tensorflow/contrib/solvers. Initial version has lanczos bidiagonalization,
    conjugate gradients and CGLS.
*   Added gradients for `matrix_solve_ls` and `self_adjoint_eig`.
*   Large cleanup to add second order gradient for ops with C++ gradients and
    improve existing gradients such that most ops can now be differentiated
    multiple times.
*   Added a solver for ordinary differential equations,

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\n    background-color: $background;\n    border-color: $border;\n    // Remove CSS gradients if they're enabled\n    @if $enable-gradients {\n      background-image: none;\n    }\n  }\n\n  &:not(:disabled):not(.disabled):active,\n  &:not(:disabled):not(.disabled).active,\n  .show > &.dropdown-toggle {\n    color: color-yiq($active-background);\n    background-color: $active-background;\n    @if $enable-gradients {\n      background-image: none; // Remove the gradient for the pressed/active state\n...