*   Add support for passing list of lists to the `metrics` argument in Keras
        `compile`.
    *   Add `tf.keras.layers.AbstractRNNCell` as the preferred implementation
        for RNN cells in TF v2. User can use it to implement RNN cells with
        custom behavior.
    *   Keras training and validation curves are shown on the same plot when
        using the TensorBoard callback.

background-color: $background;\n    }\n\n    @if $border != null {\n      th,\n      td,\n      thead th,\n      tbody + tbody {\n        border-color: $border;\n      }\n    }\n  }\n\n  // Hover states for `.table-hover`\n  // Note: this is not available for cells or rows within `thead` or `tfoot`.\n  .table-hover {\n    $hover-background: darken($background, 5%);\n\n    .table-#{$state} {\n      @include hover() {\n        background-color: $hover-background;\n\n        > td,\n        > th {\n          background-color:...

background-color: $background;\n    }\n\n    @if $border != null {\n      th,\n      td,\n      thead th,\n      tbody + tbody {\n        border-color: $border;\n      }\n    }\n  }\n\n  // Hover states for `.table-hover`\n  // Note: this is not available for cells or rows within `thead` or `tfoot`.\n  .table-hover {\n    $hover-background: darken($background, 5%);\n\n    .table-#{$state} {\n      @include hover() {\n        background-color: $hover-background;\n\n        > td,\n        > th {\n          background-color:...