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Editing: algebraic.zep

namespace Tensor;

interface Algebraic
{    
    const M_E = 2.7182818284590452354;

/**
     * Take the absolute value of the tensor.
     *
     * @return mixed
     */
    public function abs();

/**
     * Square the tensor.
     *
     * @return mixed
     */
    public function square();

/**
     * Return the square root of the tensor.
     *
     * @return mixed
     */
    public function sqrt();

/**
     * Return the exponential of the tensor.
     *
     * @return mixed
     */
    public function exp();

/**
     * Return the exponential of the tensor minus 1.
     *
     * @return mixed
     */
    public function expm1();

/**
     * Return the logarithm of the tensor in a specified base.
     *
     * @param float base
     * @return mixed
     */
    public function log(const float base = self::M_E);

/**
     * Return the log of 1 plus the tensor i.e. a transform.
     *
     * @return mixed
     */
    public function log1p();

/**
     * Round the elements in the tensor to a given decimal place.
     *
     * @param int precision
     * @return self
     */
    public function round(int precision = 0);

/**
     * Round the tensor down to the nearest integer.
     *
     * @return mixed
     */
    public function floor();

/**
     * Round the tensor up to the nearest integer.
     *
     * @return mixed
     */
    public function ceil();

/**
     * Return the element-wise sign indication.
     *
     * @return mixed
     */
    public function sign();

/**
     * Negate the tensor i.e take the negative.
     *
     * @return mixed
     */
    public function negate();
}

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