Fix denominator computation in KDense
#11
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* Fix computation of `grid_span`. * Use `denominator=nothing` as kwarg default to choose a reasonable denominator if `grid_lims` are chosen other than `(-1, 1)`. Note: this will modify the behavior for `normalizer ∈ (sigmoid, sigmoid_fast)`, changing denominator from `2/(grid_len-1)` to `1/(grid_len-1)`.
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grid_span.denominator=nothingas kwarg default to choose a reasonable denominator ifgrid_limsare chosen other than(-1, 1). Note: this will modify the behavior fornormalizer ∈ (sigmoid, sigmoid_fast)andgrid_lims=nothing, changing denominator from2/(grid_len-1)to1/(grid_len-1).Hit this when trying to work with custom
grid_lims, which without this change requires passing a handcrafteddenominatorto work properly.