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Diffstat (limited to 'numpy/core/shape_base.py')
| -rw-r--r-- | numpy/core/shape_base.py | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/numpy/core/shape_base.py b/numpy/core/shape_base.py index 65c3ed00d..319c25088 100644 --- a/numpy/core/shape_base.py +++ b/numpy/core/shape_base.py @@ -446,7 +446,13 @@ def _block(arrays, max_depth, result_ndim): # type(arrays) is not list return atleast_nd(arrays, result_ndim) - return block_recursion(arrays) + try: + return block_recursion(arrays) + finally: + # recursive closures have a cyclic reference to themselves, which + # requires gc to collect (gh-10620). To avoid this problem, for + # performance and PyPy friendliness, we break the cycle: + block_recursion = None def block(arrays): |