Configure efficient pipelines#
Here we focus on several important aspects which can be helpful while configuring a process list. In order to construct more efficient pipelines one needs to be familiar with Method pattern and method order, Re-slicing, and Sections.
Method pattern and method order#
An HTTomo pipeline consists of multiple methods ordered sequentially and is executed in the given serial order (meaning that there is no branching in HTTomo pipelines). Behind the scenes HTTomo will take care of providing the input data for each method, and passing the output data of each method to the next method.
Different methods require data to be provided in different orientations (ie, the
direction of slicing an array). In order to satisfy those requirements, the notion
of a method having a pattern was introduced in HTTomo, i.e., every method has a
pattern associated with it. So far HTTomo supports three types of patterns:
projection
, sinogram
, and all
.
Note
Transitioning between methods that change the pattern from
projection
to sinogram
or vice versa will trigger a costly
Re-slicing operation. Methods with pattern all
inherit the
pattern of the previous method.
In order to minimise the amount of reslice operations it is best to group methods together based on the pattern. For example, putting methods that work with projections in one group, and methods that work with sinograms in another group. It may not always be possible to group the methods in such way, especially with longer pipelines. However, it’s useful to keep this in mind if one seeks the most computationally efficient pipeline.
The pattern of any supported method can be found in Library files.
Note
Currently, HTTomo loaders use the projection
pattern by default,
therefore it’s best for efficiency purposes that the first method after the
loader has the projection
pattern. It is also recommended to place
Centre of Rotation (CoR) methods right after the loader.
Library files#
Here is the list of library files for backends where patterns and other fixed arguments for methods are specified. When HTTomo operates with a certain method it always refers to its library file in order get the specific requirements for that method.
TomoPy’s library file
sim:
project:
add_drift:
pattern: all
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
add_focal_spot_blur:
pattern: all
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
add_gaussian:
pattern: all
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
add_poisson:
pattern: all
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
add_rings:
pattern: all
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
add_salt_pepper:
pattern: all
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
add_zingers:
pattern: all
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
project:
pattern: all
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
project2:
pattern: all
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
project3:
pattern: all
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
misc:
corr:
adjust_range:
pattern: all
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
circ_mask:
pattern: all
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
gaussian_filter:
pattern: all
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
median_filter:
pattern: all
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
median_filter3d:
pattern: all
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: True
median_filter_nonfinite:
pattern: all
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
remove_nan:
pattern: all
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
remove_neg:
pattern: all
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
remove_outlier:
pattern: all
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
remove_outlier1d:
pattern: all
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
remove_outlier3d:
pattern: all
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: True
remove_ring:
pattern: all
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
sobel_filter:
pattern: all
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
morph:
downsample:
pattern: all
output_dims_change: True
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
pad:
pattern: all
output_dims_change: True
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
sino_360_to_180:
pattern: sinogram
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
trim_sinogram:
pattern: sinogram
output_dims_change: True
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
upsample:
pattern: all
output_dims_change: True
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
prep:
alignment:
add_jitter:
pattern: projection
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
add_noise:
pattern: all
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
align_joint:
pattern: sinogram
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
align_seq:
pattern: sinogram
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
blur_edges:
pattern: projection
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
distortion_correction_proj:
pattern: projection
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
distortion_correction_sino:
pattern: sinogram
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
scale:
pattern: projection
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
shift_images:
pattern: projection
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
normalize:
minus_log:
pattern: projection
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
normalize:
pattern: projection
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
normalize_roi:
pattern: projection
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
normalize_bg:
pattern: projection
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
normalize_nf:
pattern: projection
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
phase:
retrieve_phase:
pattern: projection
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
stripe:
remove_all_stripe:
pattern: sinogram
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
remove_stripe_fw:
pattern: sinogram
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
remove_stripe_ti:
pattern: sinogram
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
remove_stripe_sf:
pattern: sinogram
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
remove_stripe_based_sorting:
pattern: sinogram
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
remove_stripe_based_filtering:
pattern: sinogram
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
remove_stripe_based_fitting:
pattern: sinogram
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
remove_large_stripe:
pattern: sinogram
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
remove_dead_stripe:
pattern: sinogram
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
remove_stripe_based_interpolation:
pattern: sinogram
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
stripes_detect3d:
pattern: sinogram
implementation: cpu
output_dims_change: False
memory_gpu: None
save_result_default: False
padding: True
stripes_mask3d:
pattern: sinogram
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: True
recon:
algorithm:
recon:
pattern: sinogram
output_dims_change: True
implementation: cpu
memory_gpu: None
save_result_default: True
padding: False
rotation:
find_center:
pattern: projection
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
find_center_pc:
pattern: projection
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: True
padding: False
find_center_vo:
pattern: projection
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
wrappers:
astra:
pattern: sinogram
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
ufo_fbp:
pattern: sinogram
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
ufo_dfi:
pattern: sinogram
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
lprec:
pattern: sinogram
output_dims_change: True
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
Httomolibgpu’s library file
misc:
corr:
median_filter:
pattern: all
output_dims_change: False
implementation: gpu_cupy
save_result_default: False
padding: True
memory_gpu:
multiplier: 2.1
method: direct
remove_outlier:
pattern: all
output_dims_change: False
implementation: gpu_cupy
save_result_default: False
padding: True
memory_gpu:
multiplier: 2.1
method: direct
morph:
sino_360_to_180:
pattern: sinogram
output_dims_change: True
implementation: gpu_cupy
save_result_default: False
padding: False
memory_gpu:
multiplier: None
method: module
data_resampler:
pattern: all
output_dims_change: True
implementation: gpu_cupy
save_result_default: False
padding: False
memory_gpu:
multiplier: None
method: module
rescale:
rescale_to_int:
pattern: all
output_dims_change: False
implementation: gpu_cupy
save_result_default: False
padding: False
memory_gpu:
multiplier: None
method: module
prep:
normalize:
normalize:
pattern: projection
output_dims_change: False
implementation: gpu_cupy
save_result_default: False
padding: False
memory_gpu:
multiplier: None
method: module
phase:
paganin_filter_tomopy:
pattern: projection
output_dims_change: False
implementation: gpu_cupy
save_result_default: False
padding: False
memory_gpu:
multiplier: None
method: module
paganin_filter_savu:
pattern: projection
output_dims_change: False
implementation: gpu_cupy
save_result_default: False
padding: False
memory_gpu:
multiplier: None
method: module
alignment:
distortion_correction_proj_discorpy:
pattern: projection
output_dims_change: False
implementation: gpu_cupy
save_result_default: False
padding: False
memory_gpu:
multiplier: 1.2
method: direct
stripe:
remove_stripe_based_sorting:
pattern: sinogram
output_dims_change: False
implementation: gpu_cupy
save_result_default: False
padding: False
memory_gpu:
multiplier: 1.17
method: direct
remove_stripe_ti:
pattern: sinogram
output_dims_change: False
implementation: gpu_cupy
save_result_default: False
padding: False
memory_gpu:
multiplier: None
method: module
remove_all_stripe:
pattern: sinogram
output_dims_change: False
implementation: gpu_cupy
save_result_default: False
padding: False
memory_gpu:
multiplier: None
method: module
recon:
algorithm:
FBP:
pattern: sinogram
output_dims_change: True
implementation: gpu_cupy
save_result_default: True
padding: False
memory_gpu:
multiplier: None
method: module
SIRT:
pattern: sinogram
output_dims_change: True
implementation: gpu_cupy
save_result_default: True
padding: False
memory_gpu:
multiplier: None
method: module
CGLS:
pattern: sinogram
output_dims_change: True
implementation: gpu_cupy
save_result_default: True
padding: False
memory_gpu:
multiplier: None
method: module
rotation:
find_center_vo:
pattern: projection
output_dims_change: False
implementation: gpu_cupy
save_result_default: False
padding: False
memory_gpu:
multiplier: 0
method: direct
find_center_360:
pattern: projection
output_dims_change: False
implementation: gpu_cupy
save_result_default: False
padding: False
memory_gpu:
multiplier: 0
method: direct
find_center_pc:
pattern: projection
output_dims_change: False
implementation: gpu_cupy
save_result_default: False
padding: False
memory_gpu:
multiplier: 0
method: direct
Httomolib’s library file
misc:
morph:
data_reducer:
pattern: all
output_dims_change: True
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
images:
save_to_images:
pattern: all
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
segm:
binary_thresholding:
pattern: all
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
prep:
phase:
paganin_filter:
pattern: projection
output_dims_change: False
implementation: cpu
memory_gpu: None
save_result_default: False
padding: False
Grouping CPU/GPU methods#
There are different implementations of methods in Supported libraries, and can be classified into three categories:
cpu
methods. These are traditional CPU implementations in Python or other compiled languages. The exposed TomoPy functions are mostly pure CPU.gpu
methods. These are methods that use GPU devices and require an input array in CPU memory (e.g. Numpy ndarray).gpu_cupy
methods. These are a special group of methods, mostly from the HTTomolibgpu library, that are executed on GPU devices using the CuPy API. The main difference betweengpu_cupy
methods andgpu
methods is thatgpu_cupy
methods require CuPy arrays as input instead of Numpy arrays. The CuPy arrays are then kept in GPU memory across any consecutivegpu_cupy
methods until they are requested back on the CPU. This approach allows more flexibility with the sequences of GPU methods, as they can be chained together for more efficient processing.
Note
If GPUs are available to the user, it is recommended to use
gpu_cupy
or gpu
methods in process lists. The methods themselves
are usually optimised for performance and HTTomo will take care of chaining the
methods together to avoid unnecessary CPU-GPU data transfers.
The implementation of any supported method can be found in Library files.
Minimise writing to disk#
HTTomo does not require Saving intermediate files by default. If the result of a method is not needed as a separate file, then there is no reason for it to be written to disk. This is because saving intermediate files can significantly slow down the execution time.