[Dy2stat] Add Support for paddle.grad #33110
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Aurelius84
reviewed
Jun 4, 2021
| def forward(self, inputs): | ||
| in_vars, out_vars, tmp_scope_vec = self._prepare(inputs) | ||
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| double_grads = self._get_double_grads(self._origin_main_program) |
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这里的main_program是固定的，所以 double_grads 是否只需要 core.VarBase 创建一次就可以了，每个batch 直接复用就好了？
因为这个 get_double_grads放在forward里，调用频率会很高，grads_var的name解析等都是可以只做一次的。
python/paddle/fluid/dygraph/io.py
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| for b_idx in six.moves.range(program_desc.num_blocks()): | ||
| cur_block = program_desc.block(b_idx) | ||
| for var_idx, var in enumerate(cur_block.all_vars()): | ||
| name_old = var.name() | ||
| is_double_grad_var = "GRAD" in name_old |
| value=[1], | ||
| name='Fake_var', | ||
| place=framework._current_expected_place()) | ||
| ] |
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ddout在 Maker 里标记的是 AsDispensable，如果为空，这里是不是不用 fake 了？
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我尝试过，不管给DOut传None还是空list，都会报这个错：
看上去动态图还不好区分这种Dispensable，所以我模仿这里代码的valid_vars的写法。
Aurelius84
approved these changes
Jun 4, 2021
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This PR made these changes to support double grad:
paddle.gradtopaddle.static.gradientsto support double grad for dy2stat.DOutto support double grad variables inrun_program_opjit.save/load