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60d4d5e1aa
* Remove all __future__ imports from RLlib. * Remove (object) again from tf_run_builder.py::TFRunBuilder. * Fix 2xLINT warnings. * Fix broken appo_policy import (must be appo_tf_policy) * Remove future imports from all other ray files (not just RLlib). * Remove future imports from all other ray files (not just RLlib). * Remove future import blocks that contain `unicode_literals` as well. Revert appo_tf_policy.py to appo_policy.py (belongs to another PR). * Add two empty lines before Schedule class. * Put back __future__ imports into determine_tests_to_run.py. Fails otherwise on a py2/print related error.
15 lines
493 B
Python
15 lines
493 B
Python
from ray.rllib.utils import try_import_tf, try_import_torch
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tf = try_import_tf()
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torch, nn = try_import_torch()
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def explained_variance(y, pred, framework="tf"):
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if framework == "tf":
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_, y_var = tf.nn.moments(y, axes=[0])
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_, diff_var = tf.nn.moments(y - pred, axes=[0])
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return tf.maximum(-1.0, 1 - (diff_var / y_var))
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else:
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y_var = torch.var(y, dim=[0])
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diff_var = torch.var(y - pred, dim=[0])
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return max(-1.0, 1 - (diff_var / y_var))
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