Created
October 17, 2018 15:58
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class DecisionTree(): | |
def __init__(self, x, y, idxs=None, min_leaf=5, depth = 10): | |
if idxs is None: idxs=np.arange(len(y)) #bagging with all the rows | |
self.x, self.y, self.idxs, self.min_leaf, self.depth = x, y, idxs, min_leaf, depth | |
self.n, self.c = len(idxs), x.shape[1] | |
self.val = np.mean(y[idxs]) | |
self.score = float('inf') | |
self.find_varsplit() | |
# This just does one decision; we'll make it recursive later | |
def find_varsplit(self): | |
for i in range(self.c): self.find_better_split(i) | |
# We'll write this later! | |
def find_better_split(self, var_idx): pass | |
@property | |
def split_name(self): return self.x.columns[self.var_idx] | |
@property | |
def split_col(self): return self.x.values[self.idxs,self.var_idx] | |
@property | |
def is_leaf(self): return self.score == float('inf') | |
def __repr__(self): | |
s = f'n: {self.n}; val:{self.val}' | |
if not self.is_leaf: | |
s += f'; score:{self.score}; split:{self.split}; var:{self.split_name}' | |
return s |
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