Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/4096#discussion_r23138627
--- Diff: python/pyspark/mllib/linalg.py ---
@@ -335,6 +335,8 @@ def __init__(self, size, *args):
self.indices = np.array(args[0], dtype=np.int32)
self.values = np.array(args[1], dtype=np.float64)
assert len(self.indices) == len(self.values), "index and value
arrays not same length"
+ if np.any(self.indices < 0):
+ raise ValueError("indices should be positive.")
--- End diff --
should it be non-negative?
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