src/Gargantext/Prelude.hs

   1 {-|
   2 Module      : Gargantext.Prelude
   3 Description : Specific Prelude of the project
   4 Copyright   : (c) CNRS, 2017-Present
   5 License     : AGPL + CECILL v3
   6 Maintainer  : team@gargantext.org
   7 Stability   : experimental
   8 Portability : POSIX
   9
  10 Here is a longer description of this module, containing some
  11 commentary with @some markup@.
  12 -}
  13
  14 {-# OPTIONS_GHC -fno-warn-name-shadowing #-}
  15 {-# OPTIONS_GHC -fno-warn-type-defaults  #-}
  16
  17 {-# LANGUAGE     NoImplicitPrelude       #-}
  18
  19 module Gargantext.Prelude
  20   ( module Gargantext.Prelude
  21   , module Protolude
  22   , headMay, lastMay
  23   , module GHC.Err.Located
  24   , module Text.Show
  25   , module Text.Read
  26   , cs
  27   , module Data.Maybe
  28   , sortWith
  29   )
  30   where
  31
  32 import GHC.Exts (sortWith)
  33 import GHC.Err.Located (undefined)
  34 import Control.Monad.IO.Class (MonadIO)
  35 import Data.Maybe (isJust, fromJust, maybe)
  36 import Protolude ( Bool(True, False), Int, Int64, Double, Integer
  37                  , Fractional, Num, Maybe(Just,Nothing)
  38                  , Enum, Bounded, Float
  39                  , Floating, Char, IO
  40                  , pure, (>>=), (=<<), (<*>), (<$>)
  41                  , putStrLn
  42                  , head, flip
  43                  , Ord, Integral, Foldable, RealFrac, Monad, filter
  44                  , reverse, map, mapM, zip, drop, take, zipWith
  45                  , sum, fromIntegral, length, fmap, foldl, foldl'
  46                  , takeWhile, sqrt, identity
  47                  , abs, min, max, maximum, minimum, return, snd, truncate
  48                  , (+), (*), (/), (-), (.), ($), (&), (**), (^), (<), (>), log
  49                  , Eq, (==), (>=), (<=), (<>), (/=)
  50                  , (&&), (||), not, any, all
  51                  , fst, snd, toS
  52                  , elem, die, mod, div, const, either
  53                  , curry, uncurry, repeat
  54                  , otherwise, when
  55                  , IO()
  56                  , compare
  57                  , on
  58                  , panic
  59                  )
  60
  61 -- TODO import functions optimized in Utils.Count
  62 -- import Protolude hiding (head, last, all, any, sum, product, length)
  63 -- import Gargantext.Utils.Count
  64 import qualified Data.List     as L hiding (head, sum)
  65 import qualified Control.Monad as M
  66
  67 import Data.Map (Map)
  68 import qualified Data.Map as M
  69
  70 import Data.Map.Strict (insertWith)
  71 import qualified Data.Vector as V
  72 import Safe (headMay, lastMay)
  73 import Text.Show (Show(), show)
  74 import Text.Read (Read())
  75 import Data.String.Conversions (cs)
  76
  77
  78 printDebug :: (Show a, MonadIO m) => [Char] -> a -> m ()
  79 printDebug msg x = putStrLn $ msg <> " " <> show x
  80 -- printDebug _ _ = pure ()
  81
  82
  83 map2 :: (t -> b) -> [[t]] -> [[b]]
  84 map2 fun = map (map fun)
  85
  86
  87 -- Some Statistics sugar functions
  88 -- Exponential Average
  89 eavg :: [Double] -> Double
  90 eavg (x:xs) = a*x + (1-a)*(eavg xs)
  91   where a = 0.70
  92 eavg [] = 0
  93
  94 -- Simple Average
  95 mean :: Fractional a => [a] -> a
  96 mean xs = if L.null xs then 0.0
  97                        else sum xs / fromIntegral (length xs)
  98
  99
 100 sumMaybe :: Num a => [Maybe a] -> Maybe a
 101 sumMaybe = fmap sum . M.sequence
 102
 103 variance :: Floating a => [a] -> a
 104 variance xs = mean $ map (\x -> (x - m) ** 2) xs where
 105     m = mean xs
 106
 107 deviation :: [Double] -> Double
 108 deviation = sqrt . variance
 109
 110 movingAverage :: (Eq b, Fractional b) => Int -> [b] -> [b]
 111 movingAverage steps xs = map mean $ chunkAlong steps 1 xs
 112
 113 ma :: [Double] -> [Double]
 114 ma = movingAverage 3
 115
 116 -- | splitEvery n == chunkAlong n n
 117 splitEvery :: Int -> [a] -> [[a]]
 118 splitEvery _ [] = []
 119 splitEvery n xs =
 120   let (h,t) = L.splitAt n xs
 121   in  h : splitEvery n t
 122
 123 type Grain = Int
 124 type Step  = Int
 125
 126 -- | Function to split a range into chunks
 127 chunkAlong :: Eq a => Grain -> Step -> [a] -> [[a]]
 128 chunkAlong a b l = case a > 0 && b > 0 && a >= b of
 129     True  -> chunkAlong_ a b l
 130     False -> panic "ChunkAlong: Parameters should be > 0 and Grain > Step"
 131
 132 chunkAlong_ :: Eq a => Int -> Int -> [a] -> [[a]]
 133 chunkAlong_ a b l = filter (/= []) $ only (while dropAlong)
 134     where
 135         only      = map       (take a)
 136         while     = takeWhile (\x -> length x >= a)
 137         dropAlong = L.scanl   (\x _y -> drop b x) l ([1..] :: [Integer])
 138
 139 -- | Optimized version (Vector)
 140 chunkAlong' :: Int -> Int -> V.Vector a -> V.Vector (V.Vector a)
 141 chunkAlong' a b l = only (while  dropAlong)
 142     where
 143         only      = V.map       (V.take a)
 144         while     = V.takeWhile (\x -> V.length x >= a)
 145         dropAlong = V.scanl     (\x _y -> V.drop b x) l (V.fromList [1..])
 146
 147 -- | TODO Inverse of chunk ? unchunkAlong ?
 148 -- unchunkAlong :: Int -> Int -> [[a]] -> [a]
 149 -- unchunkAlong = undefined
 150
 151
 152 -- splitAlong [2,3,4] ("helloworld" :: [Char]) == ["he", "llo", "worl", "d"]
 153 splitAlong :: [Int] -> [Char] -> [[Char]]
 154 splitAlong _ [] = [] -- No list? done
 155 splitAlong [] xs = [xs] -- No place to split at? Return the remainder
 156 splitAlong (x:xs) ys = take x ys : splitAlong xs (drop x ys) -- take until our split spot, recurse with next split spot and list remainder
 157
 158 takeWhileM :: (Monad m) => (a -> Bool) -> [m a] -> m [a]
 159 takeWhileM _ [] = return []
 160 takeWhileM p (a:as) = do
 161     v <- a
 162     if p v
 163         then do
 164             vs <- takeWhileM p as
 165             return (v:vs)
 166         else return []
 167
 168 -- SUMS
 169 -- To select the right algorithme according to the type:
 170 -- https://github.com/mikeizbicki/ifcxt
 171
 172 sumSimple :: Num a => [a] -> a
 173 sumSimple = L.foldl' (+) 0
 174
 175 -- | https://en.wikipedia.org/wiki/Kahan_summation_algorithm
 176 sumKahan :: Num a => [a] -> a
 177 sumKahan = snd . L.foldl' go (0,0)
 178     where
 179         go (c,t) i = ((t'-t)-y,t')
 180             where
 181                 y  = i-c
 182                 t' = t+y
 183
 184 -- | compute part of the dict
 185 count2map :: (Ord k, Foldable t) => t k -> Map k Double
 186 count2map xs = M.map (/ (fromIntegral (length xs))) (count2map' xs)
 187
 188 -- | insert in a dict
 189 count2map' :: (Ord k, Foldable t) => t k -> Map k Double
 190 count2map' xs = L.foldl' (\x y -> insertWith (+) y 1 x) M.empty xs
 191
 192
 193 trunc :: (RealFrac a, Integral c, Integral b) => b -> a -> c
 194 trunc n = truncate . (* 10^n)
 195
 196 trunc' :: Int -> Double -> Double
 197 trunc' n x = fromIntegral $ truncate $ (x * 10^n)
 198
 199
 200 ------------------------------------------------------------------------
 201 bool2num :: Num a => Bool -> a
 202 bool2num True  = 1
 203 bool2num False = 0
 204
 205 bool2double :: Bool -> Double
 206 bool2double = bool2num
 207
 208 bool2int :: Bool -> Int
 209 bool2int = bool2num
 210 ------------------------------------------------------------------------
 211
 212 -- Normalizing && scaling data
 213 scale :: [Double] -> [Double]
 214 scale = scaleMinMax
 215
 216 scaleMinMax :: [Double] -> [Double]
 217 scaleMinMax xs = map (\x -> (x - mi / (ma - mi + 1) )) xs'
 218     where
 219         ma  = maximum xs'
 220         mi  = minimum xs'
 221         xs' = map abs xs
 222
 223 scaleNormalize :: [Double] -> [Double]
 224 scaleNormalize xs = map (\x -> (x - v / (m + 1))) xs'
 225     where
 226         v = variance xs'
 227         m = mean     xs'
 228         xs' = map abs xs
 229
 230 normalize :: [Double] -> [Double]
 231 normalize as = normalizeWith identity as
 232
 233 normalizeWith :: Fractional b => (a -> b) -> [a] -> [b]
 234 normalizeWith extract bs = map (\x -> x/(sum bs')) bs'
 235     where
 236         bs' = map extract bs
 237
 238 -- Zip functions to add
 239 zipFst :: ([b] -> [a]) -> [b] -> [(a, b)]
 240 zipFst  f xs = zip (f xs) xs
 241
 242 zipSnd :: ([a] -> [b]) -> [a] -> [(a, b)]
 243 zipSnd f xs = zip xs (f xs)
 244
 245 -- | maximumWith
 246 maximumWith :: (Ord a1, Foldable t) => (a2 -> a1) -> t a2 -> a2
 247 maximumWith f = L.maximumBy (compare `on` f)
 248