[GitHub] [incubator-mxnet] haojin2 commented on a change in pull request #16788: [Numpy][TVM]Add numpy operator 'polyval' based on tvm

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haojin2 commented on a change in pull request #16788: [Numpy][TVM]Add numpy operator 'polyval' based on tvm
URL: https://github.com/apache/incubator-mxnet/pull/16788#discussion_r346099563
 
 

 ##########
 File path: python/mxnet/ndarray/numpy/_op.py
 ##########
 @@ -5308,3 +5308,60 @@ def nan_to_num(x, copy=True, nan=0.0, posinf=None, neginf=None, **kwargs):
         return _npi.nan_to_num(x, copy=copy, nan=nan, posinf=posinf, neginf=neginf, out=None)
     else:
         raise TypeError('type {} not supported'.format(str(type(x))))
+
+
+def polyval(p, x):
+    """
+    Evaluate a polynomial at specific values.
+
+    If p is of length N, this function returns the value:
+
+    p[0]*x**(N-1) + p[1]*x**(N-2) + ... + p[N-2]*x + p[N-1]
+    If x is a sequence, then p(x) is returned for each element of x.
+    If x is another polynomial then the composite polynomial p(x(t)) is returned.
+
+    Parameters
+    ----------
+    p : ndarray
+        1D array of polynomial coefficients (including coefficients equal to zero)
+        from highest degree to the constant term.
+    x : ndarray
+        An array of numbers, at which to evaluate p.
+
+    Returns
+    -------
+    values : ndarray
+        Result array of polynomials
+
+    Notes
+    -----
+    Horner’s scheme is used to evaluate the polynomial.
+    Even so, for polynomials of high degree the values may be
 
 Review comment:
   Seems like there's a non-ascii code character on this line.

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