Add matmul example that validates result (#244)

Author: tomwhite

examples/lithops/gcf/lithops-matmul-ones.py

@@ -0,0 +1,39 @@
+import logging
+import sys
+
+from tqdm.contrib.logging import logging_redirect_tqdm
+
+import cubed
+import cubed.array_api as xp
+import cubed.random
+from cubed.extensions.history import HistoryCallback
+from cubed.extensions.timeline import TimelineVisualizationCallback
+from cubed.extensions.tqdm import TqdmProgressBar
+from cubed.runtime.executors.lithops import LithopsDagExecutor
+
+logging.basicConfig(level=logging.INFO)
+# suppress harmless connection pool warnings
+logging.getLogger("urllib3.connectionpool").setLevel(logging.ERROR)
+
+if __name__ == "__main__":
+    tmp_path = sys.argv[1]
+    runtime = sys.argv[2]
+    spec = cubed.Spec(tmp_path, allowed_mem="2GB")
+    executor = LithopsDagExecutor()
+
+    # Note we use default float dtype, since np.matmul is not optimized for ints
+    a = xp.ones((50000, 50000), chunks=(5000, 5000), spec=spec)
+    b = xp.ones((50000, 50000), chunks=(5000, 5000), spec=spec)
+    c = xp.matmul(a, b)
+    d = xp.all(c == 50000)
+    with logging_redirect_tqdm():
+        progress = TqdmProgressBar()
+        hist = HistoryCallback()
+        timeline_viz = TimelineVisualizationCallback()
+        res = d.compute(
+            executor=executor,
+            callbacks=[progress, hist, timeline_viz],
+            runtime=runtime,
+            runtime_memory=2048,  # Note that Lithops/Google Cloud Functions only accepts powers of 2 for this argument.
+        )
+        assert res, "Validation failed"