alloc']['buffers'] == 1 +
mem_info_old['alloc']['buffers'])
assert (mem_info['lock']['buffers'] == 1 +
mem_info_old['lock']['buffers'])
af.set_device(curr_dev)
a = af.randu(10, 10)
display_func(a)
dev_ptr = af.get_device_ptr(a)
print_func(dev_ptr)
b = af.Array(src=dev_ptr, dims=a.dims(), dtype=a.dtype(), is_device=True)
display_func(b)
af.lock_device_ptr(b)
af.unlock_device_ptr(b)
def simple_device(verbose=False):
display_func = _util.display_func(verbose)
print_func = _util.print_func(verbose)
print_func(af.device_info())
print_func(af.get_device_count())
print_func(af.is_dbl_supported())
af.sync()
curr_dev = af.get_device()
print_func(curr_dev)
for k in range(af.get_device_count()):
af.set_device(k)
dev = af.get_device()
assert(k == dev)
print_func(af.is_dbl_supported(k))
af.device_gc()
mem_info_old = af.device_mem_info()
a = af.randu(100, 100)
af.sync(dev)
mem_info = af.device_mem_info()
assert(mem_info['alloc']['buffers'] == 1 + mem_info_old['alloc']['buffers'])
assert(mem_info[ 'lock']['buffers'] == 1 + mem_info_old[ 'lock']['buffers'])
af.set_device(curr_dev)
a = af.randu(10,10)
display_func(a)
dev_ptr = af.get_device_ptr(a)
print_func(dev_ptr)
b = af.Array(src=dev_ptr, dims=a.dims(), dtype=a.dtype(), is_device=True)
display_func(b)
af.lock_device_ptr(b)
af.unlock_device_ptr(b)
def __init__(self, physical_system, performance_test_flag = False):
"""
Constructor for the nonlinear_solver object. It takes the physical
system object as an argument and uses it in intialization and
evolution of the system in consideration.
Additionally, a performance test flag is also passed which when true,
stores time which is consumed by each of the major solver routines.
This proves particularly useful in analyzing performance bottlenecks
and obtaining benchmarks.
Parameters:
-----------
physical_system: object
The defined physical system object which holds
all the simulation information such as the initial
conditions, and the domain info is passed as an
argument in defining an instance of the
nonlinear_solver. This system is then evolved, and
monitored using the various methods under the
nonlinear_solver class.
performance_test_flag: bool
When set to true, the time elapsed in each of the
solver routines is measured. These performance
stats can be obtained at the end of the run using
the command print_performance_timings, which summarizes
the results in a table.
"""
self.physical_system = physical_system
# Holding Domain Info:
self.q1_start, self.q1_end = physical_system.q1_start,\
physical_system.q1_end
self.q2_start, self.q2_end = physical_system.q2_start,\
physical_system.q2_end
self.p1_start, self.p1_end = physical_system.p1_start,\
physical_system.p1_end
self.p2_start, self.p2_end = physical_system.p2_start,\
physical_system.p2_end
self.p3_start, self.p3_end = physical_system.p3_start,\
physical_system.p3_end
# Holding Domain Resolution:
self.N_q1, self.dq1 = physical_system.N_q1, physical_system.dq1
self.N_q2, self.dq2 = physical_system.N_q2, physical_system.dq2
self.N_p1, self.dp1 = physical_system.N_p1, physical_system.dp1
self.N_p2, self.dp2 = physical_system.N_p2, physical_system.dp2
self.N_p3, self.dp3 = physical_system.N_p3, physical_system.dp3
# Getting number of ghost zones, and the boundary
# conditions that are utilized:
N_g = self.N_ghost = physical_system.N_ghost
self.boundary_conditions = physical_system.boundary_conditions
# MPI Communicator:
self._comm = self.physical_system.mpi_communicator
if(self.physical_system.params.num_devices>1):
rank = self._comm.rank
if (self.physical_system.params.manual_device_allocation == True):
af.set_device(self.physical_system.params.device_allocation[rank])
else:
af.set_device(rank%self.physical_system.params.num_devices)
# Getting number of species:
N_s = self.N_species = self.physical_system.N_species
# TODO: Remove mass and charge from lib
if(type(physical_system.params.mass) == list):
# Having a temporary copy of the lists to copy to af.Array:
list_mass = physical_system.params.mass.copy()
list_charge = physical_system.params.charge.copy()
# Initializing af.Arrays for mass and charge:
# Having the mass and charge along axis 1:
self.physical_system.params.mass = af.constant(0, 1, N_s, dtype = af.Dtype.f64)
self.physical_system.params.charge = af.constant(0, 1, N_s, dtype = af.Dtype.f64)
for i in range(N_s):
self.physical_system.params.mass[0, i] = list_mass[i]
self.physical_system.params.charge[0, i] = list_charge[i]
self.physical_system.params.rank = self._comm.rank
PETSc.Sys.Print('\nBackend Details for Nonlinear Solver:')
# Printing the backend details for each rank/device/node:
PETSc.Sys.syncPrint(indent('Rank ' + str(self._comm.rank) + ' of ' + str(self._comm.size-1)))
PETSc.Sys.syncPrint(indent('On Node: '+ socket.gethostname()))
PETSc.Sys.syncPrint(indent('Device Details:'))
PETSc.Sys.syncPrint(indent(af.info_str(), 2))
PETSc.Sys.syncPrint(indent('Device Bandwidth = ' + str(bandwidth_test(100)) + ' GB / sec'))
PETSc.Sys.syncPrint()
PETSc.Sys.syncFlush()
self.performance_test_flag = performance_test_flag
# Initializing variables which are used to time the components of the solver:
if(performance_test_flag == True):
self.time_ts = 0
self.time_interp2 = 0
self.time_sourcets = 0
self.time_fvm_solver = 0
self.time_reconstruct = 0
self.time_riemann = 0
self.time_fieldstep = 0
self.time_interp3 = 0
self.time_apply_bcs_f = 0
self.time_communicate_f = 0
petsc_bc_in_q1 = 'ghosted'; self.N_g1 = self.N_ghost
petsc_bc_in_q2 = 'ghosted'; self.N_g2 = self.N_ghost
# Only for periodic boundary conditions or shearing-box boundary conditions
# do the boundary conditions passed to the DA need to be changed. PETSc
# automatically handles the application of periodic boundary conditions when
# running in parallel. For shearing box boundary conditions, an interpolation
# operation needs to be applied on top of the periodic boundary conditions.
# In all other cases, ghosted boundaries are used.
if( self.boundary_conditions.in_q1_left == 'periodic'
or self.boundary_conditions.in_q1_left == 'shearing-box'
):
petsc_bc_in_q1 = 'periodic'
if( self.boundary_conditions.in_q2_bottom == 'periodic'
or self.boundary_conditions.in_q2_bottom == 'shearing-box'
):
petsc_bc_in_q2 = 'periodic'
if(self.boundary_conditions.in_q1_left == 'none'):
petsc_bc_in_q1 = 'none'; self.N_g1 = 0
if(self.boundary_conditions.in_q2_bottom == 'none'):
petsc_bc_in_q2 = 'none'; self.N_g2 = 0
if(self.boundary_conditions.in_q1_left == 'periodic'):
try:
assert(self.boundary_conditions.in_q1_right == 'periodic')
except:
raise Exception('Periodic boundary conditions need to be applied to \
both the boundaries of a particular axis'
)
if(self.boundary_conditions.in_q1_left == 'shearing-box'):
try:
assert(self.boundary_conditions.in_q1_right == 'shearing-box')
except:
raise Exception('Shearing box boundary conditions need to be applied to \
both the boundaries of a particular axis'
)
if(self.boundary_conditions.in_q2_bottom == 'periodic'):
try:
assert(self.boundary_conditions.in_q2_top == 'periodic')
except:
raise Exception('Periodic boundary conditions need to be applied to \
both the boundaries of a particular axis'
)
if(self.boundary_conditions.in_q2_bottom == 'shearing-box'):
try:
assert(self.boundary_conditions.in_q2_top == 'shearing-box')
except:
raise Exception('Shearing box boundary conditions need to be applied to \
both the boundaries of a particular axis'
)
if(self.boundary_conditions.in_q1_left == 'none'):
try:
assert(self.boundary_conditions.in_q1_right == 'none')
except:
raise Exception('NONE boundary conditions need to be applied to \
both the boundaries of a particular axis'
)
if(self.boundary_conditions.in_q2_bottom == 'none'):
try:
assert(self.boundary_conditions.in_q2_top == 'none')
except:
raise Exception('NONE boundary conditions need to be applied to \
both the boundaries of a particular axis'
)
self._nproc_in_q1 = PETSc.DECIDE
self._nproc_in_q2 = PETSc.DECIDE
# Break up the domain into manually defined portions
self._ownership_ranges = None
if self.physical_system.params.enable_manual_domain_decomposition:
ownership_q1 = [self.N_q1*item for item in self.physical_system.params.q1_partition]
ownership_q2 = [self.N_q2*item for item in self.physical_system.params.q2_partition]
self._ownership_ranges = (ownership_q1, ownership_q2)
# TODO : Implement error handling and give clean messages
# Since shearing boundary conditions require interpolations which are non-local:
if(self.boundary_conditions.in_q2_bottom == 'shearing-box'):
self._nproc_in_q1 = 1
if(self.boundary_conditions.in_q1_left == 'shearing-box'):
self._nproc_in_q2 = 1
# DMDA is a data structure to handle a distributed structure
# grid and its related core algorithms. It stores metadata of
# how the grid is partitioned when run in parallel which is
# utilized by the various methods of the solver.
self._da_f = PETSc.DMDA().create([self.N_q1, self.N_q2],
dof = ( self.N_species
* self.N_p1
* self.N_p2
* self.N_p3
),
stencil_width = N_g,
boundary_type = (petsc_bc_in_q1,
petsc_bc_in_q2
),
proc_sizes = (self._nproc_in_q1,
self._nproc_in_q2
),
ownership_ranges = self._ownership_ranges,
stencil_type = 1,
comm = self._comm
)
lx, ly = self._da_f.getOwnershipRanges()
# This DA is used by the FileIO routine dump_moments():
# Finding the number of definitions for the moments:
attributes = [a for a in dir(self.physical_system.moments) if not a.startswith('_')]
# Removing utility functions:
if('integral_over_v' in attributes):
attributes.remove('integral_over_v')
self._da_dump_moments = PETSc.DMDA().create([self.N_q1, self.N_q2],
dof = self.N_species
* (len(attributes)-2), # don't countintegral_over_p, and params in moments.py
proc_sizes = (self._nproc_in_q1,
self._nproc_in_q2
),
ownership_ranges = self._ownership_ranges,
comm = self._comm
)
# For dumping aux arrays:
self.dump_aux_arrays_initial_call = 1
# Creation of the local and global vectors from the DA:
# This is for the distribution function
self._glob_f = self._da_f.createGlobalVec()
self._local_f = self._da_f.createLocalVec()
# The following vector is used to dump the data to file:
self._glob_moments = self._da_dump_moments.createGlobalVec()
# Getting the arrays for the above vectors:
self._glob_f_array = self._glob_f.getArray()
self._local_f_array = self._local_f.getArray()
self._glob_moments_array = self._glob_moments.getArray()
# Setting names for the objects which will then be
# used as the key identifiers for the HDF5 files:
PETSc.Object.setName(self._glob_f, 'distribution_function')
PETSc.Object.setName(self._glob_moments, 'moments')
# Indexing vars used through out
self.i_q1_start = self.N_g1; self.i_q1_end = -self.N_g1
self.i_q2_start = self.N_g2; self.i_q2_end = -self.N_g2
if (self.N_g1 == 0):
self.i_q1_end = 1
if (self.N_g2 == 0):
self.i_q2_end = 1
# Get start (corner) indices of the local zone wrt global ordering and its size
((_i_q1_start, _i_q2_start), (_N_q1_local, _N_q2_local)) = self._da_f.getCorners()
# Coordinates of the local zone in a global coord system
self.q1_start_local = self.q1_start + _i_q1_start * self.dq1
self.q2_start_local = self.q2_start + _i_q2_start * self.dq2
# TODO : Fix this. Passing into params for use in coords.py
self.physical_system.params.q1_start_local_left = self.q1_start_local
self.physical_system.params.q2_start_local_bottom = self.q2_start_local
print("nonlinear.py: rank = ", self._comm.rank,
"(q1_start_local, q2_start_local) = (",
self.q1_start_local, self.q2_start_local, ")"
)
print("nonlinear.py: rank = ", self._comm.rank,
"(N_q1_local, N_q2_local) = (",
_N_q1_local, _N_q2_local, ")"
)
print("nonlinear.py: rank = ", self._comm.rank,
"ownership_ranges : lx = ", lx, "ly = ", ly
)
self.N_q1_local = _N_q1_local
self.N_q2_local = _N_q2_local
self.N_q1_local_with_Ng = _N_q1_local + 2*self.N_g1
self.N_q2_local_with_Ng = _N_q2_local + 2*self.N_g2
# Obtaining the array values of spatial coordinates:
q_left_bot, q_center_bot, q_left_center, q_center = \
calculate_q(self.q1_start_local,
self.q2_start_local,
self.N_q1_local, self.N_q2_local,
self.N_g1, self.N_g2,
self.dq1, self.dq2
)
self.q1_left_bot = q_left_bot[0]
self.q2_left_bot = q_left_bot[1]
self.q1_center_bot = q_center_bot[0]
self.q2_center_bot = q_center_bot[1]
self.q1_left_center = q_left_center[0]
self.q2_left_center = q_left_center[1]
self.q1_center = q_center[0]
self.q2_center = q_center[1]
self.p1_center, self.p2_center, self.p3_center = \
calculate_p_center(self.p1_start, self.p2_start, self.p3_start,
self.N_p1, self.N_p2, self.N_p3,
self.dp1, self.dp2, self.dp3,
)
self.p1_left, self.p2_bottom, self.p3_back = \
calculate_p_corner(self.p1_start, self.p2_start, self.p3_start,
self.N_p1, self.N_p2, self.N_p3,
self.dp1, self.dp2, self.dp3,
)
# Need to convert the lists dp1, dp2, dp3 to af.Arrays for vector
# computations to work
self.dp1 = af.moddims(af.to_array(np.array(self.dp1)), 1, self.N_species)
self.dp2 = af.moddims(af.to_array(np.array(self.dp2)), 1, self.N_species)
self.dp3 = af.moddims(af.to_array(np.array(self.dp3)), 1, self.N_species)
# Need to do the same for the p1_start/end lists.
self.p1_start = af.moddims(af.to_array(self.p1_start), 1, self.N_species)
self.p2_start = af.moddims(af.to_array(self.p2_start), 1, self.N_species)
self.p3_start = af.moddims(af.to_array(self.p3_start), 1, self.N_species)
self.p1_end = af.moddims(af.to_array(self.p1_end), 1, self.N_species)
self.p2_end = af.moddims(af.to_array(self.p2_end), 1, self.N_species)
self.p3_end = af.moddims(af.to_array(self.p3_end), 1, self.N_species)
self.p2_left = self.p2_center
self.p3_left = self.p3_center
self.p1_bottom = self.p1_center
self.p3_bottom = self.p3_center
self.p1_back = self.p1_center
self.p2_back = self.p2_center
# Initialize according to initial condition provided by user:
self._initialize(physical_system.params)
# Initializing a variable to track time-elapsed:
self.time_elapsed = 0
# Assigning the function objects to methods of the solver:
self._A_q = physical_system.A_q
self._C_q = physical_system.C_q
self._A_p = physical_system.A_p
self._C_p = physical_system.C_p
# Source/Sink term:
self._source = physical_system.source
parser.add_argument("--N", help="Amount of measurements taken. Default: 10",default=10,type=int)
parser.add_argument("--sigma", help="Sigma of gaussian filter. Default: 1.0",default=1.0,type=float)
parser.add_argument("--size", help="Size of squared image. Default: 1024",default=1024,type=int)
parser.add_argument("--raw", help="Produce raw output for plot data.",action="store_true")
parser.add_argument("--device", help="Select GPU device number. Default: 0",default=0,type=int)
args = parser.parse_args()
if not args.raw:
print "--- Parameters ---"
print "\tSize:",args.size
print "\tN:",args.N
print "\tSigma:",args.sigma
print "\tDevice:",args.device
af.set_device(args.device)
# create input image
img = np.random.random((args.size,args.size))
# create arrayfire gaussiankernel
start = time.clock()
afsmk = af_gaussian2D(args.sigma)
end = time.clock()
af_kernel = end-start
# storage for times
af_cpy_hd = np.zeros(args.N)
af_convolve = np.zeros(args.N)
af_cpy_dh = np.zeros(args.N)
vigra_t = np.zeros(args.N)
import arrayfire as af
import afnumpy as afnp
import numpy as np
import sys
from gnufft import tvd_update, add_hessian
import tomopy
import pyqtgraph as pg
import time
import arrayfire as af
af.set_device(2)
nslice = 150
im_size = 2560
#obj = np.ones((nslice,im_size,im_size),dtype=np.float32)
#obj=tomopy.shepp3d((nslice,im_size,im_size),dtype=np.float32)
obj = np.random.rand(nslice, im_size, im_size).astype(np.float32)
x = obj[::2]
y = obj[1::2]
print(x.shape)
vol = x + 1j * y
t = time.time()
vol = afnp.array(vol.astype(np.complex64)) #255*
fcn = afnp.zeros((nslice / 2, im_size, im_size), dtype=np.complex64)
tvd_update(1.2, 1, vol, fcn)
elapsed = time.time() - t
print('Time taken for gradient %f' % (elapsed))
output = np.zeros((nslice, im_size, im_size), dtype=np.float32)
output[::2] = np.array(fcn).real
output[1::2] = np.array(fcn).imag
print(output.max())
print(output.min())
def __init__(self, physical_system, performance_test_flag=False):
"""
Constructor for the nonlinear_solver object. It takes the physical
system object as an argument and uses it in intialization and
evolution of the system in consideration.
Additionally, a performance test flag is also passed which when true
stores time which is consumed by each of the major solver routines.
This proves particularly useful in analyzing performance bottlenecks
and obtaining benchmarks.
Parameters:
-----------
physical_system: The defined physical system object which holds
all the simulation information such as the initial
conditions, and the domain info is passed as an
argument in defining an instance of the
nonlinear_solver. This system is then evolved, and
monitored using the various methods under the
nonlinear_solver class.
"""
self.physical_system = physical_system
# Holding Domain Info:
self.q1_start, self.q1_end = physical_system.q1_start,\
physical_system.q1_end
self.q2_start, self.q2_end = physical_system.q2_start,\
physical_system.q2_end
self.p1_start, self.p1_end = physical_system.p1_start,\
physical_system.p1_end
self.p2_start, self.p2_end = physical_system.p2_start,\
physical_system.p2_end
self.p3_start, self.p3_end = physical_system.p3_start,\
physical_system.p3_end
# Holding Domain Resolution:
self.N_q1, self.dq1 = physical_system.N_q1, physical_system.dq1
self.N_q2, self.dq2 = physical_system.N_q2, physical_system.dq2
self.N_p1, self.dp1 = physical_system.N_p1, physical_system.dp1
self.N_p2, self.dp2 = physical_system.N_p2, physical_system.dp2
self.N_p3, self.dp3 = physical_system.N_p3, physical_system.dp3
# Getting number of ghost zones, and the boundary
# conditions that are utilized:
N_g = self.N_ghost = physical_system.N_ghost
self.boundary_conditions = physical_system.boundary_conditions
# Declaring the communicator:
self._comm = PETSc.COMM_WORLD.tompi4py()
if (self.physical_system.params.num_devices > 1):
af.set_device(self._comm.rank %
self.physical_system.params.num_devices)
PETSc.Sys.Print('\nBackend Details for Nonlinear Solver:')
# Printing the backend details for each rank/device/node:
PETSc.Sys.syncPrint(
indent('Rank ' + str(self._comm.rank) + ' of ' +
str(self._comm.size - 1)))
PETSc.Sys.syncPrint(indent('On Node: ' + socket.gethostname()))
PETSc.Sys.syncPrint(indent('Device Details:'))
PETSc.Sys.syncPrint(indent(af.info_str(), 2))
PETSc.Sys.syncPrint(
indent('Device Bandwidth = ' + str(bandwidth_test(100)) +
' GB / sec'))
PETSc.Sys.syncPrint()
PETSc.Sys.syncFlush()
self.performance_test_flag = performance_test_flag
if (performance_test_flag == True):
self.time_ts = 0
self.time_interp2 = 0
self.time_sourcets = 0
self.time_fvm_solver = 0
self.time_reconstruct = 0
self.time_riemann = 0
self.time_fieldstep = 0
self.time_fieldsolver = 0
self.time_interp3 = 0
self.time_apply_bcs_f = 0
self.time_apply_bcs_fields = 0
self.time_communicate_f = 0
self.time_communicate_fields = 0
petsc_bc_in_q1 = 'ghosted'
petsc_bc_in_q2 = 'ghosted'
# Only for periodic boundary conditions do the boundary
# conditions passed to the DA need to be changed. PETSc
# automatically handles the application of periodic
# boundary conditions when running in parallel. In all other
# cases, ghosted boundaries are used.
if (self.boundary_conditions.in_q1_left == 'periodic'):
petsc_bc_in_q1 = 'periodic'
if (self.boundary_conditions.in_q2_bottom == 'periodic'):
petsc_bc_in_q2 = 'periodic'
# DMDA is a data structure to handle a distributed structure
# grid and its related core algorithms. It stores metadata of
# how the grid is partitioned when run in parallel which is
# utilized by the various methods of the solver.
self._da_f = PETSc.DMDA().create(
[self.N_q1, self.N_q2],
dof=(self.N_p1 * self.N_p2 * self.N_p3),
stencil_width=self.N_ghost,
boundary_type=(petsc_bc_in_q1, petsc_bc_in_q2),
proc_sizes=(PETSc.DECIDE, PETSc.DECIDE),
stencil_type=1,
comm=self._comm)
# This DA object is used in the communication routines for the
# EM field quantities. A DOF of 6 is taken so that the communications,
# and application of B.C's may be carried out in a single call among
# all the field quantities(E1, E2, E3, B1, B2, B3)
self._da_fields = PETSc.DMDA().create([self.N_q1, self.N_q2],
dof=6,
stencil_width=self.N_ghost,
boundary_type=(petsc_bc_in_q1,
petsc_bc_in_q2),
proc_sizes=(PETSc.DECIDE,
PETSc.DECIDE),
stencil_type=1,
comm=self._comm)
# Additionally, a DMDA object also needs to be created for
# the KSP/SNES solver with a DOF of 1. This is used to solve for
# the electrostatic case:
self._da_ksp = PETSc.DMDA().create([self.N_q1, self.N_q2],
stencil_width=self.N_ghost,
boundary_type=(petsc_bc_in_q1,
petsc_bc_in_q2),
proc_sizes=(PETSc.DECIDE,
PETSc.DECIDE),
stencil_type=1,
comm=self._comm)
# This DA is used by the FileIO routine dump_moments():
self._da_dump_moments = PETSc.DMDA().create(
[self.N_q1, self.N_q2],
dof=len(self.physical_system.moment_exponents),
proc_sizes=(PETSc.DECIDE, PETSc.DECIDE),
comm=self._comm)
# Creation of the local and global vectors from the DA:
# This is for the distribution function
self._glob_f = self._da_f.createGlobalVec()
self._local_f = self._da_f.createLocalVec()
# The following global and local vectors are used in
# the communication routines for EM fields
self._glob_fields = self._da_fields.createGlobalVec()
self._local_fields = self._da_fields.createLocalVec()
# The following vector is used to dump the data to file:
self._glob_moments = self._da_dump_moments.createGlobalVec()
# Getting the arrays for the above vectors:
self._glob_f_array = self._glob_f.getArray()
self._local_f_array = self._local_f.getArray()
self._glob_fields_array = self._glob_fields.getArray()
self._local_fields_array = self._local_fields.getArray()
self._glob_moments_array = self._glob_moments.getArray()
# Setting names for the objects which will then be
# used as the key identifiers for the HDF5 files:
PETSc.Object.setName(self._glob_f, 'distribution_function')
PETSc.Object.setName(self._glob_moments, 'moments')
# Obtaining the array values of the cannonical variables:
self.q1_center, self.q2_center = self._calculate_q_center()
self.p1, self.p2, self.p3 = self._calculate_p_center()
# Initialize according to initial condition provided by user:
self._initialize(physical_system.params)
# Obtaining start coordinates for the local zone
# Additionally, we also obtain the size of the local zone
((i_q1_start, i_q2_start), (N_q1_local,
N_q2_local)) = self._da_f.getCorners()
(i_q1_end, i_q2_end) = (i_q1_start + N_q1_local - 1,
i_q2_start + N_q2_local - 1)
# Applying dirichlet boundary conditions:
if (self.physical_system.boundary_conditions.in_q1_left == 'dirichlet'
):
# If local zone includes the left physical boundary:
if (i_q1_start == 0):
self.f[:, :N_g] = self.boundary_conditions.\
f_left(self.f, self.q1_center, self.q2_center,
self.p1, self.p2, self.p3,
self.physical_system.params
)[:, :N_g]
if (self.physical_system.boundary_conditions.in_q1_right == 'dirichlet'
):
# If local zone includes the right physical boundary:
if (i_q1_end == self.N_q1 - 1):
self.f[:, -N_g:] = self.boundary_conditions.\
f_right(self.f, self.q1_center, self.q2_center,
self.p1, self.p2, self.p3,
self.physical_system.params
)[:, -N_g:]
if (self.physical_system.boundary_conditions.in_q2_bottom ==
'dirichlet'):
# If local zone includes the bottom physical boundary:
if (i_q2_start == 0):
self.f[:, :, :N_g] = self.boundary_conditions.\
f_bot(self.f, self.q1_center, self.q2_center,
self.p1, self.p2, self.p3,
self.physical_system.params
)[:, :, :N_g]
if (self.physical_system.boundary_conditions.in_q2_top == 'dirichlet'):
# If local zone includes the top physical boundary:
if (i_q2_end == self.N_q2 - 1):
self.f[:, :, -N_g:] = self.boundary_conditions.\
f_top(self.f, self.q1_center, self.q2_center,
self.p1, self.p2, self.p3,
self.physical_system.params
)[:, :, -N_g:]
# Assigning the value to the PETSc Vecs(for dump at t = 0):
(af.flat(self.f)).to_ndarray(self._local_f_array)
(af.flat(self.f[:, N_g:-N_g, N_g:-N_g])).to_ndarray(self._glob_f_array)
# Assigning the advection terms along q1 and q2
self._A_q1 = physical_system.A_q(self.q1_center, self.q2_center,
self.p1, self.p2, self.p3,
physical_system.params)[0]
self._A_q2 = physical_system.A_q(self.q1_center, self.q2_center,
self.p1, self.p2, self.p3,
physical_system.params)[1]
# Assigning the conservative advection terms along q1 and q2
self._C_q1 = physical_system.C_q(self.q1_center, self.q2_center,
self.p1, self.p2, self.p3,
physical_system.params)[0]
self._C_q2 = physical_system.C_q(self.q1_center, self.q2_center,
self.p1, self.p2, self.p3,
physical_system.params)[1]
# Assigning the function objects to methods of the solver:
self._A_p = physical_system.A_p
# Source/Sink term:
self._source = physical_system.source
# Initializing a variable to track time-elapsed:
# This becomes necessary when applying shearing wall
# boundary conditions(WIP):
self.time_elapsed = 0
#! /usr/bin/env python3 # -*- coding: utf-8 -*- import numpy as np import arrayfire as af backend = 'opencl' device = 0 af.set_backend(backend) af.set_device(device) from dg_maxwell import lagrange from dg_maxwell import isoparam from dg_maxwell import utils from dg_maxwell import msh_parser from dg_maxwell import wave_equation from dg_maxwell import wave_equation_2d # The domain of the function. x_nodes = af.np_to_af_array(np.array([-1., 1.])) # The number of LGL points into which an element is split. N_LGL = 6 # Number of elements the domain is to be divided into. N_Elements = 9 # The scheme to be used for integration. Values are either # 'gauss_quadrature' or 'lobatto_quadrature'
def __init__(self, physical_system, performance_test_flag=False):
"""
Constructor for the nonlinear_solver object. It takes the physical
system object as an argument and uses it in intialization and
evolution of the system in consideration.
Additionally, a performance test flag is also passed which when true,
stores time which is consumed by each of the major solver routines.
This proves particularly useful in analyzing performance bottlenecks
and obtaining benchmarks.
Parameters:
-----------
physical_system: The defined physical system object which holds
all the simulation information such as the initial
conditions, and the domain info is passed as an
argument in defining an instance of the
nonlinear_solver. This system is then evolved, and
monitored using the various methods under the
nonlinear_solver class.
"""
self.physical_system = physical_system
# Holding Domain Info:
self.q1_start, self.q1_end = physical_system.q1_start,\
physical_system.q1_end
self.q2_start, self.q2_end = physical_system.q2_start,\
physical_system.q2_end
self.p1_start, self.p1_end = physical_system.p1_start,\
physical_system.p1_end
self.p2_start, self.p2_end = physical_system.p2_start,\
physical_system.p2_end
self.p3_start, self.p3_end = physical_system.p3_start,\
physical_system.p3_end
# Holding Domain Resolution:
self.N_q1, self.dq1 = physical_system.N_q1, physical_system.dq1
self.N_q2, self.dq2 = physical_system.N_q2, physical_system.dq2
self.N_p1, self.dp1 = physical_system.N_p1, physical_system.dp1
self.N_p2, self.dp2 = physical_system.N_p2, physical_system.dp2
self.N_p3, self.dp3 = physical_system.N_p3, physical_system.dp3
# Getting number of ghost zones, and the boundary
# conditions that are utilized:
N_g_q = self.N_ghost_q = physical_system.N_ghost_q
N_g_p = self.N_ghost_p = physical_system.N_ghost_p
self.boundary_conditions = physical_system.boundary_conditions
# Declaring the communicator:
self._comm = PETSc.COMM_WORLD.tompi4py()
if (self.physical_system.params.num_devices > 1):
af.set_device(self._comm.rank %
self.physical_system.params.num_devices)
# Getting number of species:
self.N_species = len(physical_system.params.mass)
# Having the mass and charge along axis 1:
self.physical_system.params.mass = \
af.cast(af.moddims(af.to_array(physical_system.params.mass),
1, self.N_species
),
af.Dtype.f64
)
self.physical_system.params.charge = \
af.cast(af.moddims(af.to_array(physical_system.params.charge),
1, self.N_species
),
af.Dtype.f64
)
PETSc.Sys.Print('\nBackend Details for Nonlinear Solver:')
# Printing the backend details for each rank/device/node:
PETSc.Sys.syncPrint(
indent('Rank ' + str(self._comm.rank) + ' of ' +
str(self._comm.size - 1)))
PETSc.Sys.syncPrint(indent('On Node: ' + socket.gethostname()))
PETSc.Sys.syncPrint(indent('Device Details:'))
PETSc.Sys.syncPrint(indent(af.info_str(), 2))
PETSc.Sys.syncPrint(
indent('Device Bandwidth = ' + str(bandwidth_test(100)) +
' GB / sec'))
PETSc.Sys.syncPrint()
PETSc.Sys.syncFlush()
self.performance_test_flag = performance_test_flag
# Initializing variables which are used to time the components of the solver:
if (performance_test_flag == True):
self.time_ts = 0
self.time_interp2 = 0
self.time_sourcets = 0
self.time_fvm_solver = 0
self.time_reconstruct = 0
self.time_riemann = 0
self.time_fieldstep = 0
self.time_interp3 = 0
self.time_apply_bcs_f = 0
self.time_communicate_f = 0
petsc_bc_in_q1 = 'ghosted'
petsc_bc_in_q2 = 'ghosted'
# Only for periodic boundary conditions or shearing-box boundary conditions
# do the boundary conditions passed to the DA need to be changed. PETSc
# automatically handles the application of periodic boundary conditions when
# running in parallel. For shearing box boundary conditions, an interpolation
# operation needs to be applied on top of the periodic boundary conditions.
# In all other cases, ghosted boundaries are used.
if (self.boundary_conditions.in_q1_left == 'periodic'
or self.boundary_conditions.in_q1_left == 'shearing-box'):
petsc_bc_in_q1 = 'periodic'
if (self.boundary_conditions.in_q2_bottom == 'periodic'
or self.boundary_conditions.in_q2_bottom == 'shearing-box'):
petsc_bc_in_q2 = 'periodic'
if (self.boundary_conditions.in_q1_left == 'periodic'):
try:
assert (self.boundary_conditions.in_q1_right == 'periodic')
except:
raise Exception(
'Periodic boundary conditions need to be applied to \
both the boundaries of a particular axis')
if (self.boundary_conditions.in_q1_left == 'shearing-box'):
try:
assert (self.boundary_conditions.in_q1_right == 'shearing-box')
except:
raise Exception(
'Shearing box boundary conditions need to be applied to \
both the boundaries of a particular axis')
if (self.boundary_conditions.in_q2_bottom == 'periodic'):
try:
assert (self.boundary_conditions.in_q2_top == 'periodic')
except:
raise Exception(
'Periodic boundary conditions need to be applied to \
both the boundaries of a particular axis')
if (self.boundary_conditions.in_q2_bottom == 'shearing-box'):
try:
assert (self.boundary_conditions.in_q2_top == 'shearing-box')
except:
raise Exception(
'Shearing box boundary conditions need to be applied to \
both the boundaries of a particular axis')
nproc_in_q1 = PETSc.DECIDE
nproc_in_q2 = PETSc.DECIDE
# Since shearing boundary conditions require interpolations which are non-local:
if (self.boundary_conditions.in_q2_bottom == 'shearing-box'):
nproc_in_q1 = 1
if (self.boundary_conditions.in_q1_left == 'shearing-box'):
nproc_in_q2 = 1
# DMDA is a data structure to handle a distributed structure
# grid and its related core algorithms. It stores metadata of
# how the grid is partitioned when run in parallel which is
# utilized by the various methods of the solver.
self._da_f = PETSc.DMDA().create(
[self.N_q1, self.N_q2],
dof=(self.N_species * (self.N_p1 + 2 * N_g_p) *
(self.N_p2 + 2 * N_g_p) * (self.N_p3 + 2 * N_g_p)),
stencil_width=N_g_q,
boundary_type=(petsc_bc_in_q1, petsc_bc_in_q2),
proc_sizes=(nproc_in_q1, nproc_in_q2),
stencil_type=1,
comm=self._comm)
# This DA is used by the FileIO routine dump_distribution_function():
self._da_dump_f = PETSc.DMDA().create(
[self.N_q1, self.N_q2],
dof=(self.N_species * self.N_p1 * self.N_p2 * self.N_p3),
stencil_width=N_g_q,
boundary_type=(petsc_bc_in_q1, petsc_bc_in_q2),
proc_sizes=(nproc_in_q1, nproc_in_q2),
stencil_type=1,
comm=self._comm)
# This DA is used by the FileIO routine dump_moments():
# Finding the number of definitions for the moments:
attributes = [
a for a in dir(self.physical_system.moments)
if not a.startswith('_')
]
# Removing utility functions:
if ('integral_over_v' in attributes):
attributes.remove('integral_over_v')
self._da_dump_moments = PETSc.DMDA().create(
[self.N_q1, self.N_q2],
dof=self.N_species * len(attributes),
proc_sizes=(nproc_in_q1, nproc_in_q2),
comm=self._comm)
# Creation of the local and global vectors from the DA:
# This is for the distribution function
self._glob_f = self._da_f.createGlobalVec()
self._local_f = self._da_f.createLocalVec()
# The following vector is used to dump the data to file:
self._glob_dump_f = self._da_dump_f.createGlobalVec()
self._glob_moments = self._da_dump_moments.createGlobalVec()
# Getting the arrays for the above vectors:
self._glob_f_array = self._glob_f.getArray()
self._local_f_array = self._local_f.getArray()
self._glob_moments_array = self._glob_moments.getArray()
self._glob_dump_f_array = self._glob_dump_f.getArray()
# Setting names for the objects which will then be
# used as the key identifiers for the HDF5 files:
PETSc.Object.setName(self._glob_dump_f, 'distribution_function')
PETSc.Object.setName(self._glob_moments, 'moments')
# Obtaining the array values of the cannonical variables:
self.q1_center, self.q2_center = self._calculate_q_center()
self.p1_center, self.p2_center, self.p3_center = self._calculate_p_center(
)
# Initialize according to initial condition provided by user:
self._initialize(physical_system.params)
# Obtaining start coordinates for the local zone
# Additionally, we also obtain the size of the local zone
((i_q1_start, i_q2_start), (N_q1_local,
N_q2_local)) = self._da_f.getCorners()
(i_q1_end, i_q2_end) = (i_q1_start + N_q1_local - 1,
i_q2_start + N_q2_local - 1)
# Applying dirichlet boundary conditions:
if (self.physical_system.boundary_conditions.in_q1_left == 'dirichlet'
):
# If local zone includes the left physical boundary:
if (i_q1_start == 0):
self.f[:, :N_g_q] = self.boundary_conditions.\
f_left(self.f, self.q1_center, self.q2_center,
self.p1_center, self.p2_center, self.p3_center,
self.physical_system.params
)[:, :N_g_q]
if (self.physical_system.boundary_conditions.in_q1_right == 'dirichlet'
):
# If local zone includes the right physical boundary:
if (i_q1_end == self.N_q1 - 1):
self.f[:, -N_g_q:] = self.boundary_conditions.\
f_right(self.f, self.q1_center, self.q2_center,
self.p1_center, self.p2_center, self.p3_center,
self.physical_system.params
)[:, -N_g_q:]
if (self.physical_system.boundary_conditions.in_q2_bottom ==
'dirichlet'):
# If local zone includes the bottom physical boundary:
if (i_q2_start == 0):
self.f[:, :, :N_g_q] = self.boundary_conditions.\
f_bot(self.f, self.q1_center, self.q2_center,
self.p1_center, self.p2_center, self.p3_center,
self.physical_system.params
)[:, :, :N_g_q]
if (self.physical_system.boundary_conditions.in_q2_top == 'dirichlet'):
# If local zone includes the top physical boundary:
if (i_q2_end == self.N_q2 - 1):
self.f[:, :, -N_g_q:] = self.boundary_conditions.\
f_top(self.f, self.q1_center, self.q2_center,
self.p1_center, self.p2_center, self.p3_center,
self.physical_system.params
)[:, :, -N_g_q:]
# Assigning the value to the PETSc Vecs(for dump at t = 0):
(af.flat(self.f)).to_ndarray(self._local_f_array)
(af.flat(self.f[:, :, N_g_q:-N_g_q,
N_g_q:-N_g_q])).to_ndarray(self._glob_f_array)
# Assigning the function objects to methods of the solver:
self._A_q = physical_system.A_q
self._C_q = physical_system.C_q
self._A_p = physical_system.A_p
self._C_p = physical_system.C_p
# Source/Sink term:
self._source = physical_system.source
# Initializing a variable to track time-elapsed:
self.time_elapsed = 0
def gpuMBIR(tomo,angles,center,input_params):
"""
MBIR reconstruction using GPU based gridding operators
Inputs: tomo : 3D numpy sinogram array with dimensions same as tomopy
angles : Array of angles in radians
center : Floating point center of rotation
input_params : A dictionary with the keys
'gpu_device' : Device id of the gpu (For a 4 GPU cluster ; 0-3)
'oversamp_factor': A factor by which to pad the image/data for FFT
'num_iter' : Max number of MBIR iterations
'smoothness' : Regularization constant
'p': MRF shape param
"""
print('Starting GPU MBIR recon')
#allocate space for final answer
af.set_device(input_params['gpu_device']) #Set the device number for gpu based code
#Change tomopy format
new_tomo=np.transpose(tomo,(1,2,0)) #slice, columns, angles
im_size = new_tomo.shape[1]
num_slice = new_tomo.shape[0]
num_angles=new_tomo.shape[2]
pad_size=np.int16(im_size*input_params['oversamp_factor'])
# nufft_scaling = (np.pi/pad_size)**2
num_iter = input_params['num_iter']
mrf_sigma = input_params['smoothness']
mrf_p = input_params['p']
print('MRF params p=%f sigma=%f' %(mrf_p,mrf_sigma))
#Initialize structures for NUFFT
sino={}
geom={}
sino['Ns'] = pad_size#Sinogram size after padding
sino['Ns_orig'] = im_size #size of original sinogram
sino['center'] = center + (sino['Ns']/2 - sino['Ns_orig']/2) #for padded sinogram
sino['angles'] = angles
#Initialize NUFFT parameters
print('Initialize NUFFT params')
nufft_params = init_nufft_params(sino,geom)
temp_y = afnp.zeros((sino['Ns'],num_angles),dtype=afnp.complex64)
temp_x = afnp.zeros((sino['Ns'],sino['Ns']),dtype=afnp.complex64)
x_recon = afnp.zeros((num_slice/2,sino['Ns_orig'],sino['Ns_orig']),dtype=afnp.complex64)
pad_idx = slice(sino['Ns']/2-sino['Ns_orig']/2,sino['Ns']/2+sino['Ns_orig']/2)
#allocate output array
rec_mbir_final=np.zeros((num_slice,sino['Ns_orig'],sino['Ns_orig']),dtype=np.float32)
#Move all data to GPU
print('Moving data to GPU')
slice_1=slice(0,num_slice,2)
slice_2=slice(1,num_slice,2)
gdata=afnp.array(new_tomo[slice_1]+1j*new_tomo[slice_2],dtype=afnp.complex64)
gradient = afnp.zeros((num_slice/2,sino['Ns_orig'],sino['Ns_orig']), dtype=afnp.complex64)#temp array to store the derivative of cost func
z_recon = afnp.zeros((num_slice/2,sino['Ns_orig'],sino['Ns_orig']),dtype=afnp.complex64)#Nesterov method variables
t_nes = 1
#Compute Lipschitz of gradient
print('Computing Lipschitz of gradient')
x_ones= afnp.ones((1,sino['Ns_orig'],sino['Ns_orig']),dtype=afnp.complex64)
temp_x[pad_idx,pad_idx]=x_ones[0]
temp_proj=forward_project(temp_x,nufft_params)
temp_backproj=(back_project(temp_proj,nufft_params))[pad_idx,pad_idx]
print('Adding Hessian of regularizer')
temp_backproj2=afnp.zeros((1,sino['Ns_orig'],sino['Ns_orig']),dtype=afnp.complex64)
temp_backproj2[0]=temp_backproj
add_hessian(mrf_sigma,x_ones, temp_backproj2)
L = np.max([temp_backproj2.real.max(),temp_backproj2.imag.max()])
print('Lipschitz constant = %f' %(L))
del x_ones,temp_proj,temp_backproj,temp_backproj2
#loop over all slices
for iter_num in range(num_iter):
print('Iteration %d of %d'%(iter_num,num_iter))
#Derivative of the data fitting term
for i in range(num_slice/2):
temp_x[pad_idx,pad_idx]=x_recon[i]
Ax = forward_project(temp_x,nufft_params)
temp_y[pad_idx]=gdata[i]
gradient[i] =(back_project((Ax-temp_y),nufft_params))[pad_idx,pad_idx] #nufft_scaling
#Derivative of regularization term
tvd_update(mrf_p,mrf_sigma,x_recon, gradient)
#x_recon-=gradient/L
x_recon,z_recon,t_nes=nesterovOGM2update(x_recon,z_recon,t_nes,gradient,L)
#Move to CPU
#Rescale result to match tomopy
rec_mbir=np.array(x_recon,dtype=np.complex64)
rec_mbir_final[slice_1]=np.array(rec_mbir.real,dtype=np.float32)
rec_mbir_final[slice_2]=np.array(rec_mbir.imag,dtype=np.float32)
return rec_mbir_final
def gpuSIRT(tomo, angles, center, input_params):
print('Starting GPU SIRT recon')
#allocate space for final answer
af.set_device(
input_params['gpu_device']) #Set the device number for gpu based code
#Change tomopy format
new_tomo = np.transpose(tomo, (1, 2, 0)) #slice, columns, angles
im_size = new_tomo.shape[1]
num_slice = new_tomo.shape[0]
num_angles = new_tomo.shape[2]
pad_size = np.int16(im_size * input_params['oversamp_factor'])
nufft_scaling = (np.pi / pad_size)**2
num_iter = input_params['num_iter']
#Initialize structures for NUFFT
sino = {}
geom = {}
sino['Ns'] = pad_size #Sinogram size after padding
sino['Ns_orig'] = im_size #size of original sinogram
sino['center'] = center + (sino['Ns'] / 2 - sino['Ns_orig'] / 2
) #for padded sinogram
sino['angles'] = angles
#Initialize NUFFT parameters
nufft_params = init_nufft_params(sino, geom)
temp_y = afnp.zeros((sino['Ns'], num_angles), dtype=afnp.complex64)
temp_x = afnp.zeros((sino['Ns'], sino['Ns']), dtype=afnp.complex64)
x_recon = afnp.zeros((num_slice / 2, sino['Ns_orig'], sino['Ns_orig']),
dtype=afnp.complex64)
pad_idx = slice(sino['Ns'] / 2 - sino['Ns_orig'] / 2,
sino['Ns'] / 2 + sino['Ns_orig'] / 2)
#allocate output array
rec_sirt_final = np.zeros((num_slice, sino['Ns_orig'], sino['Ns_orig']),
dtype=np.float32)
#Pre-compute diagonal scaling matrices ; one the same size as the image and the other the same as data
#initialize an image of all ones
x_ones = afnp.ones((sino['Ns_orig'], sino['Ns_orig']),
dtype=afnp.complex64)
temp_x[pad_idx, pad_idx] = x_ones
temp_proj = forward_project(temp_x,
nufft_params) * (sino['Ns'] * afnp.pi / 2)
R = 1 / afnp.abs(temp_proj)
R[afnp.isnan(R)] = 0
R[afnp.isinf(R)] = 0
R = afnp.array(R, dtype=afnp.complex64)
#Initialize a sinogram of all ones
y_ones = afnp.ones((sino['Ns_orig'], num_angles), dtype=afnp.complex64)
temp_y[pad_idx] = y_ones
temp_backproj = back_project(temp_y, nufft_params) * nufft_scaling / 2
C = 1 / (afnp.abs(temp_backproj))
C[afnp.isnan(C)] = 0
C[afnp.isinf(C)] = 0
C = afnp.array(C, dtype=afnp.complex64)
#Move all data to GPU
slice_1 = slice(0, num_slice, 2)
slice_2 = slice(1, num_slice, 2)
gdata = afnp.array(new_tomo[slice_1] + 1j * new_tomo[slice_2],
dtype=afnp.complex64)
#loop over all slices
for i in range(num_slice / 2):
for iter_num in range(num_iter):
#filtered back-projection
temp_x[pad_idx, pad_idx] = x_recon[i]
Ax = (np.pi / 2) * sino['Ns'] * forward_project(
temp_x, nufft_params)
temp_y[pad_idx] = gdata[i]
x_recon[i] = x_recon[i] + (
C * back_project(R * (temp_y - Ax), nufft_params) *
nufft_scaling / 2)[pad_idx, pad_idx]
#Move to CPU
#Rescale result to match tomopy
rec_sirt = np.array(x_recon, dtype=np.complex64)
rec_sirt_final[slice_1] = np.array(rec_sirt.real, dtype=np.float32)
rec_sirt_final[slice_2] = np.array(rec_sirt.imag, dtype=np.float32)
return rec_sirt_final
out.arr = ctypes.c_void_p(af_array_ptr)
print("Converting from ", hex(af_array_ptr))
# print("New array has device pointer ",hex(get_gpu_pointer(out)))
return out
def get_use_count(arr):
uses = ctypes.c_int(0)
af.safe_call(af.backend.get().af_get_data_ref_count(
af.c_pointer(uses), arr.arr))
return uses
# use gpu backend
af.set_backend('cuda')
af.set_device(0) # select the gpu to use
af.info()
van = np.array([1, 2, 3, 5])
van = np.vander(van)
two = np.ones((4, 4)) * 2
print("Define stuff", flush=True)
afvan = af.interop.from_ndarray(van)
afvan = afvan.as_type(af.Dtype.f32)
afthr = af.interop.from_ndarray(two)
afthr = afthr.as_type(af.Dtype.f32)
af.device.print_mem_info("before loops")
from dg_maxwell import params
from dg_maxwell import wave_equation
import arrayfire as af
af.set_backend('cpu')
af.set_device(0)
def L1_norm(u):
'''
A function to calculate the L1 norm of error using
the polynomial obtained using Lagrange interpolation
Parameters
----------
u : arrayfire.Array [N_LGL N_Elements 1 1]
Difference between analytical and numerical u at the mapped LGL points.
Returns
-------
L1_norm : float64
The L1 norm of error.
'''
interpolated_coeffs = af.reorder(lagrange.lagrange_interpolation_u(\
u), 2, 1, 0)
L1_norm = af.sum(lagrange.integrate(interpolated_coeffs))
return L1_norm
# The complete license agreement can be obtained at:
# http://arrayfire.com/licenses/BSD-3-Clause
########################################################
import arrayfire as af
import sys
import os
if __name__ == "__main__":
if (len(sys.argv) == 1):
raise RuntimeError("Expected to the image as the first argument")
if not os.path.isfile(sys.argv[1]):
raise RuntimeError("File %s not found" % sys.argv[1])
if (len(sys.argv) > 2):
af.set_device(int(sys.argv[2]))
af.info()
hist_win = af.Window(512, 512, "3D Plot example using ArrayFire")
img_win = af.Window(480, 640, "Input Image")
img = (af.load_image(sys.argv[1])).(af.Dtype.u8)
hist = af.histogram(img, 256, 0, 255)
while (not hist_win.close()) and (not img_win.close()):
hist_win.hist(hist, 0, 255)
img_win.image(img)
return af.mean(payoff) * math.exp(-r * t)
def monte_carlo_simulate(N, use_barrier, num_iter = 10):
steps = 180
stock_price = 100.0
maturity = 0.5
volatility = 0.3
rate = 0.01
strike = 100
barrier = 115.0
start = time()
for i in range(num_iter):
monte_carlo_options(N, stock_price, maturity, volatility, rate, strike, steps,
use_barrier, barrier)
return (time() - start) / num_iter
if __name__ == "__main__":
if (len(sys.argv) > 1):
af.set_device(int(sys.argv[1]))
af.info()
monte_carlo_simulate(1000, use_barrier = False)
monte_carlo_simulate(1000, use_barrier = True )
af.sync()
for n in range(10000, 100001, 10000):
print("Time for %7d paths - vanilla method: %4.3f ms, barrier method: % 4.3f ms\n" %
(n, 1000 * monte_carlo_simulate(n, False, 100), 1000 * monte_carlo_simulate(n, True, 100)))
#######################################################
# Copyright (c) 2015, ArrayFire
# All rights reserved.
#
# This file is distributed under 3-clause BSD license.
# The complete license agreement can be obtained at:
# http://arrayfire.com/licenses/BSD-3-Clause
########################################################
import arrayfire as af
af.info()
print(af.device_info())
print(af.get_device_count())
print(af.is_dbl_supported())
af.sync()
print('starting the loop')
for k in range(af.get_device_count()):
af.set_device(k)
dev = af.get_device()
assert(k == dev)
print(af.is_dbl_supported(k))
a = af.randu(100, 100)
af.sync(dev)
mem_info = af.device_mem_info()
assert(mem_info['alloc']['buffers'] == 1)
assert(mem_info[ 'lock']['buffers'] == 1)
#! /usr/bin/env python3
# -*- coding: utf-8 -*-
import numpy as np
from scipy import special as sp
import arrayfire as af
from dg_maxwell import utils
from dg_maxwell import params
af.set_backend(params.backend)
af.set_device(params.device)
def LGL_points(N):
'''
Calculates : math: `N` Legendre-Gauss-Lobatto (LGL) points.
LGL points are the roots of the polynomial
:math: `(1 - \\xi ** 2) P_{n - 1}'(\\xi) = 0`
Where :math: `P_{n}(\\xi)` are the Legendre polynomials.
This function finds the roots of the above polynomial.
Parameters
----------
N : int
Number of LGL nodes required
Returns
#######################################################
# Copyright (c) 2015, ArrayFire
# All rights reserved.
#
# This file is distributed under 3-clause BSD license.
# The complete license agreement can be obtained at:
# http://arrayfire.com/licenses/BSD-3-Clause
########################################################
import arrayfire as af
af.info()
print(af.device_info())
print(af.get_device_count())
print(af.is_dbl_supported())
af.sync()
print('starting the loop')
for k in range(af.get_device_count()):
af.set_device(k)
dev = af.get_device()
assert (k == dev)
print(af.is_dbl_supported(k))
a = af.randu(100, 100)
af.sync(dev)
mem_info = af.device_mem_info()
assert (mem_info['alloc']['buffers'] == 1)
assert (mem_info['lock']['buffers'] == 1)