to_array(scalar) has bad error message

[jnothman]

text.to_array(spacy.attrs.LEMMA)

raises

ValueError: Buffer has wrong number of dimensions (expected 1, got 0)

when it should either work or be clearer in the error: it expects a list, not a single attr.

Info about spaCy

• spaCy version: 1.9.0
• Python version: 3.5.2
• Platform: Darwin-16.7.0-x86_64-i386-64bit
• Installed models: en

[honnibal]

Agreed, thanks.

I think we should make this work, i.e. LEMMA should be handled as [LEMMA]. We should handle "LEMMA" and "lemma" too.

[jnothman]

If you want text.to_array(spacy.attrs.LEMMA) to work, I would return a 1d array rather than 2d for consistency with numpy semantics.

[honnibal]

Does this describe the behaviour you expect? I added the option of an out=None array for further numpy consistency.

def to_array(self, attr_ids, out=None):
    """Export given token attributes to a numpy `ndarray`.

    If `attr_ids` is a sequence of M attributes, the output array will
    be of shape `(N, M)`, where N is the length of the `Doc`
    (in tokens). If `attr_ids` is a single attribute, the output shape will
    be (N,). You can specify attributes by integer ID (e.g. spacy.attrs.LEMMA)
    or string name (e.g. 'LEMMA' or 'lemma').

    By default, a new numpy array of dtype uint64 is created for the output.
    You can instead pass in an array using the `out` keyword argument.
    """

[jnothman]

Sounds good

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