espnet2.enh.layers.dnsmos.poly1d

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espnet2.enh.layers.dnsmos.poly1d(coefficients, use_numpy=False)

Construct a polynomial function from given coefficients.

This function creates a polynomial function of the form: f(x) = a_n * x^n + a_(n-1) * x^(n-1) + … + a_1 * x + a_0 where the coefficients are provided in the list coefficients in the order of highest degree to lowest.

If use_numpy is set to True, the function returns a numpy polynomial object instead of a custom function.

• Parameters:
  • coefficients (list or tuple) – Coefficients of the polynomial, where the first element is the coefficient of the highest degree.
  • use_numpy (bool) – If True, return a numpy polynomial object. Defaults to False.
• Returns: A polynomial function that can be called with a single argument or a numpy polynomial object.
• Return type: function or np.poly1d

Examples

>>> p = poly1d([1, -3, 2])  # Creates the polynomial x^2 - 3x + 2
>>> p(1)  # Output: 0
>>> p(2)  # Output: 0
>>> p(3)  # Output: 2

>>> np_poly = poly1d([1, -3, 2], use_numpy=True)
>>> np_poly(1)  # Output: 0
>>> np_poly(2)  # Output: 0
>>> np_poly(3)  # Output: 2