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mish activation test #13439

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mish activation test #13439

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18 changes: 17 additions & 1 deletion tests/keras/activations_test.py
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Original file line number Diff line number Diff line change
Expand Up @@ -118,7 +118,6 @@ def softplus(x):
expected = softplus(test_values)
assert_allclose(result, expected, rtol=1e-05)


def test_softsign():
"""Test using a reference softsign implementation.
"""
Expand Down Expand Up @@ -153,6 +152,23 @@ def ref_sigmoid(x):
expected = sigmoid(test_values)
assert_allclose(result, expected, rtol=1e-05)

def test_mish():
"""Test mish implementation.
"""
def ref_mish(x):
softplus = np.log(np.ones_like(x) + np.exp(x))
tanh_softplus_x = (np.exp(softplus) - np.exp(-softplus))/(np.exp(softplus) + np.exp(-softplus))
return x*tanh_softplus_x

mish = np.vectorize(ref_mish)

x = K.placeholder(ndim=2)
f = K.function([x], [activations.mish(x)])
test_values = get_standard_values()

result = f([test_values])[0]
expected = mish(test_values)
assert_allclose(result, expected, rtol=1e-05)

def test_hard_sigmoid():
"""Test using a reference hard sigmoid implementation.
Expand Down