Use conda for all dependencies. (#861)

* Use conda for all dependencies.

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* revert.

* Bring back the condition.

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

scripts/generate-conda-envs.py

@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 
-# Copyright (c) 2020-2022, NVIDIA CORPORATION. All rights reserved.
+# Copyright (c) 2020-2023, NVIDIA CORPORATION. All rights reserved.
 #
 # NVIDIA CORPORATION and its licensors retain all intellectual property
 # and proprietary rights in and to this software, related documentation
@@ -193,11 +193,12 @@ def conda(self) -> Reqs:
             "pytest",
             "types-docutils",
             "pynvml",
+            "tifffile",
         )
 
     @property
     def pip(self) -> Reqs:
-        return ("tifffile",)
+        return ()
 
 
 @dataclass(frozen=True)
@@ -206,11 +207,9 @@ class DocsConfig(SectionConfig):
 
     @property
     def conda(self) -> Reqs:
-        return ("pandoc", "doxygen")
-
-    @property
-    def pip(self) -> Reqs:
         return (
+            "pandoc",
+            "doxygen",
             "ipython",
             "jinja2",
             "markdown<3.4.0",
@@ -221,6 +220,10 @@ def pip(self) -> Reqs:
             "sphinx>=4.4.0",
         )
 
+    @property
+    def pip(self) -> Reqs:
+        return ()
+
 
 @dataclass(frozen=True)
 class EnvConfig:
@@ -485,7 +488,9 @@ def section_selected(section):
             use=config.use,
             python=config.python,
             conda_sections=conda_sections,
-            pip=PIP_TEMPLATE.format(pip_sections=pip_sections),
+            pip=PIP_TEMPLATE.format(pip_sections=pip_sections)
+            if pip_sections
+            else "",
         )
         with open(f"{filename}.yaml", "w") as f:
             f.write(out)