Add LBFGS cupy example

templates/engines/moonflower_LBFGS_cupy.py

@@ -0,0 +1,62 @@
+"""
+This script is a test for ptychographic reconstruction in the absence
+of actual data. It uses the test Scan class
+`ptypy.core.data.MoonFlowerScan` to provide "data".
+"""
+
+from ptypy.core import Ptycho
+from ptypy import utils as u
+import ptypy
+ptypy.load_gpu_engines(arch="cuda")
+from ptypy.custom import LBFGS_cupy
+
+import tempfile
+tmpdir = tempfile.gettempdir()
+
+p = u.Param()
+
+# for verbose output
+p.verbose_level = "info"
+p.frames_per_block = 400
+# set home path
+p.io = u.Param()
+p.io.home =  "/".join([tmpdir, "ptypy"])
+p.io.autosave = u.Param(active=False)
+p.io.autoplot = u.Param(active=False)
+p.io.interaction = u.Param(active=False)
+
+# max 200 frames (128x128px) of diffraction data
+p.scans = u.Param()
+p.scans.MF = u.Param()
+# now you have to specify which ScanModel to use with scans.XX.name,
+# just as you have to give 'name' for engines and PtyScan subclasses.
+p.scans.MF.name = 'BlockFull'
+p.scans.MF.data= u.Param()
+p.scans.MF.data.name = 'MoonFlowerScan'
+p.scans.MF.data.shape = 128
+p.scans.MF.data.num_frames = 100
+p.scans.MF.data.save = None
+
+p.scans.MF.illumination = u.Param(diversity=None)
+p.scans.MF.coherence = u.Param(num_probe_modes=1)
+# position distance in fraction of illumination frame
+p.scans.MF.data.density = 0.2
+# total number of photon in empty beam
+p.scans.MF.data.photons = 1e8
+# Gaussian FWHM of possible detector blurring
+p.scans.MF.data.psf = 0.
+
+# attach a reconstrucion engine
+p.engines = u.Param()
+p.engines.engine00 = u.Param()
+p.engines.engine00.name = 'LBFGS_cupy'
+p.engines.engine00.numiter = 300
+p.engines.engine00.numiter_contiguous = 5
+p.engines.engine00.reg_del2 = True                      # Whether to use a Gaussian prior (smoothing) regularizer
+p.engines.engine00.reg_del2_amplitude = 1.             # Amplitude of the Gaussian prior if used
+p.engines.engine00.scale_precond = True
+p.engines.engine00.floating_intensities = False
+
+# prepare and run
+if __name__ == "__main__":
+    P = Ptycho(p,level=5)