Closed tamasgal closed 4 years ago
You might try to see if .lazyarray(chunked=False)
works better. VirtualArrays are more well-tested than ChunkedArrays. If you need to limit the array size, the entrystart
and entrystop
parameters can function to limit them.
It's the same as with .array()
. Here is the full output of all three approaches:
[ins] In [8]: rs = f['E']['Evt']['trks']['trks.rec_stages'].lazyarray(chunked=Fa
...: lse)
[ins] In [9]: rs[:, 0]
Out[9]:
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[ins] In [10]: rs = f['E']['Evt']['trks']['trks.rec_stages'].array()
[ins] In [11]: rs[:, 0]
Out[11]:
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[ins] In [12]: rs = f['E']['Evt']['trks']['trks.rec_stages'].lazyarray()
[ins] In [13]: rs[:, 0]
Out[13]: <ChunkedArray [[0 0 0 ... 0 0 1] [0 0 0 ... 0 0 1] [0 0 0 ... 0 0 1] ... [0 0 0 ... 0 0 1] [0 0 0 ... 0 0 1] [0 0 0 ... 0 0 1]] at 0x0001031d4d90>
[ins] In [14]: rs[:, 0][0]
Out[14]:
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Any ideas? I guess you are very busy with awkward 1.0 so maybe it’s even worth to wait for that and its integration into uproot. Not sure about the timeline though.
I just got a chance to triage this today. I had been worried that it might be a bug in the ChunkedArray
you get from lazyarrays
(as @nsmith- can attest, this one has caused us a lot of trouble), but actually it's a misunderstanding of the ObjectArrays
you get from arrays
. You're not the first, and ObjectArrays
are too confusing to be allowed to live—they're being removed from Awkward 1.0.
To start with, note that array
and lazyarray
give the same meaning of the data, at the level of lists:
import uproot
branch = uproot.open("issue229.root")["E"]["trks.rec_stages"]
fromarray = branch.array()[:, 0]
fromlazyarray = branch.lazyarray()[:, 0]
[x.tolist() for x in fromarray] == fromlazyarray.tolist()
# returns True
and also
import awkward
awkward.fromiter(fromarray)
awkward.fromiter(fromarray).tolist() == fromlazyarray.tolist()
# returns True
You only get a different answer if you eliminate the effect of ObjectArrays
with awkward.fromiter
:
fromawkward = awkward.fromiter(branch.array())
fromawkward[:, 0].tolist() == fromlazyarray.tolist()
# returns False!
The key point is that deep slices (slices that are tuples, like (slice(None), 0)
) don't cross from non-ObjectArrays
into ObjectArrays
. Perhaps what you're reporting is an error; perhaps it should have raised an exception if you even try to. Your ObjectArray
is a one-dimensional array of Python lists; each Python list is generated on demand (deserializing the unsplit ROOT data), and the ObjectArray
doesn't know that they're all going to be lists with the same depth.
NumPy's object arrays have the same issue: if dtype
is "O"
, then a slice like (slice(None), 0)
couldn't be applied to this one-dimensional array of Python lists (although it nicely raises an IndexError
).
numpy.array(branch.array())[:, 0]
# Traceback (most recent call last):
# File "<stdin>", line 1, in <module>
# IndexError: too many indices for array
I made a wrong design choice by introducing ObjectArray
: it delays evaluation of the (expensive) unsplit-list deserialization by introducing an opaque type that doesn't work like any other data. In Awkward 1.0, the unsplit-list deserialization will be over an order of magnitude faster (no longer the very noticeable performance hit) as shown on page 14/16 of this talk, and the Methods
and ObjectArray
mechanisms will be replaced by a single non-opaque mechanism as shown in this section of the Coffea demo.
So, not a bug, but exactly the sort of confusing feature that will be eliminated by transitioning to Awkward 1.0.
I discovered this behaviour while I was processing data read by
uproot
, but it seems it'sawkward
related.The data I read it has doubly nested lists and it seems that slicing is different on
ChunkedArrays
orObjectArrays
(which are returned by thelazyarray()
respectivelyarray()
method of theuproot
branch). However, when I pass the data into a constructor ofJaggedArray
, the slicing does what is "should".Here, I try to access the first element (which is a list) of each sublist using a
[:, 0]
slice. TheChunkedArray
returns weird values, however, if I put it intoawkward.array.from_iter
and slice afterwards, I get the correct values.Here is the file I used: dummy.root.zip
I played around with different methods but could not get it work...