Working on SDC-impl.
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@ -37,16 +37,16 @@ class Strength(Enum):
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class ParametrizationType(Enum):
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CHOL = 0
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ARCHAKOVA = 1
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CHOL = 1
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ARCHAKOVA = 2
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class EnforcePositiveType(Enum):
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LOG = 0
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RELU = 1
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SELU = 2
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ABS = 3
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SQ = 4
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LOG = 1
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RELU = 2
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SELU = 3
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ABS = 4
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SQ = 5
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class UniversalGaussianDistribution(SB3_Distribution):
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@ -60,8 +60,10 @@ class UniversalGaussianDistribution(SB3_Distribution):
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super(UniversalGaussianDistribution, self).__init__()
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self.par_strength = Strength.DIAG
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self.cov_strength = Strength.DIAG
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self.par_type = None
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self.enforce_positive_type = None
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self.par_type = ParametrizationType.CHOL
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self.enforce_positive_type = EnforcePositiveType.LOG
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self.distribution = None
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def proba_distribution_net(self, latent_dim: int, log_std_init: float = 0.0) -> Tuple[nn.Module, nn.Parameter]:
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"""
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@ -74,264 +76,66 @@ class UniversalGaussianDistribution(SB3_Distribution):
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:return:
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"""
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mean_actions = nn.Linear(latent_dim, self.action_dim)
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if self.contextual_cov:
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log_std = nn.Linear(latent_dim, self.action_dim)
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if self.par_strength == Strength.NONE:
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if self.cov_strength == Strength.NONE:
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pseudo_cov = th.ones(self.action_dim) * log_std_init
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elif self.cov_strength == Strength.SCALAR:
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pseudo_cov = th.ones(self.action_dim) * \
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nn.Parameter(log_std_init, requires_grad=True)
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elif self.cov_strength == Strength.DIAG:
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pseudo_cov = nn.Parameter(
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th.ones(self.action_dim) * log_std_init, requires_grad=True)
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elif self.cov_strength == Strength.FULL:
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# Off-axis init?
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pseudo_cov = nn.Parameter(
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th.diag_embed(th.ones(self.action_dim) * log_std_init), requires_grad=True)
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elif self.par_strength == self.cov_strength:
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if self.par_strength == Strength.NONE:
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pseudo_cov = th.ones(self.action_dim)
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elif self.par_strength == Strength.SCALAR:
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std = nn.Linear(latent_dim, 1)
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pseudo_cov = th.ones(self.action_dim) * std
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elif self.par_strength == Strength.DIAG:
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pseudo_cov = nn.Linear(latent_dim, self.action_dim)
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elif self.par_strength == Strength.FULL:
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raise Exception("Don't know how to implement yet...")
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elif self.par_strength > self.cov_strength:
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raise Exception(
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'The parameterization can not be stronger than the actual covariance.')
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else:
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log_std = nn.Parameter(
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th.ones(self.action_dim) * log_std_init, requires_grad=True)
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return mean_actions, log_std
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if self.par_strength == Strength.SCALAR and self.cov_strength == Strength.DIAG:
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factor = nn.Linear(latent_dim, 1)
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par_cov = th.ones(self.action_dim) * \
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nn.Parameter(1, requires_grad=True)
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pseudo_cov = par_cov * factor[0]
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elif self.par_strength == Strength.SCALAR and self.cov_strength == Strength.FULL:
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raise Exception(
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'That does not even make any sense...')
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else:
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raise Exception(
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'Programmer-was-to-lazy-to-implement-this-Exception')
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def proba_distribution(self, mean_actions: th.Tensor, log_std: th.Tensor) -> "DiagGaussianDistribution":
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return mean_actions, pseudo_cov
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def proba_distribution(self, mean_actions: th.Tensor, pseudo_cov: th.Tensor) -> "UniversalGaussianDistribution":
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"""
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Create the distribution given its parameters (mean, std)
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Create the distribution given its parameters (mean, pseudo_cov)
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:param mean_actions:
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:param log_std:
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:param pseudo_cov:
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:return:
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"""
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action_std = th.ones_like(mean_actions) * log_std.exp()
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self.distribution = Normal(mean_actions, action_std)
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return self
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def log_prob(self, actions: th.Tensor) -> th.Tensor:
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"""
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Get the log probabilities of actions according to the distribution.
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Note that you must first call the ``proba_distribution()`` method.
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:param actions:
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:return:
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"""
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log_prob = self.distribution.log_prob(actions)
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return sum_independent_dims(log_prob)
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def entropy(self) -> th.Tensor:
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return sum_independent_dims(self.distribution.entropy())
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def sample(self) -> th.Tensor:
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# Reparametrization trick to pass gradients
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return self.distribution.rsample()
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def mode(self) -> th.Tensor:
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return self.distribution.mean
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def actions_from_params(self, mean_actions: th.Tensor, log_std: th.Tensor, deterministic: bool = False) -> th.Tensor:
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# Update the proba distribution
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self.proba_distribution(mean_actions, log_std)
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return self.get_actions(deterministic=deterministic)
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def log_prob_from_params(self, mean_actions: th.Tensor, log_std: th.Tensor) -> Tuple[th.Tensor, th.Tensor]:
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"""
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Compute the log probability of taking an action
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given the distribution parameters.
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:param mean_actions:
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:param log_std:
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:return:
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"""
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actions = self.actions_from_params(mean_actions, log_std)
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log_prob = self.log_prob(actions)
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return actions, log_prob
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class DiagGaussianDistribution(SB3_Distribution):
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"""
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Gaussian distribution with full covariance matrix, for continuous actions.
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:param action_dim: Dimension of the action space.
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"""
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def __init__(self, action_dim: int):
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super(DiagGaussianDistribution, self).__init__()
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self.action_dim = action_dim
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self.mean_actions = None
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self.log_std = None
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def proba_distribution_net(self, latent_dim: int, log_std_init: float = 0.0) -> Tuple[nn.Module, nn.Parameter]:
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"""
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Create the layers and parameter that represent the distribution:
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one output will be the mean of the Gaussian, the other parameter will be the
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standard deviation (log std in fact to allow negative values)
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:param latent_dim: Dimension of the last layer of the policy (before the action layer)
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:param log_std_init: Initial value for the log standard deviation
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:return:
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"""
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mean_actions = nn.Linear(latent_dim, self.action_dim)
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# TODO: allow action dependent std
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log_std = nn.Parameter(th.ones(self.action_dim)
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* log_std_init, requires_grad=True)
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return mean_actions, log_std
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def proba_distribution(self, mean_actions: th.Tensor, log_std: th.Tensor) -> "DiagGaussianDistribution":
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"""
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Create the distribution given its parameters (mean, std)
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:param mean_actions:
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:param log_std:
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:return:
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"""
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action_std = th.ones_like(mean_actions) * log_std.exp()
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self.distribution = Normal(mean_actions, action_std)
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return self
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def log_prob(self, actions: th.Tensor) -> th.Tensor:
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"""
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Get the log probabilities of actions according to the distribution.
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Note that you must first call the ``proba_distribution()`` method.
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:param actions:
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:return:
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"""
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log_prob = self.distribution.log_prob(actions)
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return sum_independent_dims(log_prob)
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def entropy(self) -> th.Tensor:
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return sum_independent_dims(self.distribution.entropy())
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def sample(self) -> th.Tensor:
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# Reparametrization trick to pass gradients
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return self.distribution.rsample()
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def mode(self) -> th.Tensor:
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return self.distribution.mean
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def actions_from_params(self, mean_actions: th.Tensor, log_std: th.Tensor, deterministic: bool = False) -> th.Tensor:
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# Update the proba distribution
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self.proba_distribution(mean_actions, log_std)
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return self.get_actions(deterministic=deterministic)
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def log_prob_from_params(self, mean_actions: th.Tensor, log_std: th.Tensor) -> Tuple[th.Tensor, th.Tensor]:
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"""
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Compute the log probability of taking an action
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given the distribution parameters.
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:param mean_actions:
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:param log_std:
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:return:
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"""
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actions = self.actions_from_params(mean_actions, log_std)
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log_prob = self.log_prob(actions)
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return actions, log_prob
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class ContextualSqrtInducedCovDiagonalGaussianDistribution(DiagGaussianDistribution):
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"""
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Gaussian distribution induced by its sqrt(cov), for continuous actions.
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:param action_dim: Dimension of the action space.
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"""
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def __init__(self, action_dim: int):
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super(DiagGaussianDistribution, self).__init__()
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self.action_dim = action_dim
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self.mean_actions = None
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self.log_std = None
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def proba_distribution_net(self, latent_dim: int, log_std_init: float = 0.0) -> Tuple[nn.Module, nn.Parameter]:
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"""
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Create the layers and parameter that represent the distribution:
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one output will be the mean of the Gaussian, the other parameter will be the
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standard deviation (log std in fact to allow negative values)
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:param latent_dim: Dimension of the last layer of the policy (before the action layer)
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:param log_std_init: Initial value for the log standard deviation
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:return:
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"""
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mean_actions = nn.Linear(latent_dim, self.action_dim)
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log_std = nn.Linear(latent_dim, (self.action_dim, self.action_dim))
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return mean_actions, log_std
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def proba_distribution(self, mean_actions: th.Tensor, log_std: th.Tensor) -> "DiagGaussianDistribution":
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"""
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Create the distribution given its parameters (mean, std)
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:param mean_actions:
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:param log_std:
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:return:
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"""
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action_std = th.ones_like(mean_actions) * log_std.exp()
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self.distribution = Normal(mean_actions, action_std)
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return self
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def log_prob(self, actions: th.Tensor) -> th.Tensor:
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"""
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Get the log probabilities of actions according to the distribution.
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Note that you must first call the ``proba_distribution()`` method.
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:param actions:
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:return:
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"""
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log_prob = self.distribution.log_prob(actions)
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return sum_independent_dims(log_prob)
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def entropy(self) -> th.Tensor:
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return sum_independent_dims(self.distribution.entropy())
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def sample(self) -> th.Tensor:
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# Reparametrization trick to pass gradients
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return self.distribution.rsample()
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def mode(self) -> th.Tensor:
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return self.distribution.mean
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def actions_from_params(self, mean_actions: th.Tensor, log_std: th.Tensor, deterministic: bool = False) -> th.Tensor:
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# Update the proba distribution
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self.proba_distribution(mean_actions, log_std)
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return self.get_actions(deterministic=deterministic)
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def log_prob_from_params(self, mean_actions: th.Tensor, log_std: th.Tensor) -> Tuple[th.Tensor, th.Tensor]:
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"""
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Compute the log probability of taking an action
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given the distribution parameters.
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:param mean_actions:
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:param log_std:
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:return:
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"""
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actions = self.actions_from_params(mean_actions, log_std)
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log_prob = self.log_prob(actions)
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return actions, log_prob
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class DiagGaussianDistribution(SB3_Distribution):
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"""
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Gaussian distribution with full covariance matrix, for continuous actions.
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:param action_dim: Dimension of the action space.
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"""
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def __init__(self, action_dim: int):
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super(DiagGaussianDistribution, self).__init__()
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self.action_dim = action_dim
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self.mean_actions = None
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self.log_std = None
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def proba_distribution_net(self, latent_dim: int, log_std_init: float = 0.0) -> Tuple[nn.Module, nn.Parameter]:
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"""
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Create the layers and parameter that represent the distribution:
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one output will be the mean of the Gaussian, the other parameter will be the
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standard deviation (log std in fact to allow negative values)
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:param latent_dim: Dimension of the last layer of the policy (before the action layer)
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:param log_std_init: Initial value for the log standard deviation
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:return:
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"""
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mean_actions = nn.Linear(latent_dim, self.action_dim)
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# TODO: allow action dependent std
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log_std = nn.Parameter(th.ones(self.action_dim)
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* log_std_init, requires_grad=True)
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return mean_actions, log_std
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def proba_distribution(self, mean_actions: th.Tensor, log_std: th.Tensor) -> "DiagGaussianDistribution":
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"""
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Create the distribution given its parameters (mean, std)
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:param mean_actions:
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:param log_std:
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:return:
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"""
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action_std = th.ones_like(mean_actions) * log_std.exp()
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self.distribution = Normal(mean_actions, action_std)
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action_std = None
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# TODO: Needs to be expanded
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if self.cov_strength == Strength.DIAG:
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if self.enforce_positive_type == EnforcePositiveType.LOG:
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action_std = pseudo_cov.exp()
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if action_std == None:
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raise Exception('Not yet implemented!')
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self.distribution = Normal(mean_actions, action_std)
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if self.distribution == None:
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raise Exception('Not yet implemented!')
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return self
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def log_prob(self, actions: th.Tensor) -> th.Tensor:
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