function dropout(x, level, noiseShape, seed) {
if (noiseShape != null && !_.isEqual(x.shape, noiseShape)) {
throw new errors_1.NotImplementedError('Non-default noise shape is not implemented yet: ' +
JSON.stringify(noiseShape));
}
if (seed != null) {
throw new errors_1.NotImplementedError('seed is not implemented for dropout yet.');
}
var multiplier = tfc.step(tfc.add(neg(level), randomUniform(x.shape, 0, 1, types_1.DType.float32)));
multiplier = tfc.mul(divide(getScalar(1), subtract(getScalar(1), level)), multiplier);
return tfc.mul(x, multiplier);
}
function decodeBoxesLayer(x0, x1) {
var _a = getCenterCoordinatesAndSizesLayer(x0), sizes = _a.sizes, centers = _a.centers;
var vec = tf.unstack(tf.transpose(x1, [1, 0]));
var div0_out = tf.div(tf.mul(tf.exp(tf.div(vec[2], tf.scalar(5))), sizes[0]), tf.scalar(2));
var add0_out = tf.add(tf.mul(tf.div(vec[0], tf.scalar(10)), sizes[0]), centers[0]);
var div1_out = tf.div(tf.mul(tf.exp(tf.div(vec[3], tf.scalar(5))), sizes[1]), tf.scalar(2));
var add1_out = tf.add(tf.mul(tf.div(vec[1], tf.scalar(10)), sizes[1]), centers[1]);
return tf.transpose(tf.stack([
tf.sub(add0_out, div0_out),
tf.sub(add1_out, div1_out),
tf.add(add0_out, div0_out),
tf.add(add1_out, div1_out)
]), [1, 0]);
}
function sigmoidCrossEntropyWithLogits(target, output) {
var maxOutput = tfc.maximum(output, tfc.zerosLike(output));
var outputXTarget = tfc.mul(output, target);
var sigmoidOutput = tfc.log(tfc.add(getScalar(1), tfc.exp(tfc.neg(tfc.abs(output)))));
var result = tfc.add(tfc.sub(maxOutput, outputXTarget), sigmoidOutput);
return result;
}
function categoricalCrossentropy(target, output, fromLogits) {
if (fromLogits === void 0) { fromLogits = false; }
if (fromLogits) {
output = softmax(output);
}
else {
var outputSum = sum(output, shape(output).length - 1, true);
output = divide(output, outputSum);
}
output = clip(output, exports.epsilon(), 1 - exports.epsilon());
return tfc.neg(tfc.sum(tfc.mul(target, tfc.log(output)), shape(output).length - 1));
}
function scalarTimesArray(c, x) {
return tfc.mul(c, x);
}
function multiply(x, y) {
return tfc.mul(x, y);
}