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99 lines
3.1 KiB
99 lines
3.1 KiB
4 years ago
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import torch
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from typing import Optional, Tuple, Dict
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from .device_env import DeviceEnv
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from .metric import Metric, ValueInfo
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class Accuracy(Metric):
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def __init__(self, threshold=0.5, multi_label=False, dev_env=None):
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super().__init__(dev_env=dev_env)
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self.threshold = threshold
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self.eps = 1e-8
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self.multi_label = multi_label
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# statistics / counts
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self._register_value('correct')
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self._register_value('total')
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def _update(self, predictions, target):
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raise NotImplemented()
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def _compute(self):
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raise NotImplemented()
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# class AccuracyTopK(torch.nn.Module):
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#
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# def __init__(self, topk=(1, 5), device=None):
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# super().__init__()
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# self.eps = 1e-8
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# self.device = device
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# self.topk = topk
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# self.maxk = max(topk)
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# # FIXME handle distributed operation
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#
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# # statistics / counts
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# self.reset()
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#
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# def update(self, predictions: torch.Tensor, target: torch.Tensor):
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# sorted_indices = predictions.topk(self.maxk, dim=1)[1]
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# sorted_indices.t_()
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# correct = sorted_indices.eq(target.reshape(1, -1).expand_as(sorted_indices))
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#
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# batch_size = target.shape[0]
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# correct_k = {k: correct[:k].reshape(-1).float().sum(0) for k in self.topk}
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# for k, v in correct_k.items():
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# attr = f'_correct_top{k}'
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# old_v = getattr(self, attr)
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# setattr(self, attr, old_v + v)
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# self._total_sum += batch_size
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#
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# def reset(self):
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# for k in self.topk:
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# setattr(self, f'_correct_top{k}', torch.tensor(0, dtype=torch.float32))
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# self._total_sum = torch.tensor(0, dtype=torch.float32)
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#
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# @property
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# def counts(self):
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# pass
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#
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# def compute(self) -> Dict[str, torch.Tensor]:
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# # FIXME handle distributed reduction
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# return {f'top{k}': 100 * getattr(self, f'_correct_top{k}') / self._total_sum for k in self.topk}
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class AccuracyTopK(Metric):
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def __init__(self, topk=(1, 5), dev_env: DeviceEnv = None):
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super().__init__(dev_env=dev_env)
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self.eps = 1e-8
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self.topk = topk
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self.maxk = max(topk)
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# statistics / counts
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for k in self.topk:
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self._register_value(f'top{k}')
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self._register_value('total')
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self.reset()
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def _update(self, predictions: torch.Tensor, target: torch.Tensor):
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batch_size = predictions.shape[0]
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sorted_indices = predictions.topk(self.maxk, dim=1)[1]
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target_reshape = target.reshape(-1, 1).expand_as(sorted_indices)
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correct = sorted_indices.eq(target_reshape).float().sum(0)
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for k in self.topk:
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attr_name = f'top{k}'
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correct_at_k = correct[:k].sum()
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setattr(self, attr_name, getattr(self, attr_name) + correct_at_k)
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self.total += batch_size
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def _compute(self) -> Dict[str, torch.Tensor]:
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assert self.total is not None
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output = {}
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for k in self.topk:
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attr_name = f'top{k}'
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output[attr_name] = 100 * getattr(self, attr_name) / self.total
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return output
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