final commit before deadline - segmentation fault still present

README.md

@@ -10,7 +10,7 @@ SVRG with a projected gradient descent warm start and armijo line searches.
 SVRG minimises a sum of differentiable functions, $x^* = \underset{x}{\text{arg min}}\sum_n f_n(x)$. It approximates the gradient at each iteration by
 $$
 \begin{equation}
-    g^{(k)} = n\left(\nabla_n f(x^{(k)}) - \nabla_n f(\tilde{x})\right) + \nabla f(\tilde{x})
+    g^{(k)} = N\left(\nabla_n f(x^{(k)}) - \nabla_n f(\tilde{x})\right) + \nabla f(\tilde{x})
 \end{equation}
 $$
 where N is the number of sub-functions and $\tilde{x}$ is an anchor point where a full gradient has been calculated.

main.py

@@ -8,14 +8,12 @@
 >>> algorithm.run(np.inf, callbacks=metrics + submission_callbacks)
 """
 #%%
-from sirf.STIR import AcquisitionData
-AcquisitionData.set_storage_scheme('memory')
 from cil.optimisation.algorithms import ISTA, Algorithm
 from cil.optimisation.functions import IndicatorBox, SVRGFunction
 from cil.optimisation.utilities import (Preconditioner, Sampler,
                                         StepSizeRule)
-from petric import Dataset
 from sirf.contrib.partitioner import partitioner
+from petric import Dataset
 import numpy as np
 import numbers
 
@@ -240,11 +238,15 @@ def __init__(self, data: Dataset, update_objective_interval=10):
         decay_perc = 0.1
         decay = (1/(1-decay_perc) - 1)/update_interval
         beta = 0.5
+
+        print(f"Using {self.num_subsets} subsets")
 
         _, _, obj_funs = partitioner.data_partition(data.acquired_data, data.additive_term,
                                                                     data.mult_factors, self.num_subsets, mode='staggered',
                                                                     initial_image=data.OSEM_image)
 
+        print("made it past partitioner")
+
         data.prior.set_penalisation_factor(data.prior.get_penalisation_factor() / len(obj_funs))
         data.prior.set_up(data.OSEM_image)