v0.6.21

Zygote v0.6.21

Diff since v0.6.20

Closed issues:

• Relation to capstan and cassette.jl (#1)
• Error when taking gradient involving zeros(eltype(x), ...). (#72)
• Error when taking gradient involving a range broadcast (#73)
• Deprecation warning in tests (#76)
• Error when trying to define gradient for addition (#84)
• CUDA broadcast over * and + blows up taking gradient (#113)
• cholesky keywords (#121)
• Division causes f32 -> f64 conversion in backward pass (#136)
• differentiating over x isa NTuple{<:Any, <:Integer} causes julia crush (#158)
• simple MLP gradient fails when dropout is included (#171)
• BoundsError in mutable array branch (#172)
• Trouble with reshape() (#187)
• simple broadcast not working (#195)
• Lazy adjoint/transpose gradient fails (#213)
• getindex for Adjoint does not back-propagate (#217)
• Add support for logpdf of Poisson (#281)
• Gradients for cumsum and cumprod (#282)
• Support for tuple and function argument destructuring (#303)
• Cannot differentiate through dictionary (#817)
• Scalar indexing error from GPU matmul against Zygote.OneElement (#1005)
• documentation seems stale because of CI failure (#1021)
• Typo in docs? (#1056)
• Second derivatives not working (#1067)

Merged pull requests:

• Support functions that splat namedtuples as keyword arguments (#1059) (@oxinabox)
• fix pair getfield pullback (#1063) (@CarloLucibello)
• Don't use dual numbers in broadcasting within 2nd derivatives (#1068) (@mcabbott)
• Add short-circuit to rrule_via_ad (#1069) (@mcabbott)