*   Allow the XRTCompile op to return the ProgramShape resulted form the XLA
        compilation as a second return argument.
    *   XLA HLO graphs can now be rendered as SVG/HTML.
*   Estimator
    *   Replace all occurrences of `tf.contrib.estimator.BaselineEstimator` with
        `tf.estimator.BaselineEstimator`
    *   Replace all occurrences of

$variable-width: #{$fs-diff * 100 / $rfs-breakpoint}#{$variable-unit};\n\n      // Set the calculated font-size.\n      $rfs-fluid: calc(#{$min-width} + #{$variable-width}) #{$rfs-suffix};\n    }\n\n    // Rendering\n    @if $rfs-fluid == null {\n      // Only render static font-size if no fluid font-size is available\n      font-size: $rfs-static;\n    }\n    @else {\n      $mq-value: null;\n\n      // RFS breakpoint formatting\n      @if $rfs-breakpoint-unit == em or $rfs-breakpoint-unit == rem {\n        $mq-value:...