[Major] Separate plotting dependencies to enable running without plotting

neuralprophet/plot_forecast_plotly.py

@@ -2,8 +2,17 @@
 
 import numpy as np
 import pandas as pd
-import plotly.express as px
-import plotly.graph_objs as go
+
+try:
+    import plotly.express as px
+    import plotly.graph_objs as go
+
+    plotly_installed = True
+except ImportError:
+    from neuralprophet.plot_utils import show_import_error_warning
+
+    plotly_installed = False
+    show_import_error_warning("plotly")
 
 from neuralprophet.plot_model_parameters_plotly import get_dynamic_axis_range
 from neuralprophet.plot_utils import set_y_as_percent
@@ -19,30 +28,31 @@
     plotly_resampler_installed = False
     log.error("Importing plotly failed. Interactive plots will not work.")
 
-# UI Configuration
-prediction_color = "#2d92ff"
-actual_color = "black"
-trend_color = "#B23B00"
-line_width = 2
-marker_size = 4
-xaxis_args = {
-    "showline": True,
-    "mirror": True,
-    "linewidth": 1.5,
-}
-yaxis_args = {
-    "showline": True,
-    "mirror": True,
-    "linewidth": 1.5,
-}
-layout_args = {
-    "autosize": True,
-    "template": "plotly_white",
-    "margin": go.layout.Margin(l=0, r=10, b=0, t=10, pad=0),
-    "font": dict(size=10),
-    "title": dict(font=dict(size=12)),
-    "hovermode": "x unified",
-}
+if plotly_installed:
+    # UI Configuration
+    prediction_color = "#2d92ff"
+    actual_color = "black"
+    trend_color = "#B23B00"
+    line_width = 2
+    marker_size = 4
+    xaxis_args = {
+        "showline": True,
+        "mirror": True,
+        "linewidth": 1.5,
+    }
+    yaxis_args = {
+        "showline": True,
+        "mirror": True,
+        "linewidth": 1.5,
+    }
+    layout_args = {
+        "autosize": True,
+        "template": "plotly_white",
+        "margin": go.layout.Margin(l=0, r=10, b=0, t=10, pad=0),
+        "font": dict(size=10),
+        "title": dict(font=dict(size=12)),
+        "hovermode": "x unified",
+    }
 
 
 def plot(

neuralprophet/plot_model_parameters_plotly.py

@@ -3,8 +3,18 @@
 
 import numpy as np
 import pandas as pd
-import plotly.graph_objs as go
-from plotly.subplots import make_subplots
+
+try:
+    import plotly.express as px
+    import plotly.graph_objs as go
+
+    plotly_installed = True
+
+except ImportError:
+    from neuralprophet.plot_utils import show_import_error_warning
+
+    plotly_installed = False
+    show_import_error_warning("plotly")
 
 from neuralprophet.plot_utils import predict_one_season, predict_season_from_dates
 
@@ -18,26 +28,29 @@
     plotly_resampler_installed = False
     log.error("Importing plotly failed. Interactive plots will not work.")
 
-# UI Configuration
-color = "#2d92ff"
-xaxis_args = {
-    "showline": True,
-    "mirror": True,
-    "linewidth": 1.5,
-}
-yaxis_args = {
-    "showline": True,
-    "mirror": True,
-    "linewidth": 1.5,
-}
-layout_args = {
-    "autosize": True,
-    "template": "plotly_white",
-    "margin": go.layout.Margin(l=0, r=10, b=0, t=10, pad=0),
-    "font": dict(size=10),
-    "title": dict(font=dict(size=12)),
-    "hovermode": "x unified",
-}
+
+if plotly_installed:
+    # UI Configuration
+    color = "#2d92ff"
+    xaxis_args = {
+        "showline": True,
+        "mirror": True,
+        "linewidth": 1.5,
+    }
+    yaxis_args = {
+        "showline": True,
+        "mirror": True,
+        "linewidth": 1.5,
+    }
+    layout_args = {
+        "autosize": True,
+        "template": "plotly_white",
+        "margin": go.layout.Margin(l=0, r=10, b=0, t=10, pad=0),
+        "font": dict(size=10),
+        "title": dict(font=dict(size=12)),
+        "hovermode": "x unified",
+    }
+
 if plotly_resampler_installed:
     register_plotly_resampler(mode="auto")
 

neuralprophet/plot_utils.py

@@ -581,7 +581,10 @@ def validate_current_env_for_resampler(auto: bool = False) -> Optional[bool]:
         the code and the function did not switch to a valid environment.
     """
 
-    from IPython import get_ipython
+    try:
+        from IPython import get_ipython
+    except ImportError:
+        return None  # TODO not entirely sure if that is the correct behavior to simply return None here @Oscar?
 
     if "google.colab" in str(get_ipython()):
         if auto:
@@ -627,6 +630,7 @@ def is_notebook():
 def select_plotting_backend(model, plotting_backend):
     """Automatically selects the plotting backend based on the global plotting_backend and plotting_backend set by the
     user. If the plotting backend is selected as "plotly-resampler", triggers warning message.
+        If the plotting backend is not installed, triggers warning message and returns "no-backend-installed".
 
     Parameters
     ----------
@@ -652,4 +656,48 @@ def select_plotting_backend(model, plotting_backend):
                 plotting_backend = "plotly"
         elif plotting_backend == "plotly-resampler":
             validate_current_env_for_resampler()
-    return plotting_backend.lower()
+    return validate_plotting_backend_installed(
+        plotting_backend.lower()
+    )  # in case plotting backend is not installed, return None
+
+
+def show_import_error_warning(module_name: str):
+    """
+    Raise a warning if a module is not installed.
+
+    Parameters
+    ----------
+    module_name: str
+        The name of the module that is not installed.
+    """
+    logging.warning(f"{module_name} not installed. Plotting will not work.")
+    warnings.warn(
+        f"{module_name} not installed. Plotting will not work."
+        "This might be due to you running with poetry in minimal mode."
+        "Use `poety install --with plotting` to install."
+    )
+
+
+def validate_plotting_backend_installed(plotting_backend: str):
+    """
+    Validate if the plotting backend is installed.
+
+    Parameters
+    ----------
+    plotting_backend: str
+        The plotting backend to validate.
+    """
+    if plotting_backend.startswith("plotly"):
+        try:
+            import plotly.graph_objects as go
+        except ImportError:
+            show_import_error_warning("plotly")
+        return "no-backend-installed"
+    elif plotting_backend == "matplotlib":
+        try:
+            import matplotlib.pyplot as plt
+        except ImportError:
+            show_import_error_warning("matplotlib")
+        return "no-backend-installed"
+    else:
+        return plotting_backend

neuralprophet/uncertainty.py

@@ -277,6 +277,8 @@ def plot(self, plotting_backend=None):
             else:
                 fig = plot_interval_width_per_timestep_plotly(self.q_hats, method, resampler_active=False)
             fig.show()
+        elif plotting_backend == "no-backend-installed":
+            return None
         else:
             if self.n_forecasts == 1:
                 # includes nonconformity scores of the first timestep