mapping: Add docstrings to make pydocstyle happy

src/mokka/mapping/numpy.py

@@ -1,3 +1,5 @@
+"""NumPy implementation of Mappers and Demappers."""
+
 import numpy as np
 from ..utils.bitops import gray
 from scipy import interpolate as interp
@@ -9,10 +11,13 @@
 
 class QAM:
     """
-    Arbitrarily sized QAM constellation with gray mapping
+    Arbitrarily sized QAM constellation with gray mapping.
+
+    :param m: Information per symbol [bit/symbol]
     """
 
     def __init__(self, m):
+        """Construct QAM class."""
         if m % 2:
             raise ValueError(
                 "Only bits/per Symbol which are multiple of 2 are supported"
@@ -36,11 +41,24 @@ def __init__(self, m):
         )
 
     def get_constellation(self):
+        """
+        Return all constellation symbols.
+
+        The index represents the integer representation of
+        the encoded bit-string (LSB first).
+
+        :returns: all constellation symbols
+        """
         bits = generate_all_bits(self.m)
         symbols = self.map(bits)
         return symbols
 
     def map(self, bits):
+        """
+        Perform mapping of bitstrings.
+
+        :returns: complex symbol per bitstring of length `self.m`
+        """
         output = []
         for seq in bits.reshape(-1, self.m):
             # Take first half for real and second half for imag