style core_runtime stroke:#1abc9c,fill:#b1f4e7,stroke-width:2px,color:#000;

        core_configuration["core-configuration module"]
        style core_configuration stroke:#1abc9c,fill:#b1f4e7,stroke-width:2px,color:#000;

        core_execution["core-execution module"]
        style core_execution stroke:#1abc9c,fill:#b1f4e7,stroke-width:2px,color:#000;
    end
    style core fill:#c2e0f4,stroke:#3498db,stroke-width:2px,color:#000;

<!-- Do not add breaking changes or deprecations here! Add them to the upgrade guide instead. -->

<!--

================== TEMPLATE ==============================

<a name="FILL-IN-KEY-AREA"></a>
### FILL-IN-KEY-AREA improvements

<<<FILL IN CONTEXT FOR KEY AREA>>>
Example:
> The [configuration cache](userguide/configuration_cache.html) improves build performance by caching the result of

// constant with size equal or greater to this threshold, then it will be
// unfolded back to a regular `tfl.fill` operation.
constexpr int64_t kConstantSizeThresholdInBits = 1e+6;

// Pass which will replace large splat constant tensors to `tfl.Fill` op to
// reduce the size of the generated flatbuffer model size.
class UnfoldLargeSplatConstantPass
    : public impl::UnfoldLargeSplatConstantPassBase<

    // Fill quantization related attributes for Hybrid op.
    if (failed(FillQuantizationAttributes(rewriter, op, attrs,
                                          identifier_to_attr,
                                          OpType::kDynamicRangeOp))) {
      return failure();
    }
  } else {
    // Fill quantization related attributes for fully quantized op.

<!-- Do not add breaking changes or deprecations here! Add them to the upgrade guide instead. -->

<!--

================== TEMPLATE ==============================

<a name="FILL-IN-KEY-AREA"></a>
### FILL-IN-KEY-AREA improvements

<<<FILL IN CONTEXT FOR KEY AREA>>>
Example:
> The [configuration cache](userguide/configuration_cache.html) improves build performance by caching the result of

	// test indicates whether this instance of the struct was made for testing purposes.
	test bool

	bucket struct {
		// Invariants:
		// - fill >= 0
		// - capacity >= 0
		// - fill <= capacity
		fill, capacity uint64
	}
	// overflow is the cumulative amount of GC CPU time that we tried to fill the
	// bucket with but exceeded its capacity.
	overflow uint64

	// assistTimePool is the accumulated assist time since the last update.

  // CHECK-NEXT: %[[FULL_0:.*]] = "tf.Fill"(%[[SHAPE_0]], %[[ELEM_0]]) {ici_weight_distribution_mlir_bridge_marker = true}
  // CHECK:      %[[ELEM_1:.*]] = "tf.Const"()
  // CHECK:      {ici_weight_distribution_mlir_bridge_marker = true}
  // CHECK-NEXT: %[[SHAPE_1:.*]] = "tf.Const"()
  // CHECK:      {ici_weight_distribution_mlir_bridge_marker = true}

  %cst = "tf.Const"() <{value = dense<0.000000e+00> : tensor<f32>}> : () -> tensor<f32>
  %cst_0 = "tf.Const"() <{value = dense<1> : tensor<1xi64>}> : () -> tensor<1xi64>
  %fill = "tf.Fill"(%cst_0, %cst) : (tensor<1xi64>, tensor<f32>) -> tensor<1xf32>
  tf_device.replicate([%0, %fill] as %arg_r0: tensor<1xf32>) {n = 2 : i32} {
    %1 = "tf_device.launch"() <{device = "TPU_REPLICATED_HOST_0"}> ({
      %2 = "tf.Identity"(%arg_r0) : (tensor<1xf32>) -> tensor<1xf32>

            String statusPrefix = trimToConsole(consoleCols, 0, progressBarPrefix);
            String coloredProgress = trimToConsole(consoleCols, statusPrefix.length(), fill(fillerChar, completedWidth));
            String statusSuffix = trimToConsole(consoleCols, coloredProgress.length(), fill(incompleteChar, remainingWidth)
                + progressBarSuffix + " " + (int) (current * 100.0 / total) + '%' + ' ' + suffix

			t.Errorf(testname+" (fill 2): m == %d, expected %d", m, len(fus))
		}
		if err != nil {
			t.Errorf(testname+" (fill 3): err should always be nil, found err == %s", err)
		}
		s += fus
		check(t, testname+" (fill 4)", buf, s)
	}
	return s
}

// Fill buf through n writes of byte slice fub.
// The initial contents of buf corresponds to the string s;
// the result is the final contents of buf returned as a string.