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Merge pull request #101 from antinucleon/master
Draft model
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Original file line number | Diff line number | Diff line change |
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# pylint: skip-file | ||
import numpy as np | ||
from .ndarray import NDArray | ||
from . import random | ||
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class Initializer(object): | ||
"""Base class for Initializer""" | ||
def __init__(self, **kwargs): | ||
"""Constructor | ||
Parameters | ||
---------- | ||
kwargs: dict | ||
potential parameters for Initializer implmentation | ||
""" | ||
self.args = kwargs | ||
|
||
def init_weight(self): | ||
"""Abstruct method to Initialize weight""" | ||
raise NotImplementedError("Must override it") | ||
|
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def __call__(self, state, arr): | ||
"""Override () function to do Initialization | ||
Parameters: | ||
---------- | ||
state: str | ||
name of corrosponding ndarray | ||
arr: NDArray | ||
ndarray to be Initialized | ||
""" | ||
assert(isinstance(state, str)) | ||
assert(isinstance(arr, NDArray)) | ||
if "weight" in state: | ||
self.init_weight(arr) | ||
if "bias" in state: | ||
arr[:] = 0.0 | ||
if "gamma" in state: | ||
arr[:] = 1.0 | ||
if "beta" in state: | ||
arr[:] = 0.0 | ||
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||
def get_fan(self, shape): | ||
"""Get input/output from shape | ||
Parameter | ||
--------- | ||
shape: tuple | ||
shape of NDArray | ||
Returns | ||
------- | ||
fan_in: int | ||
input dim | ||
fan_out: int | ||
output dim | ||
""" | ||
fan_in = shape[1] | ||
fan_out = shape[0] | ||
return fan_in, fan_out | ||
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||
class Uniform(Initializer): | ||
"""Uniform Initializer""" | ||
def __init__(self, scale=0.07): | ||
"""Constructor | ||
Parameter | ||
--------- | ||
scale: float (default=0.07) | ||
unifrom range [-scale, scale] | ||
""" | ||
super().__init__(scale = scale) | ||
|
||
def init_weight(self, arr): | ||
"""Implmentation of abs method | ||
Parameter | ||
-------- | ||
arr: NDArray | ||
NDArray to be Initialized | ||
""" | ||
if isinstance(arr, NDArray): | ||
arr[:] = random.uniform(-scale, scale, arr.shape) | ||
else: | ||
raise TypeError("Input array must be NDArray") | ||
|
||
class Normal(Initializer): | ||
"""Gaussian Initializer""" | ||
def __init__(self, sigma=0.01): | ||
"""Constuctor of Normal Initializer | ||
Parameter | ||
-------- | ||
sigma: float (default=0.01) | ||
sigma for gaussian distribution | ||
""" | ||
super().__init__(sigma = sigma) | ||
def init_weight(self, arr): | ||
"""Implmentation of abs method | ||
Parameter | ||
-------- | ||
arr: NDArray | ||
NDArray to be Initialized | ||
""" | ||
if isinstance(arr, NDArray): | ||
arr[:] = random.normal(0, sigma, arr.shape) | ||
else: | ||
raise TypeError("Input array must be NDArray") | ||
|
||
class Xavier(Initializer): | ||
def init_weight(self, arr): | ||
"""Implmentation of abs method | ||
Parameter | ||
-------- | ||
arr: NDArray | ||
NDArray to be Initialized | ||
""" | ||
if isinstance(arr, NDArray): | ||
fan_in, fan_out = self.get_fan(arr.shape) | ||
s = np.sqrt(6. / (fan_in + fan_out)) | ||
arr[:] = random.uniform(-s, s, arr.shape) | ||
else: | ||
raise TypeError("Input array must be NDArray") |
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