Various improvements to scico.flax and related example scripts

CHANGES.rst

@@ -7,6 +7,9 @@ Version 0.0.6   (unreleased)
 ----------------------------
 
 • Significant changes to ``linop.xray.astra`` API.
+• Rename ``scico.flax.save_weights`` and ``scico.flax.load_weights`` to
+  ``scico.flax.save_variables`` and ``scico.flax.load_variables``
+  respectively.
 
 
 

docs/source/install.rst

@@ -130,6 +130,11 @@ a version with GPU support:
    numbers.
 
 
+The script `misc/envinfo.py <https://github.com/lanl/scico/blob/main/misc/envinfo.py>`_
+in the source distribution is provided as an aid to debugging GPU support
+issues.
+
+
 
 Additional Dependencies
 -----------------------

examples/jnb.py

@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-# Copyright (C) 2022-2023 by SCICO Developers
+# Copyright (C) 2022-2024 by SCICO Developers
 # All rights reserved. BSD 3-clause License.
 # This file is part of the SCICO package. Details of the copyright and
 # user license can be found in the 'LICENSE' file distributed with the
@@ -44,7 +44,7 @@ def py_file_to_string(src):
             else:
                 # Set flag indicating that an import statement has been seen once one has
                 # been encountered
-                if re.match("^(import|from)", line):
+                if re.match("^import|^from .* import", line):
                     import_seen = True
             lines.append(line)
         # Backtrack through list of lines to find last import statement
@@ -221,3 +221,25 @@ def replace_markdown_cells(src, dst):
         # the dst cell
         if srccell[n]["cell_type"] == "markdown":
             dstcell[n]["source"] = srccell[n]["source"]
+
+
+def remove_error_output(src):
+    """Remove output to stderr from all cells in `src`."""
+
+    if "cells" in src:
+        cells = src["cells"]
+    else:
+        cells = src["worksheets"][0]["cells"]
+
+    modified = False
+    for c in cells:
+        if "outputs" in c:
+            dellist = []
+            for n, out in enumerate(c["outputs"]):
+                if "name" in out and out["name"] == "stderr":
+                    dellist.append(n)
+                    modified = True
+            for n in dellist[::-1]:
+                del c["outputs"][n]
+
+    return modified

examples/removejnberr.py

@@ -0,0 +1,18 @@
+#!/usr/bin/env python
+
+# Remove output to stderr in notebooks. NB: use with caution!
+# Run as
+#     python removejnberr.py
+
+import glob
+import os
+
+from jnb import read_notebook, remove_error_output
+from py2jn.tools import write_notebook
+
+for src in glob.glob(os.path.join("notebooks", "*.ipynb")):
+    nb = read_notebook(src)
+    modflg = remove_error_output(nb)
+    if modflg:
+        print(f"Removing output to stderr from {src}")
+        write_notebook(nb, src)

examples/scripts/ct_astra_modl_train_foam2.py

@@ -54,7 +54,7 @@
 from scico import metric, plot
 from scico.flax.examples import load_ct_data
 from scico.flax.train.traversals import clip_positive, construct_traversal
-from scico.linop.xray.astra import XRayTransform
+from scico.linop.xray.astra import XRayTransform2D
 
 """
 Prepare parallel processing. Set an arbitrary processor count (only
@@ -81,9 +81,9 @@
 Build CT projection operator.
 """
 angles = np.linspace(0, np.pi, n_projection)  # evenly spaced projection angles
-A = XRayTransform(
+A = XRayTransform2D(
     input_shape=(N, N),
-    detector_spacing=1,
+    det_spacing=1,
     det_count=N,
     angles=angles,
 )  # CT projection operator
@@ -138,7 +138,7 @@
 
 
 """
-Construct functionality for making sure that the learned
+Construct functionality for ensuring that the learned
 regularization parameter is always positive.
 """
 lmbdatrav = construct_traversal("lmbda")  # select lmbda parameters in model
@@ -152,8 +152,8 @@
 """
 Print configuration of distributed run.
 """
-print(f"{'JAX process: '}{jax.process_index()}{' / '}{jax.process_count()}")
-print(f"{'JAX local devices: '}{jax.local_devices()}")
+print(f"\nJAX process: {jax.process_index()}{' / '}{jax.process_count()}")
+print(f"JAX local devices: {jax.local_devices()}\n")
 
 
 """
@@ -212,9 +212,8 @@
         cg_iter=model_conf["cg_iter_1"],
     )
     # First stage: initialization training loop.
-    workdir = os.path.join(os.path.expanduser("~"), ".cache", "scico", "examples", "modl_ct_out")
-
-    train_conf["workdir"] = workdir
+    workdir1 = os.path.join(os.path.expanduser("~"), ".cache", "scico", "examples", "modl_ct_out")
+    train_conf["workdir"] = workdir1
     train_conf["post_lst"] = [lmbdapos]
     # Construct training object
     trainer = sflax.BasicFlaxTrainer(

examples/scripts/ct_astra_odp_train_foam2.py

@@ -58,7 +58,7 @@
 from scico import metric, plot
 from scico.flax.examples import load_ct_data
 from scico.flax.train.traversals import clip_positive, construct_traversal
-from scico.linop.xray.astra import XRayTransform
+from scico.linop.xray.astra import XRayTransform2D
 
 """
 Prepare parallel processing. Set an arbitrary processor count (only
@@ -85,9 +85,9 @@
 Build CT projection operator.
 """
 angles = np.linspace(0, np.pi, n_projection)  # evenly spaced projection angles
-A = XRayTransform(
+A = XRayTransform2D(
     input_shape=(N, N),
-    detector_spacing=1,
+    det_spacing=1,
     det_count=N,
     angles=angles,
 )  # CT projection operator
@@ -138,7 +138,7 @@
 
 
 """
-Construct functionality for making sure that the learned fidelity weight
+Construct functionality for ensuring that the learned fidelity weight
 parameter is always positive.
 """
 alphatrav = construct_traversal("alpha")  # select alpha parameters in model
@@ -152,8 +152,8 @@
 """
 Print configuration of distributed run.
 """
-print(f"{'JAX process: '}{jax.process_index()}{' / '}{jax.process_count()}")
-print(f"{'JAX local devices: '}{jax.local_devices()}")
+print(f"\nJAX process: {jax.process_index()}{' / '}{jax.process_count()}")
+print(f"JAX local devices: {jax.local_devices()}\n")
 
 
 """
@@ -185,10 +185,7 @@
     train_ds,
     test_ds,
 )
-
-start_time = time()
 modvar, stats_object = trainer.train()
-time_train = time() - start_time
 
 
 """
@@ -215,13 +212,14 @@
 psnr_eval = metric.psnr(test_ds["label"][:maxn], output)
 print(
     f"{'ODPNet training':18s}{'epochs:':2s}{epochs:>5d}{'':21s}"
-    f"{'time[s]:':10s}{time_train:>7.2f}"
+    f"{'time[s]:':10s}{trainer.train_time:>7.2f}"
 )
 print(
     f"{'ODPNet testing':18s}{'SNR:':5s}{snr_eval:>5.2f}{' dB'}{'':3s}"
     f"{'PSNR:':6s}{psnr_eval:>5.2f}{' dB'}{'':3s}{'time[s]:':10s}{time_eval:>7.2f}"
 )
 
+
 """
 Plot comparison.
 """

examples/scripts/ct_astra_unet_train_foam2.py

@@ -104,21 +104,16 @@
 """
 workdir = os.path.join(os.path.expanduser("~"), ".cache", "scico", "examples", "unet_ct_out")
 train_conf["workdir"] = workdir
-print(f"{'JAX process: '}{jax.process_index()}{' / '}{jax.process_count()}")
-print(f"{'JAX local devices: '}{jax.local_devices()}")
+print(f"\nJAX process: {jax.process_index()}{' / '}{jax.process_count()}")
+print(f"JAX local devices: {jax.local_devices()}\n")
 
-
-# Construct training object
 trainer = sflax.BasicFlaxTrainer(
     train_conf,
     model,
     train_ds,
     test_ds,
 )
-
-start_time = time()
 modvar, stats_object = trainer.train()
-time_train = time() - start_time
 
 
 """
@@ -144,7 +139,7 @@
 psnr_eval = metric.psnr(test_ds["label"][:maxn], output)
 print(
     f"{'UNet training':15s}{'epochs:':2s}{train_conf['num_epochs']:>5d}"
-    f"{'':21s}{'time[s]:':10s}{time_train:>7.2f}"
+    f"{'':21s}{'time[s]:':10s}{trainer.train_time:>7.2f}"
 )
 print(
     f"{'UNet testing':15s}{'SNR:':5s}{snr_eval:>5.2f}{' dB'}{'':3s}"

examples/scripts/deconv_datagen_bsds.py

@@ -30,7 +30,6 @@
 blur_sigma = 5  # Gaussian blur kernel parameter
 
 opBlur = PaddedCircularConvolve(output_size, channels, blur_shape, blur_sigma)
-
 opBlur_vmap = vmap(opBlur)  # for batch processing
 
 
@@ -47,7 +46,6 @@
 stride = 100  # stride to sample multiple patches from each image
 augment = True  # augment data via rotations and flips
 
-
 train_ds, test_ds = load_image_data(
     train_nimg,
     test_nimg,

examples/scripts/deconv_modl_train_foam1.py

@@ -77,7 +77,6 @@
 
 ishape = (output_size, output_size)
 opBlur = CircularConvolve(h=psf, input_shape=ishape)
-
 opBlur_vmap = jax.vmap(opBlur)  # for batch processing in data generation
 
 
@@ -133,7 +132,7 @@
 
 
 """
-Construct functionality for making sure that the learned regularization
+Construct functionality for ensuring that the learned regularization
 parameter is always positive.
 """
 lmbdatrav = construct_traversal("lmbda")  # select lmbda parameters in model
@@ -147,8 +146,8 @@
 """
 Print configuration of distributed run.
 """
-print(f"{'JAX process: '}{jax.process_index()}{' / '}{jax.process_count()}")
-print(f"{'JAX local devices: '}{jax.local_devices()}")
+print(f"\nJAX process: {jax.process_index()}{' / '}{jax.process_count()}")
+print(f"JAX local devices: {jax.local_devices()}\n")
 
 
 """
@@ -204,9 +203,8 @@
         cg_iter=model_conf["cg_iter"],
     )
     # First stage: initialization training loop.
-    workdir = os.path.join(os.path.expanduser("~"), ".cache", "scico", "examples", "modl_dcnv_out")
-
-    train_conf["workdir"] = workdir
+    workdir1 = os.path.join(os.path.expanduser("~"), ".cache", "scico", "examples", "modl_dcnv_out")
+    train_conf["workdir"] = workdir1
     train_conf["post_lst"] = [lmbdapos]
     # Construct training object
     trainer = sflax.BasicFlaxTrainer(

examples/scripts/deconv_odp_train_foam1.py

@@ -85,7 +85,6 @@
 
 ishape = (output_size, output_size)
 opBlur = CircularConvolve(h=psf, input_shape=ishape)
-
 opBlur_vmap = jax.vmap(opBlur)  # for batch processing in data generation
 
 
@@ -153,7 +152,7 @@
 
 
 """
-Construct functionality for making sure that the learned fidelity weight
+Construct functionality for ensuring that the learned fidelity weight
 parameter is always positive.
 """
 alphatrav = construct_traversal("alpha")  # select alpha parameters in model
@@ -167,10 +166,10 @@
 """
 Run training loop.
 """
-workdir = os.path.join(os.path.expanduser("~"), ".cache", "scico", "examples", "odp_dcnv_out")
-print(f"{'JAX process: '}{jax.process_index()}{' / '}{jax.process_count()}")
-print(f"{'JAX local devices: '}{jax.local_devices()}")
+print(f"\nJAX process: {jax.process_index()}{' / '}{jax.process_count()}")
+print(f"JAX local devices: {jax.local_devices()}\n")
 
+workdir = os.path.join(os.path.expanduser("~"), ".cache", "scico", "examples", "odp_dcnv_out")
 train_conf["workdir"] = workdir
 train_conf["post_lst"] = [alphapos]
 # Construct training object
@@ -180,10 +179,7 @@
     train_ds,
     test_ds,
 )
-
-start_time = time()
 modvar, stats_object = trainer.train()
-time_train = time() - start_time
 
 
 """
@@ -210,7 +206,7 @@
 psnr_eval = metric.psnr(test_ds["label"][:maxn], output)
 print(
     f"{'ODPNet training':18s}{'epochs:':2s}{train_conf['num_epochs']:>5d}"
-    f"{'':21s}{'time[s]:':10s}{time_train:>7.2f}"
+    f"{'':21s}{'time[s]:':10s}{trainer.train_time:>7.2f}"
 )
 print(
     f"{'ODPNet testing':18s}{'SNR:':5s}{snr_eval:>5.2f}{' dB'}{'':3s}"

examples/scripts/denoise_dncnn_train_bsds.py

@@ -48,7 +48,6 @@
 noise_range = False  # Use fixed noise level
 stride = 23  # Stride to sample multiple patches from each image
 
-
 train_ds, test_ds = load_image_data(
     train_nimg,
     test_nimg,
@@ -105,19 +104,15 @@
 """
 workdir = os.path.join(os.path.expanduser("~"), ".cache", "scico", "examples", "dncnn_out")
 train_conf["workdir"] = workdir
-print(f"{'JAX process: '}{jax.process_index()}{' / '}{jax.process_count()}")
-print(f"{'JAX local devices: '}{jax.local_devices()}")
+print(f"\nJAX local devices: {jax.local_devices()}\n")
 
 trainer = sflax.BasicFlaxTrainer(
     train_conf,
     model,
     train_ds,
     test_ds,
 )
-
-start_time = time()
 modvar, stats_object = trainer.train()
-time_train = time() - start_time
 
 
 """
@@ -138,7 +133,7 @@
 psnr_eval = metric.psnr(test_ds["label"][:test_patches], output)
 print(
     f"{'DnCNNNet training':18s}{'epochs:':2s}{train_conf['num_epochs']:>5d}"
-    f"{'':21s}{'time[s]:':10s}{time_train:>7.2f}"
+    f"{'':21s}{'time[s]:':10s}{trainer.train_time:>7.2f}"
 )
 print(
     f"{'DnCNNNet testing':18s}{'SNR:':5s}{snr_eval:>5.2f}{' dB'}{'':3s}"
@@ -147,8 +142,8 @@
 
 
 """
-Plot comparison. Note that patches have small sizes, thus, plots may
-correspond to unidentifiable fragments.
+Plot comparison. Note that plots may display unidentifiable image
+fragments due to the small patch size.
 """
 np.random.seed(123)
 indx = np.random.randint(0, high=test_patches)