}

  /**
   * Asserts that {@code transformation} is diagonal (i.e. neither horizontal nor vertical) and
   * passes through both {@code (x1, y1)} and {@code (x1 + xDelta, y1 + yDelta)}. Includes
   * assertions about all the public instance methods of {@link LinearTransformation} (on both
   * {@code transformation} and its inverse). Since the transformation is expected to be diagonal,
   * neither {@code xDelta} nor {@code yDelta} may be zero.

line2 := Line{name: "diagonal", q: Point3D{1, 1, 1}}      // zero value for line2.Object.color, line2.p
</pre>

<p>
but field selectors may not denote overlapping fields:
</p>

<pre>
obj   := Object{"edge", "black"}
line3 := Line{Object: obj, name: "diagonal"}              // invalid: name denotes a field inside Object
</pre>

*   `tf.lite`:

    *   Add 16-bit float type support for built-in op `fill`.
    *   Transpose now supports 6D tensors.
    *   Float LSTM now supports diagonal recurrent tensors: https://arxiv.org/abs/1903.08023

*   `tf.experimental.dtensor`:

    *   Coordination service now works with `dtensor.initialize_accelerator_system`, and enabled by default.