jax.debug.print: respect local np.printoptions

Author: jakevdp

jax/_src/debugging.py

@@ -300,8 +300,9 @@ def check_unused_args(self, used_args, args, kwargs):
 
 formatter = _DebugPrintFormatChecker()
 
-def _format_print_callback(fmt: str, *args, **kwargs):
-  sys.stdout.write(fmt.format(*args, **kwargs) + "\n")
+def _format_print_callback(fmt: str, np_printoptions, *args, **kwargs):
+  with np.printoptions(**np_printoptions):
+    sys.stdout.write(fmt.format(*args, **kwargs) + "\n")
 
 def debug_print(fmt: str, *args, ordered: bool = False, **kwargs) -> None:
   """Prints values and works in staged out JAX functions.
@@ -338,8 +339,8 @@ def debug_print(fmt: str, *args, **kwargs):
   # Check that we provide the correct arguments to be formatted.
   formatter.format(fmt, *args, **kwargs)
 
-  debug_callback(functools.partial(_format_print_callback, fmt), *args,
-                 **kwargs, ordered=ordered)
+  debug_callback(functools.partial(_format_print_callback, fmt, np.get_printoptions()),
+                 *args, **kwargs, ordered=ordered)
 
 
 # Sharding visualization

tests/debugging_primitives_test.py

@@ -219,6 +219,29 @@ def f(x):
          [ 1  2  3  4  5  6  7  8  9 10 12 13 14]]
     """))
 
+  def test_debug_print_respects_numpy_printoptions(self):
+    def f(x):
+      with np.printoptions(precision=2, suppress=True):
+        jax.debug.print("{}", x)
+    x = np.array([1.2345, 2.3456, 1E-7])
+
+    # Default numpy print options:
+    with jtu.capture_stdout() as output:
+      jax.debug.print("{}", x)
+    self.assertEqual(output(), "[1.2345e+00 2.3456e+00 1.0000e-07]\n")
+
+    # Modified print options without JIT:
+    with jtu.capture_stdout() as output:
+      f(x)
+      jax.effects_barrier()
+    self.assertEqual(output(), "[1.23 2.35 0.  ]\n")
+
+    # Modified print options with JIT:
+    with jtu.capture_stdout() as output:
+      jax.jit(f)(x)
+      jax.effects_barrier()
+    self.assertEqual(output(), "[1.23 2.35 0.  ]\n")
+
 
 class DebugPrintTransformationTest(jtu.JaxTestCase):