(self, env, pixels_only=True, render_kwargs=None,
               observation_key='pixels')
Initializes a new pixel Wrapper.

    Args:
      env: The environment to wrap.
      pixels_only: If True (default), the original set of 'state' observations
        returned by the wrapped environment will be discarded, and the
        `OrderedDict` of observations will only contain pixels. If False, the
        `OrderedDict` will contain the original observations as well as the
        pixel observations.
      render_kwargs: Optional `dict` containing keyword arguments passed to the
        `mujoco.Physics.render` method.
      observation_key: Optional custom string specifying the pixel observation's
        key in the `OrderedDict` of observations. Defaults to 'pixels'.

    Raises:
      ValueError: If `env`'s observation spec is not compatible with the
        wrapper. Supported formats are a single array, or a dict of arrays.
      ValueError: If `env`'s observation already contains the specified
        `observation_key`.
Initializes a new pixel Wrapper.
Initializes a new pixel Wrapper .
def __init__(self, env, pixels_only=True, render_kwargs=None,
               observation_key='pixels'):
    """Initializes a new pixel Wrapper.

    Args:
      env: The environment to wrap.
      pixels_only: If True (default), the original set of 'state' observations
        returned by the wrapped environment will be discarded, and the
        `OrderedDict` of observations will only contain pixels. If False, the
        `OrderedDict` will contain the original observations as well as the
        pixel observations.
      render_kwargs: Optional `dict` containing keyword arguments passed to the
        `mujoco.Physics.render` method.
      observation_key: Optional custom string specifying the pixel observation's
        key in the `OrderedDict` of observations. Defaults to 'pixels'.

    Raises:
      ValueError: If `env`'s observation spec is not compatible with the
        wrapper. Supported formats are a single array, or a dict of arrays.
      ValueError: If `env`'s observation already contains the specified
        `observation_key`.
    """
    if render_kwargs is None:
      render_kwargs = {}

    wrapped_observation_spec = env.observation_spec()

    if isinstance(wrapped_observation_spec, specs.Array):
      self._observation_is_dict = False
      invalid_keys = set([STATE_KEY])
    elif isinstance(wrapped_observation_spec, collections.abc.MutableMapping):
      self._observation_is_dict = True
      invalid_keys = set(wrapped_observation_spec.keys())
    else:
      raise ValueError('Unsupported observation spec structure.')

    if not pixels_only and observation_key in invalid_keys:
      raise ValueError('Duplicate or reserved observation key {!r}.'
                       .format(observation_key))

    if pixels_only:
      self._observation_spec = collections.OrderedDict()
    elif self._observation_is_dict:
      self._observation_spec = wrapped_observation_spec.copy()
    else:
      self._observation_spec = collections.OrderedDict()
      self._observation_spec[STATE_KEY] = wrapped_observation_spec

    # Extend observation spec.
    pixels = env.physics.render(**render_kwargs)
    pixels_spec = specs.Array(
        shape=pixels.shape, dtype=pixels.dtype, name=observation_key)
    self._observation_spec[observation_key] = pixels_spec

    self._env = env
    self._pixels_only = pixels_only
    self._render_kwargs = render_kwargs
    self._observation_key = observation_key
def __init__ ( self , env , pixels_only = True , render_kwargs = None , observation_key = 'pixels' ) : if render_kwargs is None : render_kwargs = { } wrapped_observation_spec = env . observation_spec ( ) if isinstance ( wrapped_observation_spec , specs . Array ) : self . _observation_is_dict = False invalid_keys = set ( [ STATE_KEY ] ) elif isinstance ( wrapped_observation_spec , collections . abc . MutableMapping ) : self . _observation_is_dict = True invalid_keys = set ( wrapped_observation_spec . keys ( ) ) else : raise ValueError ( 'Unsupported observation spec structure.' ) if not pixels_only and observation_key in invalid_keys : raise ValueError ( 'Duplicate or reserved observation key {!r}.' . format ( observation_key ) ) if pixels_only : self . _observation_spec = collections . OrderedDict ( ) elif self . _observation_is_dict : self . _observation_spec = wrapped_observation_spec . copy ( ) else : self . _observation_spec = collections . OrderedDict ( ) self . _observation_spec [ STATE_KEY ] = wrapped_observation_spec # Extend observation spec. pixels = env . physics . render ( * * render_kwargs ) pixels_spec = specs . Array ( shape = pixels . shape , dtype = pixels . dtype , name = observation_key ) self . _observation_spec [ observation_key ] = pixels_spec self . _env = env self . _pixels_only = pixels_only self . _render_kwargs = render_kwargs self . _observation_key = observation_key